McMurray’s test is positive in the injury of –
**Core Concept**
McMurray's test is a clinical examination technique used to diagnose meniscal tears in the knee joint. It involves flexion, rotation, and extension of the knee to elicit a palpable or audible "click" indicating a meniscal tear.
**Why the Correct Answer is Right**
McMurray's test is specifically designed to assess the menisci, which are cartilaginous structures between the tibia and femur in the knee joint. When a meniscal tear occurs, the meniscal fragment may move in and out of the intercondylar notch, producing a palpable or audible click during the examination. This is due to the abnormal movement of the meniscal fragment, which is detected by the examiner.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because McMurray's test is not used to diagnose ligamentous injuries, such as anterior cruciate ligament (ACL) tears. ACL injuries can be diagnosed using other clinical examination techniques, such as the Lachman test.
**Option B:** This option is incorrect because McMurray's test is not used to diagnose osteochondral fractures, which involve fractures of the bone and cartilage. Osteochondral fractures can be diagnosed using imaging studies, such as X-rays or MRI scans.
**Option C:** This option is incorrect because McMurray's test is not used to diagnose synovial plica syndrome, which involves inflammation of the synovial plicae in the knee joint. Synovial plica syndrome can be diagnosed using clinical examination and imaging studies.
**Clinical Pearl / High-Yield Fact**
A positive McMurray's test is a strong indicator of a meniscal tear, but it is essential to correlate the test with the patient's symptoms and other clinical findings to make an accurate diagnosis.
**Correct Answer:** C. Meniscal tear.