Assess the integrity of the Anterior Cruciate Ligament (ACL) - full or partial tear. Anterior plane instability.
1. The patient lies supine with a firm bolster under the knee in 30-40 degrees of flexion.
2. The patient is encouraged to relax ensured that the examiner will not touch the knee.
3. The patient is asked to raise their heel off the table by actively extending their knee and then replacing their heel on the table and relaxing the quadriceps.
4. A positive test is noted by watching the lateral aspect of the knee to see if the lateral tibial plateau will gently subluxate or slide forward on the femoral condyle as extension is initiated (relative to the uninvolved side).
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