Lachman's Test Procedure and Interpretation

The video tutorial explains how to perform the Lachman's test, a clinical procedure used to assess the integrity of the anterior cruciate ligament (ACL) in the knee. The test involves flexing the knee, relaxing the hamstring, and applying anterior force to the tibia while stabilizing the femur. The amount of anterior displacement and the firmness of the endpoint are evaluated to determine potential ACL injury. Comparing results with the opposite knee can help identify increased displacement or a soft endpoint, indicating an ACL injury.

What is the recommended knee flexion angle when starting the Lachman's test?

• 10-15 degrees

• 40-50 degrees

• 20-30 degrees

• 30-40 degrees

During the Lachman's test, what should the patient do with their hamstring muscles?

• Stretch them

• Relax them

• Contract them

• Tense them

Where should the examiner place their hands during the Lachman's test?

• One hand on the femur and the other behind the proximal tibia

• Both hands on the tibia

• Both hands on the femur

• One hand on the knee cap and the other on the ankle

What is the examiner looking for when pulling the tibia during the Lachman's test?

• The strength of the quadriceps

• The flexibility of the hamstring

• The amount of anterior displacement and firmness of the endpoint

• The rotation of the knee

What does increased displacement or a soft endpoint in the Lachman's test usually indicate?

• A patellar dislocation

• A PCL injury

• An ACL injury

• A meniscus tear