Always rule out infections, vascular compromise and malignancy before proceeding with routine assessment.
Septic arthritis / tenosynovitis Fusiform finger swelling, pain on passive stretch, fixed flexion, fever, raised CRP/WBC β 999 / Same-day ortho
Acute vascular compromise Cold, pale or mottled hand, absent radial pulse, pain out of proportion β 999 (vascular surgery)
High-pressure injection injury Small puncture wound, history of grease gun / paint gun injury β deceptively benign appearance β 999 immediate plastics
Necrotising fasciitis Rapidly spreading erythema, disproportionate pain, skin necrosis, systemically unwell β 999
Fracture / dislocation Significant trauma, deformity, crepitus, point tenderness β Same-day X-ray + ED
Malignancy (bone / soft tissue) Persistent pain at rest, night pain, unexplained mass, weight loss, age >50 or known primary cancer β 2WW sarcoma
Acute gout / pseudogout Explosive onset, extreme tenderness, erythema β rule out septic joint before labelling inflammatory β Same-day assessment if systemically unwell
Compartment syndrome Post-trauma or post-casting, severe pain, paraesthesia, pulselessness, pallor, paralysis β 999