Lachman's Test | Rationale & Interpretation

The video tutorial explains Lachman's test, a special test for assessing ACL injuries. It compares Lachman's test with the anterior drawer test, highlighting differences in hand positioning and force application. The tutorial provides a step-by-step guide on performing Lachman's test, emphasizing the importance of proper technique and interpretation of results. It discusses the psychometric properties of the test, including sensitivity and specificity for acute and chronic ACL injuries. The video concludes with a review of the procedure and interpretation of Lachman's test results.

What is the primary purpose of the Lachman's test?

• To evaluate hip flexibility

• To measure knee extension

• To test ankle stability

• To assess the integrity of the ACL

During the Lachman's test, what is the correct position for the patient's foot?

• Crossed over the other leg

• Elevated above the table

• Flat on the table or at least the heel planted

• Hanging off the edge of the table

What indicates a positive Lachman's test?

• Painful firm end feel

• No movement of the tibia

• Excessive anterior tibial translation with a mushy end feel

• Painless firm end feel

What should be the position of the PT's hands during the Lachman's test?

• One hand on the knee and the other on the ankle

• One hand on the femur and the other on the proximal calf

• Both hands on the patient's foot

• Both hands on the patient's femur

How does the sensitivity of the Lachman's test for chronic ACL injuries compare to the anterior drawer test?

• Lachman's test has lower sensitivity

• Both tests have the same sensitivity

• Lachman's test has higher sensitivity

• Anterior drawer test has higher sensitivity

What is the specificity of the Lachman's test for both acute and chronic ACL injuries?

• Exactly 85%

• Between 50% and 75%

• Less than 50%

• Greater than 95%

What is a key characteristic of a normal Lachman's test result?

• Painful with a mushy end feel

• Painless with a firm end feel

• No movement of the tibia

• Excessive movement with a firm end feel