What does a positive McMurray's test indicate?

A positive McMurray's test is a clinical assessment used to evaluate the integrity of the meniscus in the knee joint. When performing this test, the examiner flexes and rotates the knee while applying a varus or valgus stress. A positive result occurs when a palpable or audible click, pain, or a sense of locking is felt during the maneuver, which typically indicates a meniscal tear.

The meniscus is crucial for load distribution and stability in the knee, and tears can lead to significant pain and impaired function. Therefore, when the test yields positive results, it is strongly suggestive of meniscal damage rather than issues related to the tibia, ACL, or ligaments more generally.

Understanding the mechanism of the McMurray's test and the significance of the movements involved provides insight into why a positive finding directs attention specifically to the meniscus rather than other structures.