Paediatrics · Full case

Childhood Limp

NICE NG12 · BSPARAge-based differentialSeptic · SUFE · cancer

Age frames the differential0–3y: DDH, septic arthritis, toddler's fracture, non-accidental injury. 3–10y: transient synovitis, septic arthritis, Perthes'. 10–16y: SUFE, septic arthritis, Perthes'. Septic arthritis & malignancy can occur at any age. Age narrows the list dramatically

Septic arthritis = emergencyA child who won't weight-bear or move the joint, with fever and systemic upset, has septic arthritis until proven otherwise — an emergency needing same-day assessment, joint aspiration and IV antibiotics. Kocher criteria (non-weight-bearing, fever >38.5 °C, ESR ≥40 mm/h, WCC >12 ×10⁹/L — Kocher 1999) help hospital teams separate it from transient synovitis; in primary care the decision to send is clinical and must not wait for bloods

The hip refers to the kneeA child with knee or thigh pain and a normal knee must have the HIP examined — SUFE and Perthes' classically present with knee/thigh pain. Missing this is the commonest, most dangerous error in the limping child

SUFE — don't miss itSlipped upper femoral epiphysis: typically an overweight adolescent (often around puberty), with hip/groin/thigh/knee pain, an externally rotated leg and limited internal rotation. Needs same-day orthopaedic assessment (suspect it in any child over about 9 with an acute limp and painful or restricted hip movement) and non-weight-bearing until seen — delay risks avascular necrosis. Can be bilateral

Transient synovitis is a diagnosis of exclusionThe commonest cause of acute hip pain in young children — often post-viral; the child is well, afebrile and weight-bearing, and improves over days. The accepted primary-care rule allows a provisional diagnosis only for a well, afebrile, weight-bearing child aged 3–9 with a limp of under 48 hours (the site uses 48 hours; CKS allows up to 72), reviewed at 48 hours. But it is diagnosed only after excluding septic arthritis; never assume it in a febrile, unwell, non-weight-bearing child

🟣 Persistent bone pain → leukaemiaNICE NG12: offer a very urgent FBC (within 48 h) for any one of persistent or unexplained bone pain, pallor, persistent fatigue, unexplained fever, unexplained persistent infection, generalised lymphadenopathy, or unexplained bruising or bleeding. Unexplained petechiae or hepatosplenomegaly → immediate specialist assessment. Unexplained bone pain or swelling → consider a very urgent X-ray (within 48 h) for bone sarcoma. Night pain & bone tenderness are clues

Think safeguardingAlways consider non-accidental injury — inconsistent or changing history, injury not matching development/mechanism, delayed presentation, other injuries, or a non-mobile child with a fracture. A limp can be the presentation of abuse

Other causesReactive/juvenile idiopathic arthritis, osteomyelitis, trauma/toddler's fracture, discitis, soft-tissue/foot causes, growing pains (bilateral, night, never limps by day, normal exam — a diagnosis of exclusion). Don't forget the foot, ankle and whole leg, and a full systemic look

📋 Clinical Stem — The Limping Child

A 13-year-old boy with a few weeks of "knee" pain and a limp, now worse, who is overweight and walks with his foot turned out — and whose knee examines completely normally

Kyle Morrison, 13, is brought by his mother with several weeks of right knee and thigh pain and a limp that has worsened over the past week, now making PE difficult. There was no clear injury. He is overweight for his age. He walks with an antalgic gait and the right leg appears externally rotated. When you examine the knee it is entirely normal — no swelling, full painless range. He is otherwise well, afebrile, with no rash, bruising, weight loss or night sweats, and no recent illness. His mother is frustrated that "it's just his knee" and wants a referral to physiotherapy.

This stem tests the single most important principle of the limping child — that the hip refers to the knee — and the recognition of slipped upper femoral epiphysis (SUFE): an overweight adolescent around puberty, with knee/thigh pain, an externally rotated leg, restricted internal rotation of the hip, and a normal knee. It requires the candidate to examine the HIP despite knee-presenting pain, to recognise SUFE as needing urgent orthopaedic referral and non-weight-bearing (to prevent avascular necrosis), and NOT to refer to physiotherapy or reassure as a knee problem. It also tests the broader age-based framework and the exclusion of the emergencies (septic arthritis, and the NG12 leukaemia red flags) and safeguarding. The SCA challenge is to redirect a parent fixated on "the knee" toward urgent hip assessment, and to convey the seriousness without alarm.

Scenario A — SUFE (this stem) Overweight adolescent, knee/thigh pain, externally rotated leg, restricted hip internal rotation, normal knee. Same-day orthopaedic assessment, non-weight-bearing, X-ray (AP pelvis + frog-lateral of both hips; cross-table lateral if unstable); avoid AVN; check the other hip.

Scenario B — Septic arthritis (EMERGENCY, any age) Won't weight-bear/move joint, fever, systemically unwell, raised inflammatory markers (Kocher). Same-day admission; aspiration + IV antibiotics.

Scenario C — Transient synovitis (3–10y) Well child, post-viral, low/no fever, improving; diagnosis of exclusion after ruling out sepsis. Provisional diagnosis only if aged 3–9, well, afebrile, weight-bearing, limp <48 h (the site uses 48 hours; CKS allows up to 72). Rest, analgesia, safety-net, review at 48 h.

Scenario D — Perthes' (3–10y) Insidious limp/hip-knee pain, restricted hip movement, often well. Orthopaedic referral; X-ray (avascular necrosis of the femoral head).

Scenario E — Red flags: leukaemia / DDH / NAI Persistent/unexplained bone pain or pallor/fatigue/fever/lymphadenopathy/bruising → very urgent FBC within 48 h; petechiae or hepatosplenomegaly → immediate specialist assessment (NICE NG12). Infant: DDH (asymmetry, limited abduction). Any: non-accidental injury — inconsistent history/other injuries.

Key variables to adapt for Age (DDH/septic/toddler's # → transient synovitis/Perthes' → SUFE); weight-bearing & systemic features (septic); hip refers to knee; SUFE in the overweight adolescent; persistent bone pain + systemic features (leukaemia, NG12); safeguarding/NAI; growing pains as exclusion; bilateral/other-hip involvement.

Steps:

Step 1

History — Age · Weight-Bearing & Systemic Features · Red Flags · Safeguarding · ICE

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The history is structured around age (which reshapes the differential), the two pivotal questions — is the child weight-bearing, and is the child systemically well? — and the red flags (septic arthritis, the NG12 leukaemia features, and safeguarding). The over-arching rule, which Kyle's case turns on, is that knee or thigh pain in a child demands assessment of the hip.

🎓 SCA framing — redirect "it's just his knee" to the hip

"I can see why you think it's his knee — that's where it hurts. But in children, hip problems very often show up as knee pain, so I'm going to examine his hip carefully too. That's important, because some hip conditions need treating quickly."

The parent (and the symptom) point at the knee. The skill is to explain, not dismiss, why the hip must be examined — and to act urgently if SUFE is found, rather than refer to physiotherapy.

1A — Age, weight-bearing, systemic features, red flags

Question	Why it matters	Bottom line	Changes what?
🟢 OPEN QUESTION"Tell me about the limp — when it started, where it hurts, and how it's changed."	Establishes onset, site and trajectory. Kyle's weeks of knee/thigh pain, worsening, no injury, in an overweight adolescent, with an out-turned leg, is a SUFE story — but it is masquerading as a knee problem. Acute vs insidious and the site guide the differential within the age band.In SCA: not accepting "knee pain" at face value, and reasoning by age, is the core skill.	Knee or thigh pain in a child = examine the hip until proven otherwise.	Adolescent + knee/thigh pain → examine hip (SUFE)
🚩 Weight-bearing & systemic features (septic)"Can he walk/bear weight on it? Any fever, or has he been unwell or off-colour? Does he let you move the leg?"	The emergency screen. A child who won't weight-bear or move the joint, with fever and systemic upset, has septic arthritis until proven otherwise — a same-day emergency. Kocher criteria (non-weight-bearing, fever >38.5 °C, ESR ≥40 mm/h, WCC >12 ×10⁹/L) help hospital teams separate it from transient synovitis. Kyle is afebrile and weight-bears (antalgic) — against sepsis, but still abnormal.	Won't weight-bear + fever/unwell → septic arthritis emergency.	Septic features → same-day admission
Age & the differential"How old is he, and is he otherwise developing normally?"	Age reshapes the list: infants/toddlers (DDH, septic, toddler's fracture, NAI); 3–10y (transient synovitis, septic, Perthes'); 10–16y (SUFE, septic, Perthes'). Kyle at 13 puts SUFE at the top. Always tailor to age.	Age band → the most likely diagnoses.	Age narrows the differential
🚩 Leukaemia / sinister bone-pain screen"Any pain at night, bone tenderness, tiredness, pallor, easy bruising, lumps in the neck/armpits, fevers, or weight loss?"	Any one of persistent or unexplained bone pain, pallor, persistent fatigue, unexplained fever, generalised lymphadenopathy, or unexplained bruising/bleeding warrants a very urgent FBC (within 48 h) for leukaemia; unexplained petechiae or hepatosplenomegaly warrant immediate specialist assessment (NICE NG12). Bone pain does not need to be accompanied by the other features. Night pain and bone tenderness are clues to malignancy. Kyle has none — reassuring, but the screen is mandatory.	Any NG12 feature (bone pain alone counts) → very urgent FBC; petechiae/hepatosplenomegaly → immediate specialist.	Leukaemia features → urgent FBC (NG12)
🚩 Trauma & safeguarding"Was there any injury, and does the story fit? Has this happened before? How did it happen exactly?"	Trauma may explain a fracture, but always consider non-accidental injury: a history that is inconsistent, changing, or doesn't fit the child's development/mechanism; delayed presentation; other injuries; or a non-mobile child with a fracture. A limp can be the presentation of abuse.	Inconsistent history/other injuries / non-mobile child + fracture → safeguarding.	Safeguarding concern → child-protection pathway
Preceding illness & course"Any recent cold, virus or sore throat? Is it getting better, worse or staying the same?"	A recent viral illness with a well child and improving course suggests transient synovitis (but only after excluding sepsis). A worsening or persistent course (Kyle) argues against transient synovitis and for a structural cause needing imaging/referral.	Post-viral + improving → ?transient synovitis (exclusion). Worsening/persistent → structural → image/refer.	Persistent → imaging/referral

