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The Slocum’s test is used to detect the presence of anteromedial rotary instability and anterolateral rotary instability of the knee. This test is also called the anteromedial and anterolateral rotary instability tests.
The Slocum’s test is performed in two parts and for both, the patient lies supine with the hips flexed to 45˚ and the knees flexed to 90˚.
Part 1: To test for anteromedial rotary instability, the foot of the involved side is turned laterally about 15 degrees. Sit across the dorsum of the foot to stabilize its position while grasping the tibia and resting the thumbs on either side of the patellar tendon. Pull the upper leg forward and observe and feel for the extent of forward displacement of the medial tibial condyle. This part of the test is sometimes called Lemaire’s T Drawer test.
The test is positive if the forward movement of the tibia occurs primarily on the medial side of the involved knee and this movement is excessive relative to the uninvolved knee. When positive, the test indicates possible injury to a number of structures including:
- Anterior cruciate ligament
- Posteromedial capsule
- Medial collateral ligament
- Semimembranosus tendon
- Posterior oblique ligament
Part 2: To test for anterolateral rotary instability, the procedure is repeated with the foot turned medially about 30 degrees.
The test is positive if the forward movement of the tibia occurs primarily on the lateral side and this movement is excessive relative to the uninvolved knee. When positive, the test indicates possible injury to a number of structures including:
• Anterior cruciate ligament
• Posterolateral corner structures including:
- Arcuate-popliteus complex
- Lateral collateral ligament
- Biceps femoris tendon
- Posterolateral capsule
- Iliotibial band
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