Lateral McMurray Test

Lateral McMurray test is used to check for injury to the lateral meniscus of the knee joint. It…
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 Lateral McMurray Test

What is Lateral McMurray Test?

  • Lateral McMurray test is used to check for injury to the lateral meniscus of the knee joint. It was originally developed to diagnose posterior horn lesions of the medial meniscus.

How it's Performed?

  • Patient is supine with the affected hip and knee flexed.
  • Examiner cups one hand over the patient’s knee ( palm over the patella and fingers/thumb over the joint line).
  • Examiner grasps patient’s heel with the other hand
  • Then slowly extends the patient’s knee, while applying internal rotation of the tibia and varus stress on the knee to assess lateral meniscus.

What does a positive Lateral McMurray Test mean?

  • Lateral McMurray test is Positive when there is a click (or catch) and pain in the extension of the knee. (A negative test does not completely rule out meniscal tear).
  • By maneuvering this way we are producing a suction force to displace an unstable lateral meniscal tear which gets caught between the articular surfaces and causes pain.

Sensitivity & Specificity

  • Sensitivity: 54 %
  • Specificity: 79 %

Notes

  • Meniscus of the Knee is a crescent shape structure, triangular in cross section, that cover one half to two thirds of the articular surface of the corresponding tibial plateau.
  • There are two Meniscus in the knee, Medial Meniscus and Lateral Meniscus.
  • 50% of medial tibial plateau covered by medial meniscus, whereas 59% of lateral tibial plateau covered by lateral meniscus.

Lateral Meniscus:

  • The lateral meniscus of the knee is more circular in form, covering up to two thirds of the articular surface of the underlying tibial plateau.
  • The tendon of the popliteus muscle separates the posterolateral periphery of the lateral meniscus from the joint capsule and the fibular collateral ligament.
  • It’s more mobile than the medial meniscus.
  • The average width is 10 to 12 mm, and the average thickness is 4 to 5 mm.
  • It’s less likely to be injured because:
    • It is firmly attached to the popliteus muscle and to the ligament of Wrisberg or of Humphry, which make it follows the lateral femoral condyle during rotation.
  • Acute lateral meniscus tears are more common associated with Anterior Cruciate Ligament Injury.

Reference

  • Orthobullets
  • NCBI
  • Ockert B, Haasters F, Polzer H, et al. [Value of the clinical examination in suspected meniscal injuries. A meta-analysis]. Unfallchirurg. 2010;113(4): 293-299
  • Meserve BB, Cleland JA, Boucher TR. A meta-analysis examining clinical test utilities for assessing meniscal injury. Clin Rehabil. 2008;22:143-161
  • Hegedus EJ, Cook C, Hasselblad V, et al. Physical examination tests for assessing a torn meniscus in the knee: a systematic review with meta-analysis. J Orthop Sports Phys Ther. 2007;37:541-550
  • Konan S, Rayan F, Haddad FS. Do physical diagnostic tests accurately detect meniscal tears? Knee Surg Sports Traumatol Arthrosc. 2009;17(7):806-811

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