1B — Red flags

🚨

Red Flags — the limping child you cannot miss

Red flag	Why dangerous	Action
Septic arthritis / osteomyelitis — won't weight-bear/move joint, fever, systemically unwell	Joint destruction within days; sepsis; an emergency at any age.	Same-day paediatric/orthopaedic admission; aspiration + IV antibiotics (Kocher to support)
SUFE — overweight adolescent, hip/thigh/knee pain, externally rotated leg, ↓ internal rotation	Delay causes avascular necrosis and permanent damage; can be bilateral. Acute limp over 9 with painful/restricted hip movement → urgent same-day assessment; hip X-ray AP pelvis + frog-lateral of both hips, or cross-table lateral if an unstable slip is suspected (Am Fam Physician 2017 SCFE review, international).	Same-day orthopaedics · non-weight-bearing
🟣 Leukaemia — persistent bone pain/limp + pallor, bruising/petechiae, hepatosplenomegaly, lymphadenopathy, fever, night pain	Haematological malignancy presenting as bone/joint pain. NICE NG12: any one feature (bone pain alone counts) → very urgent FBC within 48 h; unexplained petechiae or hepatosplenomegaly → immediate specialist assessment; unexplained bone pain/swelling → consider very urgent X-ray within 48 h (bone sarcoma).	Very urgent FBC ≤48 h · NG12
Non-accidental injury — inconsistent/changing history, other injuries, non-mobile child with fracture	Child protection.	Safeguarding assessment per local child-protection pathway
Perthes' / DDH — insidious limp, restricted hip movement (Perthes' 3–10y); infant asymmetry/limited abduction (DDH)	Femoral head/hip joint damage if missed.	Orthopaedic referral; hip X-ray/USS
Atraumatic limp under 3 / unable to localise	Young children localise poorly; serious causes (septic, NAI, malignancy) easily missed. Transient synovitis is rare under 3 and septic arthritis more common.	Same-day paediatric assessment

1C — ICE

💭 Ideas

"What do you think is causing it — and what were you hoping we'd do?"

Kyle's mother thinks it's a knee problem for physiotherapy. Surfacing this lets you explain, respectfully, why the hip must be examined and why a referral to physio would be the wrong move if this is SUFE — replacing her plan with a better one she understands.

😟 Concerns

"Has anything about it worried you, beyond the pain and the limp?"

She may worry about him missing school/sport, or (unspoken) something serious. Naming it lets you reassure appropriately while being honest that some hip conditions need urgent attention.

🎯 Expectations

"Let me explain what I've found and what needs to happen next."

She expects a physio referral. If SUFE is found, you must reframe to urgent hospital assessment and non-weight-bearing — clearly and calmly, so she understands the change of plan and its importance.

1D — Psychosocial context

A limping child frightens parents and pulls the clinician toward the site of the complaint. The limping child is a classic exam — and real-life — trap precisely because the dangerous diagnoses hide: SUFE behind "knee pain", septic arthritis behind a "viral limp", leukaemia behind "growing pains". The safe consultation resists premature reassurance, reasons by age, always examines the joint above and below (the hip for knee pain), screens the emergencies and red flags, and reframes the parent's expectations toward the right — sometimes urgent — pathway with clarity and care.

🦵 "It's just his knee"

Explain why the hip matters, without dismissing.

"You're right that the pain's in his knee — but in growing children the hip often sends its pain to the knee, so checking the hip is exactly how we avoid missing something important."

🏥 Reframing to urgent care

If SUFE, explain the change of plan calmly.

"From examining his hip, I'm concerned about a condition where the top of the thigh bone slips. It needs the hospital to see him urgently today, and he shouldn't put weight on that leg in the meantime — treating it quickly protects the hip."

🚫 Not physiotherapy

Explain why physio would be wrong here.

"I know you were hoping for physio, but if this is what I think, exercises could make it worse — this needs an orthopaedic surgeon, not physiotherapy, and quickly."

🛡️ Honest reassurance

Balance seriousness with calm.

"This is treatable, and we've caught it at the right time by checking properly. I'll arrange everything now and explain each step so you know what's happening."

1E — PMH · FH · Drug history · Social history: management impact

Area	What to ask and why it matters	Changes what?
Past medical history"Has he had any problems with his hips, joints or bones before? Any hormone or thyroid problems, kidney problems, or treatment with radiotherapy or steroids?"	Endocrine disorders (hypothyroidism, growth hormone treatment, hypogonadism), renal osteodystrophy and previous radiotherapy are recognised risk factors for SUFE, and an "atypical" SUFE (younger child, thin child, or under the usual age) should prompt thought about an underlying endocrine cause. A previous SUFE on the other side means the contralateral hip is at risk. Sickle cell disease changes the differential (bone infarct, osteomyelitis including Salmonella). Haemophilia makes a haemarthrosis likely.	Endocrine/renal history → atypical SUFE; sickle cell → infarct vs osteomyelitis
Birth & developmental history"Was he born by breech? Any hip checks as a baby? When did he start walking?"	Breech presentation, a first-degree family history and a positive newborn or 6–8-week hip check are DDH risk factors — relevant in the toddler with a new limp. Late walking or loss of skills raises neuromuscular causes (for example Duchenne muscular dystrophy in a boy with a waddling gait and calf hypertrophy) and cerebral palsy. For Kyle, the developmental history mainly frames him as a normally developing adolescent.	Toddler + DDH risk → hip USS/X-ray; motor delay → neuromuscular
Family history"Does anyone in the family have hip problems, arthritis, psoriasis, bowel inflammation, or bleeding problems?"	A family history of DDH or Perthes' raises prior probability; psoriasis, inflammatory bowel disease or HLA-B27-associated disease raises juvenile idiopathic arthritis (psoriatic or enthesitis-related); a bleeding disorder changes both the differential and the safeguarding interpretation of bruising. NICE CG89 is explicit that bruising should be interpreted only after a medical cause has been considered.	FH psoriasis/IBD → JIA; FH bleeding → clotting screen before labelling bruises
Drug history"Has he taken anything for the pain — how much, and did it help? Any other medicines, including steroids? Any antibiotics recently?"	Analgesia masks fever and pain; recent antibiotics can partially treat septic arthritis or osteomyelitis and blunt the picture (a "well-looking" child on amoxicillin for a sore throat still needs the hip examined). Long-term corticosteroids raise the risk of avascular necrosis. Ask about aspirin — it should not be given to under-16s (Reye's syndrome, children’s SPC).	Recent antibiotics → lower threshold for same-day assessment
Social history & safeguarding context"Who lives at home? Who looks after him? Is he known to any other services? How is school — PE, friends, any bullying?"	NICE CG89 asks clinicians to suspect maltreatment when an injury such as a fracture has an absent or unsuitable (implausible, inadequate or inconsistent) explanation, and gives particular weight to bruising and other soft-tissue or thermal injuries in children who are not independently mobile; unexplained delay in seeking help is a further recognised warning feature. Knowing household composition, carers, social-care involvement and school attendance lets you interpret the story. For an adolescent, weight-related bullying may be a hidden driver of avoidance of PE, and it matters for how you discuss weight later.	Unsuitable explanation → safeguarding lead / children's social care
Weight, activity & puberty"How has his weight been? Has he had a growth spurt recently? What sport does he do?"	Obesity is the strongest modifiable risk factor for SUFE and slips cluster around the pubertal growth spurt. Sport history separates overuse causes (Osgood-Schlatter at the tibial tuberosity, Sinding-Larsen-Johansson at the lower pole of the patella, Sever's at the heel) from hip pathology — but an active adolescent can have both. Record height and weight and plot BMI centile: it informs the SUFE risk now and the weight conversation later.	BMI centile high + pubertal → SUFE higher on the list

🎓 SCA Checkpoint — Step 1TasksRelating to OthersGlobal Skills

Key phrases that score

"In children, hip problems often show up as knee pain — so I'll examine his hip." — the central principle.

