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Using the Lachman’s Test to assess ACL stability

This is an excerpt from The Pocket Atlas of Special Tests for the Lower Limb by Jane Johnson.

Figure 8.5: Lachman’s Test.

Purpose: This is used to assess stability of the anterior cruciate ligament.

Type of Test: This is a passive joint movement test.

Procedure: With your client in the supine position, stand to the side of the symptomatic knee. The test is performed with the knee in 20° to 30° of flexion. Grasp the proximal end of the leg over the tibial tuberosity with one hand, and with your other hand grasp the distal end of the thigh so that you have good leverage on the knee joint. Whilst stabilizing the femur, draw the tibia anteriorly (figure 8.5). Compare the amount of anterior/posterior translation with that of the asymptomatic knee.

Findings: A positive test is indicated by increased laxity in the joint compared with the asymptomatic side.

Tip: Sokal et al. (2022) provide a useful systematic review and meta-analysis of tests for the anterior cruciate ligament, including Lachman’s Test.

More Excerpts From The Pocket Atlas of Special Tests for the Lower Limb

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