Other Known Aliases – none
Definition – passive accessory movement test of the knee performed to identify the integrity of the anterior cruciate ligament
Clinical Significance – Place the patient’s knee in about 20-30 degrees flexion and externally rotated slightly. The examiner should place one hand behind the tibia and the other on the patient’s thigh. It is important that the examiner’s thumb be on the tibial tuberosity. On pulling the tibia anteriorly, an intact ACL should prevent forward translational movement of the tibia on the femur. A positive test is > 2mm of movement compared to the unaffected knee.
History – Named after John Lachman (1919-2007), who was an American orthopaedic surgeon and received his medical doctorate from the Temple University School of Medicine in 1945. He was described as a prolific teacher, mentor, and surgeon making his mark across students, faculty, and patients over illustrious career. As a testament to this, his eponymous test was published by one of his colleagues who named and attributed it to him in 1987.
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