"Can he bear weight, and has he had any fever?" — the septic-arthritis screen.

"Any night pain, pallor, bruising, or lumps?" — the NG12 leukaemia screen.

Deductions

Examining only the knee; missing SUFE / not examining the hip
Not screening for septic arthritis (weight-bearing/fever) or leukaemia red flags
Referring to physiotherapy / reassuring as a knee problem
Not considering safeguarding / age-based differential

🔴 Red

Treats as a knee problem; no hip exam; SUFE missed; physio referral; no septic/leukaemia/safeguarding screen

🟠 Amber

Examines hip; suspects a hip cause; some red-flag screen; urgency/age framework partial; ICE partial

🟢 Green

Reasons by age; examines the hip for knee pain; recognises SUFE → urgent ortho + non-weight-bearing; screens septic/leukaemia/safeguarding; reframes parent; ICE all three

Step 2

Triage — Emergency (Septic/Leukaemia/NAI) · Urgent (SUFE/Perthes) · Routine

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Triage the limping child by danger: septic arthritis, suspected SUFE, any acute limp under 3, and safeguarding concerns are same-day; suspected leukaemia needs a very urgent FBC within 48 hours (immediate assessment if petechiae or hepatosplenomegaly); Perthes', DDH and JIA are urgent specialist referrals; transient synovitis and minor causes are managed/reviewed in primary care — but only once the emergencies are excluded. Kyle is in the same-day SUFE lane.

🔴 Emergency

Same day / 48 h

Don't delay

Septic arthritis / osteomyelitisWon't weight-bear + fever/unwell → admit
SUFE (suspected)Same-day orthopaedics; non-weight-bearing until seen (Kyle)
Acute limp under 3Same-day paediatric assessment
🟣 Suspected leukaemiaAny NG12 feature → very urgent FBC (48 h); petechiae/HSM → immediate
Safeguarding / NAIChild-protection pathway

🟠 Urgent

Orthopaedics

Days

JIA (suspected)Paediatric rheumatology — seen within 4 weeks of referral (BSPAR)
Perthes'Orthopaedic referral; X-ray
DDH (infant)Hip USS/X-ray; orthopaedics

🟢 Routine

Primary care

After exclusion

Transient synovitisWell child; rest/analgesia; safety-net; review
Minor trauma/soft-tissueConservative; review
Growing pains (exclusion)Reassure if classic & normal exam

🎓 SCA Checkpoint — Step 2Tasks

Triage rationale

"He's not feverish or systemically unwell, which is reassuring against infection — but the hip findings make me concerned about a slipped growth plate, which is an urgent orthopaedic problem, not a physio one."

Deductions

Routing SUFE to physiotherapy/routine care
Missing septic arthritis or leukaemia red flags

Step 3

Examination — Gait · The HIP (Internal Rotation) · Whole Leg · Systemic

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Examination must include the hip even when the knee is the complaint — gait, the look/feel/move of the hip with particular attention to internal rotation (lost early in SUFE and hip disease), the whole leg and the joint above and below, plus a systemic examination for the sinister causes.

🦵 The limb

Step	What it shows
Gait	Antalgic (painful), Trendelenburg; refusal to weight-bear (septic).
Hip — internal rotation especially	Restricted/painful internal rotation, externally rotated leg = SUFE/hip pathology (Kyle).
Examine knee, ankle, foot, whole leg	Normal knee with hip findings = referred (SUFE/Perthes'); don't miss foot/leg causes.
Leg length / muscle wasting	Chronic hip disease (Perthes', DDH).

⚕️ Systemic / red flags

Check	Why
Temperature / unwell	Septic arthritis/osteomyelitis.
Pallor, bruising/petechiae, lymphadenopathy, hepatosplenomegaly	Leukaemia (NG12).
Other joints, rash	JIA/reactive arthritis.
Bruising patterns / other injuries	Safeguarding/NAI.

🎓 SCA Checkpoint — Step 3TasksGlobal Skills

Narration that scores

"I'll watch him walk, examine his hip — especially rotating it inwards — as well as the knee and the whole leg, and check him over generally for anything else, like glands or bruising."

Deductions

Examining only the knee; not testing hip internal rotation
No systemic exam for leukaemia/safeguarding signs

Step 4

Investigations — Imaging (Frog-Lateral) · Bloods · FBC for Red Flags

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Investigations are directed by the suspected cause: hip X-ray (AP + frog-lateral) for SUFE/Perthes'; inflammatory markers and a very urgent FBC for the emergencies (septic arthritis, leukaemia); and ultrasound for effusion/DDH — though many decisions (admit/refer) are made clinically and shouldn't wait for tests.

🦴 Imaging

Test	When
Hip X-ray (AP + frog-lateral)	SUFE (frog-lateral of both hips is key; cross-table lateral instead if an unstable slip is suspected) and Perthes' — often arranged via urgent orthopaedics.
Ultrasound hip	Effusion (septic/transient synovitis); DDH in infants.
MRI / bone scan	Osteomyelitis, early Perthes', tumour (specialist).
X-ray of painful site	Suspected fracture/toddler's fracture.
Very urgent X-ray (within 48 h)	Unexplained bone pain or swelling — NICE NG12 direct-access route for suspected bone sarcoma.

🧪 Bloods

Test	Why
FBC, blood film	Leukaemia (very urgent if NG12 features); infection.
CRP/ESR	Septic arthritis/osteomyelitis (Kocher); inflammation.
Blood cultures	Suspected sepsis/osteomyelitis.
Joint aspiration	Definitive for septic arthritis (in hospital).

🎓 SCA Checkpoint — Step 4Tasks

Key reasoning

"The orthopaedic team will get a specific hip X-ray (a 'frog-leg' view) that shows a slipped growth plate. If a child looked feverish or unwell I'd also be arranging urgent blood tests for infection — and a very urgent blood count if I were worried about anything in the blood."

Deductions

Forgetting the frog-lateral view for SUFE
Not arranging urgent FBC when leukaemia features are present
Waiting for tests instead of admitting suspected septic arthritis

Step 5

Diagnosis — By Age & Pattern · The Dangerous Masqueraders

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Reach the diagnosis through age, weight-bearing/systemic status and examination — and consciously hold the dangerous masqueraders (SUFE behind "knee pain", septic behind "viral limp", leukaemia behind "growing pains").

Diagnosis	Discriminating features	Age
SUFE	Overweight adolescent; hip/thigh/knee pain; externally rotated leg; ↓ internal rotation; normal knee (Kyle).	10–16
Septic arthritis	Won't weight-bear/move joint; fever; unwell; raised inflammatory markers — emergency, any age.	Any
Transient synovitis	Well child, post-viral, low/no fever, improving — exclusion diagnosis.	3–10
Perthes'	Insidious limp, hip/knee pain, restricted hip movement; AVN of femoral head.	3–10
DDH	Infant/toddler; asymmetry, limited abduction, leg-length difference.	0–3
🟣 Leukaemia / 🛡️ NAI / other	Bone pain + systemic features (NG12); inconsistent history/other injuries (safeguarding); JIA, osteomyelitis, toddler's fracture, growing pains.	Any

🚩 The one rule that saves the case

Examine the hip in a child with knee pain. Kyle's formulation is SUFE — an overweight 13-year-old with knee/thigh pain, an externally rotated leg, restricted hip internal rotation and a normal knee — needing urgent orthopaedic referral and non-weight-bearing to prevent avascular necrosis, NOT physiotherapy. The same discipline (reason by age, screen the emergencies, examine the joint above) catches the septic hip, Perthes', DDH and the leukaemia/safeguarding red flags.

🎓 SCA Checkpoint — Step 5Tasks

Explaining it plainly

"His knee is fine — the problem is in his hip. It looks like the growth plate at the top of the thigh bone has slipped, which is why his leg turns out and his hip is stiff. It's treatable, but he needs to be seen by the bone specialists urgently and not put weight on the leg."

