A 25-year-old boy presented with complaints of pain and swelling around the right knee along with loss of full range of motion and discomfo while walking. On examination, tenderness was elicited along the joint line for 2 days. The patient had a history of fall while playing football 2 days back. X-ray of the knee was done. The doctor also conducted a test which is shown below. This is used to check the integrity of which ligament of knee: –

**Core Concept**
The underlying principle being tested involves the assessment of knee joint stability, specifically focusing on the integrity of ligaments surrounding the knee. This is crucial in the diagnosis and management of knee injuries, particularly those sustained during sports activities. The **anterior cruciate ligament (ACL)** and **posterior cruciate ligament (PCL)** are key structures often evaluated in such scenarios.

**Why the Correct Answer is Right**
Given the context of a fall during football and subsequent symptoms, the test in question is likely designed to assess the integrity of the **anterior cruciate ligament (ACL)**. The ACL is commonly injured in sports-related activities, especially those involving sudden stops, changes in direction, or direct blows to the knee. The mechanism of injury often involves a combination of valgus stress, rotational force, and deceleration, which can lead to ACL rupture. A specific test, such as the **Lachman test** or **anterior drawer test**, would be used to evaluate ACL integrity.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because, without the specific details of the test, we cannot assume it targets any ligament other than the ACL based on the provided context.
**Option B:** Similarly, this option is incorrect as the description does not match a test specifically for another ligament without further details.
**Option C:** This choice is also incorrect for the same reason; the test's description is not provided to accurately determine its target.
**Option D:** Without the description of the test, this option cannot be considered correct based on the information given.

**Clinical Pearl / High-Yield Fact**
In knee injuries, especially those involving sports, the ACL is a commonly affected structure. The **Lachman test** is highly sensitive for detecting ACL injuries and is often preferred over the anterior drawer test due to its higher sensitivity, especially in acute settings.

**Correct Answer:** Correct Answer: D. Anterior Cruciate Ligament

✓ Correct Answer: D. PA F