Assesses for instability of the anterior cruciate ligament (ACL).

Performing the Test

  1. Patient supine, knee relaxed in 15°-30° of flexion
  2. Grasp distal femur with left hand, proximal tibia with right, ensuring left thumb is on joint line
  3. Stabilizing femur, apply anterior pressure to posterior tibia
  4. Positive: greater anterior tibial displacement on affected side compared to unaffected side
  5. Compare both knees
  6. Sensitivity: 87%; specificity: 60%
  7. LR+ = 9.4; LR- = 0.23


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