Lachman Test for ACL Tears The original Lachman test is performed like shown in the video. if you have small hands, an alternative is to put your own bent knee under the patient's knee to stabilize the 30° of knee flexion. An alternative is to have the patient in prone lying position and anteriorly translate the knee in 30° of flexion. The Lachman Test is the most accurate test for the anterior cruciate ligament according to literature. According to a meta-analysis of Benjaminse et al. (2006) th