The Lachman’s test is an orthopaedic test used to diagnose injury to the anterior cruciate ligaments (ACL) and posterior cruciate ligaments (PCL).
Patient supine with knee bent 15°-30°.
- Lachmans Anterior: examiner stabilizes the patient’s femur with one hand and then pulls the tibia anteriorly with the other hand
- Lachman’s Posterior: same procedure except repeated with the examiner pushing the tibia posteriorly
Anterior translation of more than 2mm of the tibia suggests a ruptured ACL (Often with a soft end fell).
Positive Lachman’s Test
Pain with normal anterior translation: ACL sprain.
Pain with increased anterior translation: ACL rupture.
Pain with normal posterior: PCL sprain.
Pain with increased posterior: PCL rupture
This procedure is considered the gold standard for the evaluation of anterior cruciate and posterior cruciate knee ligament damage.