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.

类似问题

The anterior cruciate ligament extends from the lateral condyle of the femur to the _____.

Which of the following ligaments is stretched or torn in about 70% of all serious knee injuries?

When evaluating a new project, firms should include in the projected cash flows all of the following EXCEPT:

Provide the best rationale for what's wrong with supply chains today?

What is Blockchain and how is it relevant to supply chain management?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单