Anterior Drawer Test is used to diagnose tear of
**Core Concept**
The Anterior Drawer Test is a clinical examination used to assess the integrity of the **anterior cruciate ligament (ACL)** in the knee joint. It involves applying an anterior force to the tibia while the knee is in a flexed position, checking for excessive movement. This test is crucial for diagnosing **knee instability**.
**Why the Correct Answer is Right**
The correct answer is related to the ACL because the Anterior Drawer Test specifically evaluates the competence of the ACL. The ACL is a key ligament that prevents excessive anterior translation of the tibia relative to the femur. When the ACL is torn, the tibia can move more anteriorly than normal, which the Anterior Drawer Test can detect by the examiner's sense of movement and sometimes by patient report of a "clunk."
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because while the posterior cruciate ligament (PCL) is also a crucial stabilizer of the knee, the Anterior Drawer Test is not used to diagnose PCL tears.
**Option B:** Incorrect as the medial collateral ligament (MCL) and lateral collateral ligament (LCL) are assessed through different tests like valgus and varus stress tests.
**Option C:** Incorrect because the posterior drawer test is used for assessing PCL integrity, not the ACL.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the Anterior Drawer Test is most sensitive when the knee is flexed between 20 to 30 degrees, as this position maximizes the tension in the ACL, making it easier to detect abnormalities.
**Correct Answer:** D. Anterior Cruciate Ligament