pivot shift phenomenon

pivot shift phenomenon
a sign of anterior cruciate ligament disruption: with the knee held at 20° flexion and in neutral rotation and with the muscles relaxed (which lets the femur drop down if the anterior cruciate ligament is torn), a slight valgus or axial force is applied to the knee; subluxation or reduction of the tibia occurs if the anterior cruciate ligament is torn. Called also pivot shift sign or test.

Medical dictionary. 2011.

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