**Core Concept**
A torn medial meniscus is a common injury in the knee, often associated with valgus stress or twisting injuries. The medial meniscus is a C-shaped cartilage structure that provides cushioning and stability to the knee joint. A tear can cause mechanical symptoms, such as locking or catching, and can also lead to instability and giving way.

**Why the Correct Answer is Right**
McMurray's sign is a clinical test used to diagnose meniscal tears, including medial meniscus tears. It involves flexion and extension of the knee while applying valgus stress, which can reproduce the patient's symptoms. A positive McMurray's sign is indicative of a meniscal tear, making option **d)** McMurray's sign a feature consistent with a torn medial meniscus.

**Why Each Wrong Option is Incorrect**
* **Option A:** Excessive forward glide is a feature that can be associated with a torn anterior cruciate ligament (ACL), not a torn medial meniscus. A torn ACL can cause the femur to glide excessively forward on the tibia.
* **Option B:** Giving way is a symptom that can be associated with a torn medial meniscus, as the meniscus provides stability to the knee joint. A tear can lead to instability and giving way.
* **Option C:** Locking is a common symptom associated with a torn medial meniscus, as the torn cartilage can get caught between the bones, causing the knee to lock.

**Clinical Pearl / High-Yield Fact**
A torn medial meniscus can be diagnosed using the McMurray's sign, which involves flexion and extension of the knee while applying valgus stress. A positive test can indicate a meniscal tear, but it is essential to consider other knee injuries, such as ACL tears, when evaluating patients with knee symptoms.

**Correct Answer:** D. McMurray's sign