Deductions

Diagnosing a knee problem; missing SUFE
Calling it transient synovitis/growing pains without exclusion

Step 6

Referral — Emergency Paediatrics · Same-Day Orthopaedics · NG12 48-Hour Routes · Safeguarding

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Referral is danger-led: emergency paediatrics/orthopaedics for septic arthritis; a very urgent FBC (within 48 h) for suspected leukaemia, with immediate specialist assessment if there are petechiae or hepatosplenomegaly (NG12); same-day orthopaedics for suspected SUFE; urgent orthopaedics for Perthes'/DDH; and the safeguarding pathway where abuse is suspected.

Referral	Who / when	Urgency
🔴 Emergency paediatrics/orthopaedics	Septic arthritis/osteomyelitis — admission, aspiration, IV antibiotics.	Same day
🟣 Suspected leukaemia (NG12)	Any NG12 feature (persistent/unexplained bone pain alone counts) → very urgent FBC; unexplained petechiae or hepatosplenomegaly → immediate specialist assessment; unexplained bone pain/swelling → consider very urgent X-ray (sarcoma).	48 h / immediate · NG12
Same-day orthopaedics	Suspected SUFE — non-weight-bearing until seen (Kyle).	Same day
Urgent orthopaedics	Perthes', DDH.	Urgent
Safeguarding / paediatrics	Suspected non-accidental injury.	Per child-protection pathway
Paediatric rheumatology	Suspected JIA — BSPAR standard: seen within 10 weeks of symptom onset and 4 weeks of referral.	≤4 weeks

🎓 SCA Checkpoint — Step 6Tasks

Decisive action

"I'm referring Kyle to the orthopaedic team urgently today — I'll call them, and in the meantime he must not put weight on that leg. I'll arrange how he gets there safely."

Deductions

Referring SUFE to physiotherapy/routine
Not admitting septic arthritis / not escalating leukaemia features

Step 7

Management — Expectation · Goals · Non-Drug Care · Prescribing · Drug Cards · Psychosocial · Follow-Up · Monitoring · Safety-Netting

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Management is cause-specific and, for the emergencies, is mostly about timely recognition and the right referral: non-weight-bearing and urgent orthopaedics for SUFE; admission for septic arthritis; supportive care with safety-netting for transient synovitis; and clear family communication throughout.

Overview — management by cause

🎯 By cause

Cause	Management
SUFE (Kyle)	Non-weight-bearing; same-day orthopaedics; surgical fixation; check/monitor the other hip; weight management later.
Septic arthritis	Emergency admission; aspiration + IV antibiotics; orthopaedics.
Transient synovitis	Only if aged 3–9, well, afebrile, weight-bearing, limp <48 h (the site uses 48 hours; CKS allows up to 72). Rest, analgesia (ibuprofen/paracetamol), reassurance; safety-net; review at 48 h; if improving, check resolution at ~1 week; same-day assessment if worse, febrile or not settling.
Perthes' / DDH	Orthopaedic-led (observation, bracing, surgery as indicated).
Leukaemia / NAI	Specialist/child-protection pathways.

🛡️ Cross-cutting

Element	Detail
Safety-net (esp. transient synovitis)	Return immediately if fever, won't weight-bear, increasing pain, unwell, or not improving — explicit and written.
Analgesia	Weight-appropriate paracetamol/ibuprofen.
Support the family	Explain clearly, involve parents, arrange transport/time off school.
Review	Re-examine persistent/worsening limp; reconsider the differential if not resolving.
Don't over-label	"Growing pains" only with classic features and a normal exam, after exclusion.

7A — Address the parent's expectation first: validate → explain → negotiate

🤝

Mrs Morrison wants a physiotherapy referral for "his knee". The safe plan is same-day orthopaedics and no weight on the leg — so name her expectation, explain the hip, and agree the new plan together

Validate — name the expectation and the reasoning behind it

Her request is reasonable on the information she has: the pain is in the knee, Kyle is sporty-ish, and physiotherapy is what friends were offered for knee pain. She is frustrated that it has dragged on for weeks. Acknowledging the frustration and her logic before changing the plan stops the change from feeling like a dismissal — and it gives Kyle permission to hear the explanation without feeling blamed for his weight or for "making a fuss".

"You came in hoping for physio for his knee, and I can completely see why — that's where he feels it, and it's been going on for weeks now. I'm glad you brought him, because I've found something important that changes what we need to do."

Explain — the hip sends pain to the knee, and the growth plate has slipped

Use one clear picture: the ball at the top of the thigh bone sits on a growth plate, like a scoop of ice cream on a cone, and in some teenagers during a growth spurt the ball starts to slide off. The nerves that supply the hip also supply the skin around the knee, so the brain reads it as knee pain. The knee exam is normal; the hip exam is not — his hip will not turn inwards and his leg rolls out. Explain why physiotherapy is wrong: exercise and weight-bearing load the slipping growth plate. Explain why speed matters: a slip that becomes unstable risks cutting off the blood supply to the ball of the hip (avascular necrosis), which is permanent.

"When I examined his knee, it was completely normal. But when I turned his hip inwards it was stiff and sore, and his leg rolls outwards. That pattern makes me think the growth plate at the top of his thigh bone has slipped — it's called a slipped upper femoral epiphysis. Hip problems often show up as knee pain, which is why it's been so confusing."

Negotiate — offer a concrete, practical plan today

The non-negotiables are same-day orthopaedic assessment and no weight on the right leg until he is seen. What is negotiable is how you make that happen: you phone the on-call orthopaedic team, write the referral letter, advise on how he travels (carried or by wheelchair to the car, crutches only if he is already confident and told not to put the foot down), and you help with the school and work fallout. Offer analgesia now. Tell her what to expect at hospital — X-rays, likely admission and an operation to hold the hip with a screw, usually soon after diagnosis.

"Here's what I'd like to do: I'll ring the orthopaedic team at the hospital now so they're expecting him today. Until they've seen him he mustn't put any weight on that right leg — not even to hop to the car if you can avoid it. I'll give him something for the pain and a letter to take. Does that feel doable, and what would make getting there today easier?"

Key principle: Unlike most "expectation" consultations, the plan here is not up for negotiation — delay can cost Kyle his hip. The skill is to be firm on the what (same day, non-weight-bearing) and flexible on the how (transport, analgesia, school, siblings, parental work), so the family leaves feeling looked after rather than overruled. The same structure works for the other limp scenarios: for a well 5-year-old with probable transient synovitis the expectation might be "an X-ray to be sure" — validate it, explain why a watchful 48-hour review is safer and more informative, and negotiate a clear review time and return criteria.

7B — Why treatment matters: goals tailored to this child, and the numbers behind them

Treatment goals — Kyle

Seen by orthopaedics today; non-weight-bearing until thenStable slip fixed before it becomes unstable Adequate pain relief without masking red flagsOther hip watched until the growth plates close Back to school quickly with practical adjustmentsGraded return to sport as the surgeon advises Weight addressed later, sensitively, as a familyFamily know exactly which new symptoms mean "come back today"

Motivational language — tailored to Kyle and his mother

"Kyle, the reason I'm being so strict about not standing on that leg is that right now your hip is still holding together. If we keep it that way until the surgeons fix it, the outlook is really good — most teenagers get back to normal activities, including sport, once it has healed."

"You did exactly the right thing bringing him in. This is one of those conditions where getting it seen quickly makes the biggest difference — and that's what we're doing today."

Age >9

Acute limp with painful or restricted hip movement (especially internal rotation) → urgent same-day assessment to exclude SUFE

Under 3

Acute limp → same-day assessment: transient synovitis is rare and septic arthritis more likely

3–9 y · <48 h

Only window in which a well, afebrile, weight-bearing child may be given a provisional diagnosis of transient synovitis in primary care, with review at 48 hours (the site uses 48 hours; CKS allows up to 72)

48 hours

NICE NG12: very urgent FBC for leukaemia features (bone pain alone qualifies); very urgent X-ray for unexplained bone pain or swelling (sarcoma)

47% vs 0%

Avascular necrosis in unstable vs stable SUFE in Loder's 1993 series of acute slips — why a stable slip must be protected from becoming unstable

3% → 99.6%

Kocher 1999: probability of septic hip rises from 3% (one predictor) to 99.6% (all four: fever >38.5 °C, non-weight-bearing, ESR ≥40, WCC >12) — derivation-cohort figures; estimates vary by population and setting, and the score never excludes septic arthritis

Amber feature

NICE NG143: in a febrile under-5, a non-weight-bearing limb, not using an extremity or a swollen limb/joint is an amber (intermediate-risk) feature — and NG143 says consider septic arthritis/osteomyelitis

4 wk / 10 wk

BSPAR standards: suspected JIA seen by paediatric rheumatology within 4 weeks of referral and 10 weeks of symptom onset

Suitable?

