Lachman

Lachman test is a clinical test used in the diagnosis of an anterior cruciate ligament (ACL) injury. It is named after the orthopedic surgeon, John Lachman, who introduced it.

Procedure

The Lachman test is performed with the patient lying supine, the knee flexed at 20-30 degrees and the examiner stabilizing the distal femur with one hand, while the other hand pulls the proximal tibia forward. A positive Lachman test indicates a torn ACL.

Accuracy

The Lachman test is considered to be the most reliable clinical test for the diagnosis of ACL tears. It has a sensitivity of 85% and a specificity of 94%.

Comparison with other tests

Other tests for ACL tears include the Anterior drawer test and the Pivot shift test. However, the Lachman test is generally considered to be more accurate than these tests.

See also

• Anterior cruciate ligament injury
• Knee examination

References

Lachman Resources
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