Positive Lachman's Test



The Lachman test is a clinical test used to diagnose injury of the anterior cruciate ligament (ACL). It is recognized as reliable, sensitive, and usually superior to the anterior drawer test.



The knee is flexed at 20–30 degrees with the patient supine. The examiner should place one hand behind the tibia and the other grasping the patient's thigh. It is important that the examiner's thumb be on the tibial tuberosity. The tibia is pulled forward to assess the amount of anterior motion of the tibia in comparison to the femur.



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