NICE CG89 (updated Dec 2025): suspect maltreatment if a fracture has an absent or unsuitable explanation; bruising or other injuries in a child who is not independently mobile are a specific concern

7C — Non-medication management: mechanism + evidence + tailored advice

In the limping child, "non-drug management" is mostly about protecting the joint and the child while the right team takes over. The key interventions differ sharply by diagnosis: strict non-weight-bearing for suspected SUFE, rest-then-return for transient synovitis, maintaining range and low-impact activity in Perthes', movement and physiotherapy in JIA, and — for all of them — school adjustments, family support and, later, weight management where relevant.

🦯

Strict Non-Weight-Bearing (Suspected SUFE)

Target: no weight through the leg until orthopaedics have seen him

Mechanism

In SUFE the femoral head slips posteriorly and medially on the weakened proximal femoral physis. Loading through the leg drives further slip; a stable slip that becomes unstable (the child cannot bear weight even with crutches) carries a much higher risk of avascular necrosis because the retinacular vessels supplying the head can be torn or kinked.

Practical

From the consulting room: wheelchair to the car if available, no hopping or walking "just to the door". Crutches only if he can already use them safely with the right foot off the ground. Hospitals will usually admit and fix promptly. Do not send him for a routine outpatient X-ray and home to wait.

Suspected SUFE → urgent same-day orthopaedic assessment; non-weight-bearing until seen (Am Fam Physician 2017 SCFE review, international)

🛋️

Rest Then Graded Return (Transient Synovitis)

Target: normal walking within about a week; review at 48 h

Mechanism

Transient synovitis is a self-limiting, usually post-viral, sterile inflammation of the hip synovium with a small effusion. Rest reduces intra-articular pressure and pain; anti-inflammatory analgesia may shorten symptoms. The natural history is improvement over days — which is exactly why failure to improve is itself a red flag.

Practical

Let the child choose their level of activity; avoid sport and trampolining until walking normally. Keep them off nursery or school only while they cannot walk comfortably. Give a written sheet with the return criteria and the 48-hour review time. If not fully resolved by around a week, or it recurs, reassess and consider imaging for Perthes'.

Provisional diagnosis only in well, afebrile, weight-bearing 3–9-year-olds with limp <48 h (the site uses 48 hours; CKS allows up to 72) — review at 48 h

🏊

Maintain Range, Reduce Impact (Perthes')

Target: keep hip abduction and rotation; low-impact activity

Mechanism

Perthes' is idiopathic avascular necrosis of the femoral epiphysis followed by fragmentation and slow re-ossification over years. Outcome depends on keeping the femoral head "contained" in the acetabulum and spherical as it remodels; stiffness (especially loss of abduction) and a younger age at onset influence prognosis — younger children generally do better.

Practical

Management is led by paediatric orthopaedics: observation, physiotherapy to keep range, activity modification (swimming and cycling rather than running and jumping), and surgery for some older children. The GP role is recognition, prompt referral, analgesia, school letters and supporting a family through a condition that can last several years.

Referral route: X-ray the hip and refer to paediatric orthopaedics (Am Fam Physician 2023 limp review, international)

🏫

School, PE & an Individual Healthcare Plan

Target: minimal missed school; safe access to lessons and exams

Mechanism

After SUFE fixation or during Perthes' or JIA, children face weeks to months on crutches or with restricted activity. Missed school and exclusion from PE and friendships drive low mood and social withdrawal — particularly for a teenager who may already feel self-conscious about his weight.

Practical

Schools in England have a statutory duty to support pupils with medical conditions (DfE, Supporting pupils at school with medical conditions). Ask for an individual healthcare plan: lift pass, leaving lessons early to avoid crowded corridors, a buddy to carry bags, ground-floor rooms, and an adapted PE role (scoring, coaching) rather than exclusion. Exam access arrangements if exams fall during recovery.

Keeps the young person connected to school and peers — the strongest protection against secondary low mood

🥗

Family-Based Weight Management (Later, Not Today)

Target: raise at a follow-up, with consent, as a family plan

Mechanism

Obesity increases the shear force across the proximal femoral physis during the pubertal growth spurt and is the strongest modifiable risk factor for SUFE, including slips of the other hip. Weight also affects anaesthetic risk and later hip health. But raising weight on the day of an urgent diagnosis risks shame and disengagement.

Practical

NICE NG246 (2025) favours respectful, non-stigmatising conversations and multicomponent, family-based interventions for children and young people living with obesity (diet, activity, behaviour change), tailored to the family. Plot BMI centile, ask permission, and focus on the whole family's habits and on activities Kyle can do while recovering (upper-body work, swimming once the surgeon allows).

NICE NG246: tailored, family-based, non-judgemental approach for children and young people

🤸

Physiotherapy — When It Is and Isn't Right

Target: physio after diagnosis, never instead of it

Mechanism

Physiotherapy is central after SUFE fixation (gait retraining, strengthening, graded return), in Perthes' (range of movement), in JIA (joint protection, strength, function) and in Osgood-Schlatter (load management and strengthening). It is harmful as a first step in undiagnosed hip pathology because it delays diagnosis and loads a slipping physis.

Practical

Say it plainly to the parent who asked for physio: "Physio will very likely be part of his recovery — after the surgeons have made the hip safe." For an adolescent with typical Osgood-Schlatter and a normal hip exam, activity modification and strengthening are first-line, with physiotherapy if not settling (see the Reasoning GP Osgood-Schlatter page).

Reframes the parent's request as "yes, later" rather than "no"

7D — Prescribing guide: analgesia and fever in the limping child (NICE NG143 · MHRA)

There is no disease-modifying drug the GP gives for a limp. Prescribing is about safe symptom relief while the diagnosis is secured — and about not obscuring the red flags. Paracetamol and ibuprofen at weight- or age-appropriate doses per children’s SPC are the mainstays. Definitive treatment (IV antibiotics for septic arthritis, surgical fixation for SUFE, disease-modifying drugs for JIA) belongs to secondary care.

Step 1 — Paracetamol or ibuprofen

Dose per children’s SPC and local paediatric formulary (by age/weight)

Ibuprofen is a sensible first choice for probable transient synovitis — its anti-inflammatory action may shorten symptoms (Kermond et al., Ann Emerg Med 2002: RCT of 36 children, median symptom duration 2 vs 4.5 days with placebo)
Paracetamol if NSAIDs are unsuitable (e.g. dehydration, NSAID-sensitive asthma, chickenpox — see children’s SPC cautions)
Check what has already been given today before advising the next dose
Weight-based dosing: record the child's weight

Pain that settles with ibuprofen does not rule out septic arthritis or SUFE — analgesia can make a sick joint look better

Step 2 — If there is fever (NICE NG143)

Treat distress, not the number

NG143: use paracetamol or ibuprofen for a febrile child who appears distressed, not simply to lower the temperature
Do not give both at the same time; consider alternating only if distress persists or recurs before the next dose is due
Antipyretics do not prevent febrile seizures
A febrile child who won't weight-bear or use a limb has an amber NG143 feature, and NG143 asks you to consider septic arthritis/osteomyelitis → same-day assessment for septic arthritis/osteomyelitis

If the child looks septic, arrange emergency transfer and follow NICE NG254 (suspected sepsis in under 16s) and local policy — analgesia and antipyretics are not the priority

What not to prescribe

Codeine under 12: contraindicated for pain (MHRA Drug Safety Update, July 2013); for 12–18-year-olds only for acute moderate pain not relieved by paracetamol or ibuprofen, short course
Aspirin under 16: avoid (Reye's syndrome — children’s SPC)
Oral antibiotics "just in case" for a hot joint or febrile limp — send for assessment instead; antibiotics before cultures can obscure the diagnosis
Oral steroids for an undiagnosed swollen joint — can mask infection and leukaemia; JIA steroids are specialist-directed

Escalating analgesia for an unexplained limp is a diagnostic signal, not a prescribing problem — re-examine and reconsider

Diagnosis	Primary care prescribing	Secondary care treatment (for explanation to families)
Suspected SUFE (Kyle)	Paracetamol ± ibuprofen for the journey; dose per children’s SPC. Nothing that delays transfer.	Usually surgical fixation (commonly a single screw across the growth plate "in situ"); some units consider fixing the other side prophylactically; crutches and physiotherapy afterwards.
Septic arthritis / osteomyelitis	None before assessment — arrange same-day emergency paediatric/orthopaedic assessment; 999 if septic.	Blood cultures, imaging, joint aspiration/washout, empirical IV antibiotics per local microbiology policy (covering Staphylococcus aureus and, in young children, Kingella kingae), then oral switch.
Transient synovitis	Ibuprofen (or paracetamol) regularly for a few days, dose per children’s SPC; review at 48 h.	Not needed unless atypical; hospital may ultrasound the hip or check bloods if the picture is uncertain.
Perthes'	Simple analgesia for flares.	Observation, physiotherapy, sometimes bracing or osteotomy — orthopaedic-led.
JIA	NSAID for symptoms while awaiting rheumatology; do not start steroids.	Intra-articular steroid injections, methotrexate (specialist-initiated, once weekly, with shared-care monitoring), biologics per NICE TA373 (polyarticular JIA) and TA238 (systemic JIA); uveitis screening.
Suspected leukaemia / sarcoma	Analgesia as needed; avoid steroids; very urgent FBC or X-ray (NG12).	Paediatric oncology at a principal treatment centre.

