Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
2 min synopsisUK scopeSources checked 27 Aug 2026Clinical review pending
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Acutely hot or damaged joint
A suddenly hot swollen joint, systemic illness, inability to bear weight after trauma, neurovascular compromise or rapidly destructive pain is not routine osteoarthritis and may represent sepsis, fracture or dislocation.
Action: Assess vital signs and the joint immediately, give appropriate analgesia, obtain urgent trauma imaging, and arrange same-day hospital assessment and synovial-fluid sampling when septic arthritis cannot be excluded.
Synopsis
Diagnose osteoarthritis clinically, distinguish expected mechanical symptoms from inflammatory or destructive disease, prioritise exercise and weight support, use analgesia proportionately, and refer for joint replacement according to disability rather than an arbitrary radiographic threshold.
In an adult aged 45 years or older, activity-related joint pain with absent morning stiffness or stiffness lasting no longer than 30 minutes can usually be diagnosed clinically as osteoarthritis.
Do not request routine imaging to confirm a typical presentation; image when features are atypical, trauma or another diagnosis is suspected, or a result will change procedural planning.
Therapeutic exercise and sustained weight-loss support when appropriate are core treatments; temporary discomfort after starting exercise does not mean joint damage is accelerating.
Key red flags
Fever, rigors, marked warmth, rapid effusion or immunosuppression with acute monoarthritis requires urgent exclusion of septic arthritis rather than attribution to an osteoarthritis flare.
Investigation priorities
01
First-line clinical assessmentFirst stepFirst line
Make a positive diagnosis in a typical adult and identify findings requiring a competing diagnostic pathway.
Management branches
First-lineBuild an individual non-drug plan
A clinical diagnosis is secure and no red flag or urgent alternative explains the painful joint.
Explain whole-joint disease, the imperfect image-pain relationship, expected fluctuations and why gradual movement is protective rather than evidence of further wear.
Offer tailored local muscle strengthening plus aerobic activity, beginning within tolerance and progressing dose, frequency or resistance with physiotherapy support when needed.
Urgent alternativeLeave the routine pathway safely
The joint is acutely hot, symptoms follow major trauma, systemic illness is present or neurological, vascular or malignant features emerge.
Key medicines
Topical diclofenac gelApply the product-specified amount to the painful joint, commonly 2–4 g of 1.16% gel three or four times daily; remain below the product maximum and review after two to four weeks.
Naproxen with gastroprotectionTake 250 mg orally twice daily and increase if necessary to 500 mg twice daily, with food, for the shortest course; add omeprazole 20 mg once daily unless another protective plan is chosen.
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.