NPTE Practice Questions - National Physical Therapy Examination Exam

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During a knee ligament exam, the PT performs the Lachman test at 20-30 degrees of knee flexion. What structure is this test designed to assess, and why is this position preferred over full extension?

The anterior cruciate ligament (ACL); this flexion angle relaxes the hamstrings and posterior capsule, making anterior tibial translation easier to detect The posterior cruciate ligament; full extension locks the joint and prevents assessment The medial collateral ligament; flexion isolates valgus stress The meniscus; flexion compresses the joint surfaces for palpation

Correct Answer:

The anterior cruciate ligament (ACL); this flexion angle relaxes the hamstrings and posterior capsule, making anterior tibial translation easier to detect

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