7F — Drug reference cards: the limping child

Ibuprofen

Oral suspension or tablets · dose per children’s SPC (age/weight)

First-lineDose per children’s SPC and local paediatric formulary

✓ Prefer when

Probable transient synovitis in a well child — anti-inflammatory action may shorten symptoms

Post-traumatic soft-tissue pain; Osgood-Schlatter flares around activity (short-term)

Symptom control in suspected JIA while awaiting rheumatology

✗ Avoid / caution

Dehydration, known NSAID hypersensitivity, active GI bleeding or ulceration

Asthma — most children tolerate ibuprofen; avoid if previous NSAID-induced bronchospasm. Chickenpox and renal impairment — see children’s SPC cautions

⚠ Side effects

Dyspepsia, nausea; rarely bronchospasm, GI bleeding, renal impairment in a dehydrated child

🔬 Monitor

Response of the limp at 48 h — improvement supports transient synovitis but does not exclude sepsis. Longer courses in JIA are monitored by the specialist team.

💬 Counselling

"Give this with food or milk, at the dose on the bottle for his age and weight. It helps the pain and the inflammation in the hip. If he's still not walking properly in two days, or he gets a temperature, bring him back straight away — don't just keep giving more medicine."

SCA: pair the prescription with the safety-net. "Ibuprofen and review at 48 hours" scores; "ibuprofen and see how he goes" does not.

Paracetamol

Oral suspension, soluble or tablets · dose per children’s SPC

First-lineDose per children’s SPC and local paediatric formulary

✓ Prefer when

NSAIDs unsuitable (dehydration, NSAID-sensitive asthma, chickenpox)

Journey analgesia for a child being sent to hospital

Febrile, distressed child (NICE NG143) — alternate with ibuprofen only if distress persists before the next dose

✗ Avoid / caution

Exceeding the maximum daily dose — check all sources, including combination cold remedies

Hepatic impairment; low body weight — dose by weight

⚠ Side effects

Rare at therapeutic doses; hepatotoxicity in overdose

🔬 Monitor

Total daily intake; whether pain relief is masking a deteriorating picture

💬 Counselling

"This is for comfort, not a cure. Use the syringe that comes with the bottle and stick to the dose for his weight. Don't give it at the same time as ibuprofen — if you're using both, space them out."

Stating "dose per children’s SPC, by weight" is safer than quoting a number from memory in the exam.

Codeine (and codeine combinations)

Co-codamol · codeine phosphate · dose per children’s SPC

RestrictedNot under 12 for pain

✓ Only when

Age 12–18 with acute moderate pain not relieved by paracetamol or ibuprofen alone — shortest course (MHRA, July 2013)

Rarely needed in the limping child: severe pain is itself a reason for same-day assessment

✗ Avoid if

Under 12 years (pain indication) — MHRA contraindication

Under 18 after tonsillectomy/adenoidectomy for obstructive sleep apnoea; known CYP2D6 ultra-rapid metaboliser

Respiratory compromise; breastfeeding mothers

⚠ Side effects

Sedation, constipation, nausea; respiratory depression in ultra-rapid metabolisers

🔬 Monitor

Sedation; bowels; duration — review within days

💬 Counselling

"I'd rather not use stronger painkillers — if paracetamol and ibuprofen aren't enough, that tells me the hip needs looking at again today, not a stronger tablet."

Reaching for codeine for a limping child is a Tasks deduction: severe or escalating pain should trigger reassessment and referral.

Antibiotics for septic arthritis / osteomyelitis

IV empirical therapy per local microbiology policy — hospital-initiated

Secondary carePer local policy

✓ Role

Started in hospital after blood cultures (and ideally joint aspirate), covering S. aureus and, in young children, Kingella kingae; later switched to oral therapy

If sepsis is suspected in the community, follow NICE NG254 and local pre-hospital arrangements

✗ Avoid

Starting oral antibiotics in primary care for a suspected septic joint "while waiting"

Recent antibiotics for another infection can mask fever and blunt markers — lower your threshold to send

⚠ Relevance to GP

Post-discharge: long oral courses; check adherence, rash, diarrhoea; ask about recurrence of pain or fever

🔬 Monitor

Hospital follows inflammatory markers and function; GP watches for recurrence, growth disturbance or leg-length difference later

💬 Counselling

"I'm not going to start antibiotics here, because the hospital needs to test the joint first to find the right one — that's why I'm sending him in now rather than giving tablets."

Explaining why you are not giving antibiotics scores in both Tasks and Relating to Others.

Methotrexate (JIA — specialist-initiated)

Once-weekly oral or subcutaneous · with folic acid · shared care

SpecialistPer specialist / shared-care protocol

✓ Role

Disease-modifying treatment for polyarticular or persistent JIA, initiated by paediatric rheumatology

GP continues prescribing and blood monitoring under a shared-care agreement

✗ Caution

Once-WEEKLY dosing only — fatal errors from daily dosing (MHRA Drug Safety Update, September 2020)

Live vaccines; interacting drugs (e.g. trimethoprim, co-trimoxazole); pregnancy planning in adolescents

⚠ Side effects

Nausea, mouth ulcers, abnormal LFTs, cytopenias, increased infection risk

🔬 Monitor

FBC, LFTs, U&E at the intervals in the shared-care protocol; varicella status; uveitis screening continues separately

💬 Counselling

"This is taken once a week, on the same day each week — never daily. If she gets a sore throat, fever, mouth ulcers or unusual bruising, contact us for a blood test the same day."

JIA variant: recognising morning stiffness and a limp that improves through the day, and referring within BSPAR timescales, is the GP task — not starting DMARDs.

7G — Psychosocial impact of the diagnosis: school, sport, family, identity and driving

🤝

The limping child — a teenager on crutches, a parent who "should have known", and a family reorganised overnight

A diagnosis like SUFE turns an irritating knee ache into an emergency admission and an operation. For Kyle it means crutches, missed school and sport, and — if handled clumsily — a sense that his body and his weight are to blame. For his mother it may mean guilt ("I thought it was just his knee"), time off work and a scramble to organise other children. Addressing these explicitly is part of good management and strongly influences how well the family engages with follow-up.

🏫

School & Exams

Post-operative crutches mean stairs, crowded corridors and heavy bags become hazards. Missed lessons accumulate quickly. A letter to school and a request for an individual healthcare plan (DfE statutory guidance on supporting pupils with medical conditions) turns an ad-hoc problem into an organised one.

"Would it help if I wrote to school explaining what's happened and what he'll need — like a lift pass and leaving lessons a few minutes early — so you don't have to argue for it?"

⚽

Sport, Friends & Identity

For many adolescents, sport is where friendships happen. Being told "no PE" for months can feel like exclusion. Offer a role (scorer, coach's assistant) and a realistic timeline set by the surgeon, and name the good news: most children return to full activity after a stable slip is fixed.

"Kyle, the surgeons will tell you when you can play again — it's usually months, not years. In the meantime, is there a way you can still be part of the team?"

⚖️

Weight, Shame & Stigma

Kyle may already be teased about his weight. Linking his hip directly to his size in the first conversation risks shame and disengagement. NICE NG246 emphasises respectful, non-stigmatising language and family-based approaches. Deal with the hip today; ask permission to talk about weight at follow-up, framed as health and the other hip, not blame.

"At a later appointment, would it be OK to talk as a family about things that can help protect his other hip — like activity and food? No one's to blame for this."

👩‍👦

Parental Guilt & Family Logistics

"Should I have brought him sooner?" is a common unspoken worry. Knee-presenting SUFE is frequently missed by clinicians too. Acknowledge that and move to the practical: time off work, siblings, transport, parking, how long the admission might be.

"Lots of people — doctors included — are caught out because it feels like the knee. You've done the right thing. What do you need to sort out today to get him to the hospital?"

🚗

Driving & Transport

Kyle is too young to drive, so the DVLA question does not arise for him — but transport does: he should be taken by car or wheelchair, not walk or cycle. For an older adolescent who drives (17+) and has hip surgery, the DVLA does not set a fixed no-driving period after limb surgery; the driver must be able to control the car safely, including an emergency stop, and should follow the surgeon's advice and check with their insurer.

"Please drive him there rather than letting him walk or get the bus — every step on that leg matters until the surgeons have seen him."

