Patient is laying supine on their back with knee flexed. Clinician pulls tibia anteriorly while keeping the femur and the foot stable as pictured below creating an anterior translation of the tibia.

Which of the following structures is this clinical procedure would testing the integrity of?

Question

Patient is laying supine on their back with knee flexed. Clinician pulls tibia anteriorly while keeping the femur and the foot stable as pictured below creating an anterior translation of the tibia.

Which of the following structures is this clinical procedure would testing the integrity of?

BlackTom AI · Accepted Answer

The scenario describes the patient lying supine with the knee flexed and the clinician pulling the tibia anteriorly while the femur and foot are stabilized, producing anterior translation of the tibia. This is a classic setup for assessing the integrity of the ACL, which resists anterior translation of the tibia relative to the femur.

Why this option is correct:
- The anterior cruciate ligament (ACL) primarily prevents the tibia from sliding forward (anterior translation) relative to the femur. When the clinician manually pulls the tibia forward with the femur stabilized, a positive test (increased anterior laxity or failure to restrain anterior movement) suggests a compromised ACL.
- The described mechanism corresponds to the anterior drawer test or a similar ACL-specific assessment, which targets the restraint provided by the ACL to anterior tibial movement.

Why other potential options (if presented) would typically be incorrect for this specific test:
- Posterior cruciate ligament (PCL): The PCL resists posterior translation of the tibia. A test that translates the tibia anteriorly wouldn’t primarily assess PCL integrity, and a positive PCL issue would more likely be revealed by a posterior drawer test.
- Lateral collateral ligament (LCL) or Medial collateral ligament (MCL): These ligaments stabilize the knee against varus and valgus stresses, respectively. They are not the primary restraints against anterior tibial translation, so this anterior translation test would not predominantly evaluate the collateral ligaments.
- Menisci: Although meniscal injuries can co-occur and affect knee stability, the anterior translation test is not a direct assessment of meniscal integrity. Meniscal tests (e.g., McMurray, Apley) probe the menisci more specifically.

In summary, the mechanism described directly targets the ACL’s role in preventing forward tibial movement, making anterior cruciate ligament integrity the correct focus of this clinical procedure.

2261 REHSCI 1200 SEC1010 Lecture Exam 1- Requires Respondus LockDown Browser

Patient is laying supine on their back with knee flexed. Clinician pulls tibia anteriorly while keeping the femur and the foot stable as pictured below creating an anterior translation of the tibia. Which of the following structures is this clinical procedure would testing the integrity of?

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