Lachman’s Test

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Patient Position

  • Supine or seated
  • Knee flexed to 20-30°

Procedure Steps

  • Grab behind the proximal tibia and pull anteriorly (perpendicular to the tibia).
    • Stabilize the femur with one hand (so it doesn’t track forward).
  • Perform the same steps on the opposite (unaffected) knee.

Positive Sign / Significance

  • Increased anterior translation compared to the other side (or a mushy, soft end-feel) = Anterior cruciate ligament injury

Comments

  • When the knee is flexed to 90°, the hamstring tendons and iliotibial band also prevent anterior translation of the tibia in relation to the femur.  Therefore, this Lachman’s test is preferred over the anterior drawer test.

 

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