🛡️

Safeguarding Without Accusation

In other variants — a toddler with a fracture, a non-mobile infant with bruising, a story that changes — NICE CG89 requires you to consider maltreatment. The skill is to be open and non-accusatory while following the local pathway: discuss with the safeguarding lead or on-call paediatrician and document the explanation given verbatim.

"With any injury in a young child we always make sure we fully understand how it happened, and sometimes that means the children's team taking a look too. It's a routine part of keeping children safe."

7H — Follow-up schedule

Today (Day 0) — Same-Day Orthopaedic Assessment

Phone the on-call orthopaedic registrar; send a referral letter with history, examination (restricted internal rotation, externally rotated gait, normal knee), weight and analgesia given. Non-weight-bearing advice given and understood by Kyle and his mother. Transport arranged. Documented: safety-net, SUFE suspected, parent's physiotherapy request discussed and plan agreed. For other scenarios: septic → emergency admission; under 3 → same-day paediatrics; NG12 features → very urgent FBC or X-ray within 48 h; safeguarding → discuss with lead the same day.

Same dayNon-weight-bearing

Days 1–7 — Check the Outcome

Confirm Kyle was seen (a quick check of the hospital record or a phone call closes the loop — referrals get lost). Read the discharge letter: stable vs unstable slip, fixation, plan for the other hip, weight-bearing status, follow-up clinic. Update the problem list. Offer a school letter and a fit note for the parent if needed (for her own absence, discuss options). For transient synovitis: the 48-hour review falls here — if improving, see again at about a week; if not, same-day assessment.

Close the loop48-h review (TS)

2–6 Weeks — Recovery and Coping

Wound healing, pain, crutch use and falls; mood, sleep and school attendance; how the family is coping. Ask specifically about any pain in the other hip, groin, thigh or knee — a contralateral slip can occur and may again present as knee pain. Reinforce physiotherapy and surgeon's activity advice. For suspected JIA: has rheumatology seen the child within the BSPAR 4-week standard? Has eye screening been arranged?

Ask about the other hipMood & school

3–6 Months — Return to Activity & Weight Conversation

Graded return to sport per orthopaedics. With permission, the weight conversation as a family: plot BMI centile, explore activity, food and sleep, and offer local family-based weight management services in line with NICE NG246. Screen for low mood or bullying. For Perthes': ongoing orthopaedic surveillance; GP supports activity modification and school letters.

NG246 family approachGraded sport

Until Skeletal Maturity — Keep the Hip on the Radar

Orthopaedics usually follow SUFE until the growth plates close. Code the diagnosis so any clinician seeing Kyle with new hip, thigh or knee pain examines both hips and has a low threshold for same-day referral. Longer term, SUFE is associated with femoroacetabular impingement and earlier hip osteoarthritis — relevant if he re-presents with hip pain as a young adult.

New pain = same-day X-ray/orthoCoded on record

7I — Monitoring: by diagnosis

Memory rule — "Walk, Warm, Well, Weight, Watch"

At every review of a limping child: Walk — is the gait normalising, and can they weight-bear? Warm — any fever? Well — any new systemic features (pallor, bruising, night pain, weight loss)? Weight — record it (for dosing and, where relevant, BMI centile). Watch — the other hip, the joint above and below, and the safeguarding picture.

Condition / treatment	Monitor	Timing	Action threshold
Transient synovitis (provisional)	Weight-bearing, gait, temperature, general wellbeing	48 h after onset; then ~1 week if improving	Worse, febrile, unwell, not weight-bearing, or not settling → same-day hospital assessment. Recurrent or persistent limp → consider Perthes' (hip X-ray, orthopaedics)
SUFE — after fixation	Pain in either hip/thigh/knee; gait; weight-bearing status	Each contact until skeletal maturity (orthopaedic follow-up)	New pain on the other side → same-day orthopaedics. Persistent stiffness or limp → orthopaedic review (AVN, chondrolysis, impingement)
Perthes'	Hip range (abduction, internal rotation), pain, activity, school	Per orthopaedic plan; GP at each flare	Increasing stiffness or pain → bring forward orthopaedic review
JIA	Joint swelling, morning stiffness, function; uveitis screening attendance	Rheumatology within 4 weeks of referral (BSPAR); eye screening per BSPAR/RCOphth schedule	Red or painful eye, photophobia or blurred vision → same-day ophthalmology. Missed eye screening → chase — JIA uveitis is often asymptomatic
Methotrexate (JIA)	FBC, LFTs, U&E	Per shared-care protocol	Cytopenia, rising transaminases or intercurrent severe infection → withhold and discuss with specialist. Confirm once-weekly dosing at every issue (MHRA 2020)
NG12 investigations	FBC and film; X-ray report	Result reviewed within 48 h	Abnormal FBC/blast cells → same-day paediatric haematology discussion. X-ray suggests sarcoma → very urgent referral (appointment within 48 h). Normal result but symptoms persist → re-examine and reconsider
Safeguarding concern	Outcome of strategy discussion; attendance; new injuries	As agreed with children's social care	Any new unexplained injury → repeat referral; record in the child's and linked family records per local policy

7J — Safety-netting: exact phrases + RAG marking + danger zones

⚠ Three scenario-specific phrases — use these verbatim

Why safety-netting matters beyond clinical care — document it

Hip examined and findings recorded for every child with knee or thigh pain — "hip ROM: internal rotation restricted and painful on right; knee normal"

Febrile/systemic screen recorded — temperature, weight-bearing status, NG143 traffic-light features in under-5s

Referral: time, name/grade of orthopaedic clinician accepting, advice given ("non-weight-bearing until assessed")

Parent's request for physiotherapy discussed; reasons for different plan explained and agreed

NG12 screen documented as negative (no night pain, pallor, bruising, lymphadenopathy, hepatosplenomegaly, fever)

Safeguarding: explanation for injury recorded verbatim; consistency with development; discussion with lead if any concern (NICE CG89)

TodaySame-day orthopaedics; non-weight-bearing; transport; letter; safety-net documented

Days 1–7Confirm seen; read discharge letter; school letter; TS review at 48 h

Weeks–monthsOther hip; mood/school; graded sport; weight as a family (NG246)

💬 Key phrases

💭 The hip–knee link

"The nerves from the hip also supply the knee, so a hip problem often feels like knee pain. That's why I always check the hip when a child has knee pain."

😟 Naming the concern

"I'm worried that the growth plate at the top of his thigh bone has slipped. It's treatable, and it's best treated quickly — which is why I want him seen today."

🎯 Physio — "yes, later"

"Physio will probably be part of his recovery — but after the surgeons have made the hip safe. Exercising it now could make the slip worse."

🤝 Relieving guilt

"You did the right thing bringing him. This catches out lots of people, doctors included, because it really does feel like the knee."

🔬 Why no weight

"Think of the top of the thigh bone like a scoop of ice cream on a cone. Standing on it pushes the scoop further off. Keeping weight off holds it where it is until they fix it."

📋 Safety-net and close

"If the pain suddenly gets much worse or he can't move the leg, call 999. Later on, any pain in the other hip or knee — come in the same day. What questions do you both have?"

🔴🟠🟢 RAG — all three domains

Tasks

🟢

Examines the hip for knee pain; recognises SUFE; same-day orthopaedics by phone; non-weight-bearing advised; septic, NG12 and safeguarding screens documented; analgesia per children’s SPC; codeine avoided; other-hip safety-net

🟠

Suspects a hip cause but routes as "urgent" outpatient or routine X-ray; non-weight-bearing not explicit; partial red-flag screen; no contralateral-hip advice

🔴

Knee-only exam; physiotherapy referral; "growing pains" or "sprain" label; weight-bearing allowed; no septic or NG12 screen

Relating to Others

🟢

Mother's physio expectation validated then reframed; Kyle addressed directly; urgency conveyed calmly; guilt relieved; weight not weaponised; practical help offered (transport, school)

🟠

Correct plan but delivered as an instruction; child talked about rather than to; ICE partly explored; understanding not checked

🔴

Dismisses the parent or alarms her; blames weight; no explanation of why physiotherapy is wrong; family leaves confused about weight-bearing

Global Skills

🟢

Age-structured reasoning; examination narrated; explanation chunked and checked; clear plan, follow-up and closing question within time

🟠

Reasoning present but disorganised; time spent on the knee before pivoting; safety-net rushed

🔴

No structure; runs out of time before the plan; no safety-net

🚫 Danger zones

✗

Examining only the knee→ Knee or thigh pain in a child requires a hip examination, especially internal rotation. A normal knee exam with knee pain is a clue, not reassurance.

✗

Routine X-ray and home for suspected SUFE→ Acute limp over 9 with painful or restricted hip movement needs urgent same-day assessment. Phone orthopaedics; keep non-weight-bearing.

✗

Calling it transient synovitis outside the criteria→ Under 3, over 9, febrile, unwell, non-weight-bearing, or limp over 48 h (the site uses 48 hours; CKS allows up to 72): not a primary-care transient synovitis diagnosis. Send for same-day assessment.

