Knee Stability Tests

Knee Stability Tests

1. Anterior Instability

   • Anterior Drawer Test
     • Positive: Sprain of anteromedial bundle of the ACL or complete tear of ACL
   • Lachman's Test
     • Increase amount of anterior tibial translation compared with the uninvolved limb or the lack of a firm end-point
   • Prone Lachman's Test
     • Excessive anterior translation relative to the uninvolved knee indications a sprain of the ACL

2. Posterior Instability

   • Posterior Drawer Test
     • increased amount of posterior tibial translations compared with the opposite limb or the lack of a firm endpoint
   • Godfrey's Test
     • Unilateral posterior displacement of the tibial tuberosity

3. Medial Instability

   • Valgus Stress Test: 0* Flexion
     • increased laxity, decreased quality of the end-point, and /or pain compared with the uninvolved
   • Valgus Stress Test: 25* Flexion
     • Isolates the MCL

4. Lateral Instability

   • Varus Stress Test: 0* Flexion
     • Increased laxity, decreased quality of the end-point, and or pain compared
   • Varus Stress test 25* Flexion
     • Isolates the LCL