Quads active test
The quadriceps active test is performed with the knee flexed to 80 degrees and in neutral rotation. In a PCL deficient knee the starting point is with the tibia subluxed posteriorly under gravity.
The patient is asked to contract their quadriceps muscle ("straighten out your leg") while the examiner applies counter pressure against the ankle. The quadriceps pulls anteriorly through the tibial tubercle to visibly reduce the posterior translation of the knee.
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