✗

Waiting for bloods in a febrile child who won't weight-bear→ Kocher criteria are a hospital tool. In primary care, fever plus non-weight-bearing (an amber NG143 feature in under-5s that should prompt you to consider septic arthritis/osteomyelitis) means same-day referral.

✗

"Growing pains" with night pain or systemic features→ NICE NG12: persistent or unexplained bone pain alone warrants a very urgent FBC; add X-ray within 48 h for unexplained bone pain or swelling.

✗

Oral antibiotics or steroids "to see if it helps"→ Both can mask septic arthritis or leukaemia and compromise cultures or diagnosis. Refer instead.

✗

Codeine for a child under 12→ Contraindicated for pain (MHRA 2013). Escalating analgesic need means reassessment.

✗

Ignoring an injury that doesn't fit→ NICE CG89: a fracture with an absent or unsuitable explanation (or bruising in a child who is not independently mobile) means suspect maltreatment and follow the local safeguarding pathway.

🎓 SCA Checkpoint — Step 7TasksRelating to OthersGlobal Skills

A plan that scores

"So for Kyle: urgent orthopaedic referral today, no weight on the leg, and I'll sort how he gets to hospital. (For a well child with likely transient synovitis: rest, child-dose ibuprofen, and come straight back if he develops a fever, won't put weight on it, or isn't better within a few days.)"

Deductions

Allowing weight-bearing in SUFE; physio referral
No safety-net for transient synovitis
Over-labelling "growing pains" without exclusion

"It's Kyle's knee — he's had pain in it for a few weeks and now he's limping and can't do PE. I think he just needs some physio for it, can you refer him?"

Who you are (Kyle's mother)

You've brought your son Kyle, 13, with several weeks of right knee and thigh pain and a limp that's got worse this past week. No clear injury. He's a bit overweight for his age. You're convinced it's a knee problem and want a physiotherapy referral so he can get back to sport. You're slightly impatient and feel it's "obviously his knee".

Hidden concerns (reveal if explored)

Frustration: you feel it's been going on too long and just want it sorted with physio.

Worry (if the doctor seems concerned): you become anxious if told it might be serious — you'll need clear, calm explanation and reassurance it's treatable.

Practicalities: you worry about him missing school and how you'll get to hospital.

Clinical details if asked

Knee/thigh pain several weeks, worsening; limp; no injury; can still bear weight (limping)
Overweight; around pubertal age; otherwise well
No fever, no recent illness, no night pain, no pallor/bruising/lumps, no weight loss/night sweats
Walks with the right leg/foot turned outwards (you've noticed he "walks funny")
On examination: knee is normal; the hip is stiff and uncomfortable when rotated inwards

Reactions at key moments

If the doctor only examines the knee & offers physio: you're satisfied — so a strong candidate must examine the hip and NOT do this.
On "I need to check his hip": mildly surprised ("but it's his knee"), accepting when explained.
On the SUFE explanation & urgent referral: anxious but reassured by calm clarity and that it's treatable.
On non-weight-bearing: you accept it once you understand why.
Challenge line: "Are you sure? It really seems like it's just his knee — can't he just have physio?"

"I really think you're overcomplicating this — it's his knee, he just needs physio and to rest it. Why are you sending him to hospital?"

Resolution: The consultation succeeds if the GP: (1) reasons by age and applies the rule that the hip refers to the knee — examining the hip despite a knee complaint; (2) recognises SUFE (overweight adolescent, externally rotated leg, restricted hip internal rotation, normal knee) and arranges urgent orthopaedic referral with non-weight-bearing, NOT physiotherapy; (3) screens and excludes septic arthritis (weight-bearing/fever) and the NG12 leukaemia red flags, and considers safeguarding; (4) reframes the mother's expectation calmly and clearly, conveying urgency without alarm; (5) safety-nets and supports the family practically. It fails if the GP examines only the knee and refers to physiotherapy, missing SUFE.

🏥

Clinic Quick Reference

The Limping Child — Clinical Decision Framework

Age-based · hip refers to knee · exclude the emergencies

▼expand

👶 1 — Differential by age

0–3y: DDH, septic arthritis, toddler's fracture, NAI. 3–10y: transient synovitis, septic arthritis, Perthes'. 10–16y: SUFE, septic arthritis, Perthes'. Any age: septic arthritis, malignancy (leukaemia), osteomyelitis, JIA, NAI. Always examine the hip in knee pain (SUFE/Perthes' refer to the knee).

🚦 2 — Triage & act

🔴 Same-day: won't weight-bear + fever/unwell → septic arthritis (admit, aspirate, IV abx; Kocher); bone pain + pallor/bruising/lymphadenopathy/fever → very urgent FBC within 48 h (NG12; petechiae/hepatosplenomegaly → immediate); acute limp under 3 → same-day paediatrics; suspected NAI → safeguarding (NICE CG89); suspected SUFE → same-day orthopaedics, non-weight-bearing, AP pelvis + frog-lateral X-ray of both hips (cross-table lateral if unstable). 🟠 Urgent specialist: Perthes', DDH, JIA (BSPAR ≤4 weeks). 🟢 Routine: transient synovitis (exclusion; well child; rest/analgesia/safety-net/review). Don't over-label "growing pains".

🎓

SCA Quick Reference

The Limping Child — Consultation Playbook

Age · examine the hip · exclude septic/leukaemia · SUFE urgently

▼expand

🎯 The three pivots that pass this case

1 · Examine the hip

Knee/thigh pain in a child → examine the HIP (internal rotation). SUFE & Perthes' refer to the knee.

2 · Exclude the emergencies

Won't weight-bear + fever = septic arthritis (admit). Bone pain + systemic features = NG12 leukaemia (urgent FBC). Consider NAI.

3 · SUFE urgently, not physio

Overweight adolescent, ext. rotated leg, ↓ internal rotation → urgent orthopaedics + non-weight-bearing (avoid AVN).

⛔ Don't treat knee pain without examining the hip — you'll miss SUFE/Perthes' · Don't refer SUFE to physiotherapy or allow weight-bearing · Don't assume transient synovitis/"growing pains" in a febrile, unwell or non-weight-bearing child · Don't miss leukaemia (NG12) red flags or safeguarding · Reason by age

The Limping Child · GP Clinical Reasoning Framework v2 · Am Fam Physician reviews (international): SCFE (2017) and the child with a limp (2023) · NICE NG12 (updated April 2026) Suspected cancer (children — leukaemia, bone sarcoma) · NICE NG143 Fever in under 5s · NICE NG254 Suspected sepsis in under 16s · NICE CG89 Child maltreatment · BSPAR JIA Standards of Care · Kocher criteria

Reason by age (0–3 DDH/septic/toddler's #; 3–10 transient synovitis/septic/Perthes'; 10–16 SUFE/septic/Perthes') · Always examine the hip in a child with knee pain — SUFE & Perthes' refer to the knee · Septic arthritis (won't weight-bear + fever) = same-day emergency (Kocher; aspirate + IV antibiotics) · SUFE (overweight adolescent, externally rotated leg, ↓ internal rotation) → same-day orthopaedics + non-weight-bearing + frog-lateral X-ray · Persistent/unexplained bone pain or other NG12 features → very urgent FBC within 48 h; petechiae/hepatosplenomegaly → immediate (NG12 leukaemia) · Always consider safeguarding/NAI

Teaching clinicians why each step matters — not just what to do · Always consult current NICE NG12 and local paediatric pathways · Clinical judgement takes precedence over any framework

Childhood Limp

Red Flags — the limping child you cannot miss

🦵 "It's just his knee"

🏥 Reframing to urgent care

🚫 Not physiotherapy

🛡️ Honest reassurance

Same day / 48 h

Orthopaedics

Primary care

🚩 The one rule that saves the case

Validate — name the expectation and the reasoning behind it

Explain — the hip sends pain to the knee, and the growth plate has slipped

Negotiate — offer a concrete, practical plan today

School & Exams

Sport, Friends & Identity

Weight, Shame & Stigma

Parental Guilt & Family Logistics

Driving & Transport

Safeguarding Without Accusation

Today (Day 0) — Same-Day Orthopaedic Assessment

Days 1–7 — Check the Outcome

2–6 Weeks — Recovery and Coping

3–6 Months — Return to Activity & Weight Conversation

Until Skeletal Maturity — Keep the Hip on the Radar

Memory rule — "Walk, Warm, Well, Weight, Watch"

⚠ Three scenario-specific phrases — use these verbatim

Why safety-netting matters beyond clinical care — document it

🎭 Patient actor brief — click to practise (the mother)

Who you are (Kyle's mother)

Hidden concerns (reveal if explored)

Clinical details if asked

Reactions at key moments