Assessment, Diagnosis, and Clinical Evaluation
What this domain tests
Structured history and physical examination, use of clinical decision rules, and the reasoning that converts findings into a working diagnosis and appropriate referral.
Core rules and concepts
- Sequence: history (mechanism, onset, OPQRST, loading history, red flags), inspection, palpation, active and passive range of motion, resisted testing, then special tests.
- Pre-test probability drives test value: a sensitive test with a negative result helps rule out (SnNout); a specific test with a positive result helps rule in (SpPIn). Special tests performed in isolation generate frequent false positives.
- Ottawa Ankle Rules: radiography is indicated only with malleolar tenderness at the posterior edge or tip, tenderness at the base of the fifth metatarsal or navicular, or inability to bear weight for four steps. Applied correctly, they safely reduce unnecessary imaging.
- Concussion: a suspected concussion means immediate removal from play; same-day return is never appropriate. The SCAT6 structures assessment, but diagnosis remains clinical.
- Red flags mandating urgent referral: night pain, unexplained weight loss, fever, saddle anaesthesia, bladder or bowel change, progressive neurological deficit.
Worked example
A basketball player inverts the ankle. There is tenderness over the anterior talofibular ligament but none over the posterior malleolus, fifth metatarsal base or navicular, and he takes four pain-free steps. Reasoning: Ottawa rules are negative, so imaging is not indicated; the working diagnosis is a lateral ligament sprain, confirmed with anterior drawer and talar tilt, and management is functional loading rather than immobilisation.
Traps that cost marks
- Ordering imaging before applying a validated decision rule.
- Accepting a positive special test without considering pre-test probability.
- Missing a fracture or a cervical spine red flag while focusing on the sport mechanism.