**Question:** McMurray's test is positive in injury of:

* A. Patella
* B. Meniscus
* C. Cartilage
* D. Ankle

**Core Concept:**
McMurray's test is a diagnostic test performed to assess the integrity of the menisci, specifically the medial and lateral menisci, in the knee joint. The test is named after Sir Robert S. McMurray, who first described it in 1940. The menisci are crescent-shaped structures that act as shock absorbers and provide stability to the knee joint. When these structures are damaged, the test helps in identifying the problem.

**Why the Correct Answer is Right:**
McMurray's test is performed to assess the integrity of the menisci, specifically the medial and lateral menisci. In this test, the examiner applies pressure on the medial or lateral aspect of the knee joint while the patient flexes and extends the knee. If the test is positive, it indicates that the menisci are torn, causing pain or clicking/clicking sensation during movement.

In this case, the correct answer is **B. Meniscus** because the test is specifically designed to detect tears or injuries to the menisci. McMurray's test is not applicable for evaluating the patella (A) or cartilage (C) injuries, which are assessed using other clinical tests. Injuries to the ankle (D) are unrelated to McMurray's test, as it is applicable to the knee joint, not ankle.

**Why Each Wrong Option is Incorrect:**

A. Patella (Kneecap) - McMurray's test is not applicable for patella injuries as it primarily assesses menisci, not patella. Patella injuries have different diagnostic tests, such as the Lachman test or the McMurray-Lachman test.

C. Cartilage - McMurray's test helps diagnose meniscus tears, not cartilage injuries. Diagnostic techniques for cartilage injuries include the McMurray test, Lachman test, and anterior drawer test.

D. Ankle - McMurray's test is specific to the knee joint and not applicable to the ankle joint. Ankle injuries require a different set of tests, such as the Apley's compression test, the O'Brien test, or the Blackfan test.

**Clinical Pearl:**

When assessing a patient with knee pain, a positive McMurray's test suggests a torn meniscus, which can lead to pain and clicking/clicking sensation during knee movement. An accurate diagnosis of meniscus tear is essential for appropriate treatment and prognosis. A thorough physical examination alongside the McMurray's test is crucial for a complete assessment of knee joint injuries.