The McMurray test is a physical examination technique used by healthcare providers to diagnose a torn meniscus in the knee. It involves a series of specific movements of the knee and leg to assess for the presence of a tear. This in-office exam requires no special equipment.
How the McMurray Test Works
The test is performed with the patient lying on their back. The examiner then performs a series of rotations of the tibia (lower leg bone) while applying pressure to the knee. A "click" or "pop" sound, along with pain, can be indicative of a meniscal tear. The specific movements involve internally and externally rotating the tibia while flexing and extending the knee.
Interpreting the Results
A positive McMurray test suggests a likely meniscal tear. However, it's important to note that a negative test doesn't entirely rule out a tear, and a positive test isn't definitive proof on its own. Other diagnostic tools may be used to confirm the diagnosis. The test's accuracy is moderate in confirming a diagnosis but weaker in ruling it out. Studies have shown a high false positive rate, particularly in patients with a low pre-examination likelihood of a meniscus tear.
Additional Information
- The McMurray test is also known as the McMurray circumduction test.
- It's often used in conjunction with other tests, such as the Apley's compression test and Thessaly test, for a comprehensive evaluation.
- Clinicians use the results of the McMurray test to inform decisions about patient care.
