Category: Orthopedics
Keywords: Posterolateral Corner Injury, PCL, ACL, knee (PubMed Search)
Posted: 6/13/2015 by Brian Corwell, MD
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Hx: hyperextension injury (contact and non contact), varus directed blow to flexed knee, direct blow to anteriomedial knee. Report instability symptoms when knee is in full extension.
PE: Varus stress testing
Varus laxity at 0 indicate LCL and cruciate ligament (ACL/PCL) injury
Varus laxity at 30 indicates LCL injury
Dial test - inspects the external rotation at the knee joint/performed in both 30 and 90 knee flexion. The dial test inspects the external rotation at the knee joint
https://www.youtube.com/watch?v=pW4yv0zg4RY
Positive at 30 = > 10 external rotation asymmetry = isolated PCL injury
Positive at 30 & 90 = Posterior lateral corner injury and PCL injury