SLOCUM TEST WITH

INTERNAL TIBIA ROTATION

​• Test positioning

The client lies supine with the test hip flexed to 45-degrees, knee flexed to 90-degrees, and tibia internally rotated 15 to 20 degrees.

The therapist sits on the client's foot with both hands behind the client's proximal tibia and thumbs on the tibial plateau.

​• Action

Apply an anterior force to the proximal tibia.

The hamstring tendons should be palpated frequently with the index fingers to ensure relaxation.

​• Positive finding

Increased anterior tibial displacement, particularly of the lateral tibial condyle, as compared to the uninvolved side is indicative of anterolateral rotary instability (secondary to a partial or complete tear of primarily the ACL and posterolateral capsule).

​• Special considerations & comments

The therapist must avoid maximally rotating the tibia, as this will tighten most of the surrounding structures and create a high potential for false-negative findings.

The Slocum Test with Internal Tibia Rotation is credited to Dr. Donald Slocum for his work in understanding knee instability and ligament function, with further contributions from Dr. James Cyriax in refining its diagnostic use.