Which test is designated to assess the anterior cruciate ligament (ACL)?

Which test is designated to assess the anterior cruciate ligament (ACL)?

• A. Varus stress test
• B. Lachman's test
• C. Valgus stress test
• D. Patellar tilt test

Answer: (B)

Lachman's test is specifically designed to assess the integrity of the anterior cruciate ligament (ACL), making it the correct choice for this question. This test is particularly useful because it provides a reliable and sensitive method for evaluating ACL injuries. During the Lachman's test, the patient's knee is placed in a slight flexion, typically around 20 to 30 degrees. The examiner stabilizes the femur with one hand while using the other hand to pull the tibia forward. A significant amount of anterior translation of the tibia relative to the femur indicates a potential ACL tear. The other tests listed do not specifically evaluate the ACL. The varus stress test assesses the integrity of the lateral collateral ligament, while the valgus stress test evaluates the medial collateral ligament. The patellar tilt test is unrelated to ligamentous stability but instead assesses the mobility and position of the patella. Thus, Lachman's test is critical for diagnosing ACL injuries in clinical practice.

Lachman's test is specifically designed to assess the integrity of the anterior cruciate ligament (ACL), making it the correct choice for this question. This test is particularly useful because it provides a reliable and sensitive method for evaluating ACL injuries. During the Lachman's test, the patient's knee is placed in a slight flexion, typically around 20 to 30 degrees. The examiner stabilizes the femur with one hand while using the other hand to pull the tibia forward. A significant amount of anterior translation of the tibia relative to the femur indicates a potential ACL tear.

The other tests listed do not specifically evaluate the ACL. The varus stress test assesses the integrity of the lateral collateral ligament, while the valgus stress test evaluates the medial collateral ligament. The patellar tilt test is unrelated to ligamentous stability but instead assesses the mobility and position of the patella. Thus, Lachman's test is critical for diagnosing ACL injuries in clinical practice.