Wilson's Test is used to diagnose which condition?

• A. Meniscal tear
• B. Plica
• C. Osteochondritis Dissecans
• D. Patellofemoral pathology

Answer: (C)

Wilson's test targets the elbow to identify osteochondritis dissecans of the capitellum. In this test, the patient sits with the elbow flexed about 90 degrees and the forearm pronated while a valgus stress is applied as the elbow is slowly extended. If an OCD lesion is present, pain is elicited around 20–30 degrees of flexion due to compression and shear at the radiocapitellar joint under those biomechanics. The pain typically eases when the forearm is supinated, unloading the joint. This pattern of pain during extension with pronation distinguishes OCD of the capitellum from other conditions like meniscal tear, plica, or patellofemoral pathology, which are diagnosed with different provocative maneuvers. OCD is especially common in young athletes due to repetitive throwing or overhead activities.