**Core Concept:** The knee joint is a synovial joint, consisting of the femur, tibia, and patella, with the menisci acting as shock absorbers and stabilizers. The menisci are C-shaped structures that fit between the femur and tibia. There are two menisci in the knee joint, the medial meniscus and the lateral meniscus.

**Why the Correct Answer is Right:** The medial meniscus is more susceptible to injury due to its location and function. The medial meniscus is situated in a more central position in the knee joint, which increases its contact with the tibia and femur, making it more prone to stress and strain. Additionally, the medial meniscus plays a crucial role in stabilizing the medial side of the knee, which increases its load-bearing capacity and consequently, the risk of injury.

**Why Each Wrong Option is Incorrect:**

A. **Not related to meniscus structure or function:** This option does not address the specific factors contributing to the increased injury risk of the medial meniscus compared to the lateral meniscus.

B. **Not related to meniscus location:** Although the lateral meniscus is less central, its location is not the primary reason for the medial meniscus being injured more often.

C. **Not related to meniscus function:** While both menisci have stabilizing functions, this option does not explain the specific reason for the medial meniscus being injured more often.

D. **Related to meniscus structure:** This option mentions the structure of the menisci, but does not explain the specific reason for the medial meniscus being injured more often.

**Clinical Pearl:** In clinical practice, understanding the meniscus anatomy and function is crucial for diagnosing and treating meniscal injuries. A thorough physical examination should consider the patient's age, mechanism of injury, and joint stability to assess the severity and location of the meniscal injury. An MRI scan is often required for a precise diagnosis of meniscal tears.

**Correct Answer Explanation:** The correct answer (option D) highlights the meniscus structure, specifically mentioning that the medial meniscus is more susceptible to injury due to its 'C-shaped' structure, which increases the contact area and load-bearing capacity, making it more prone to injury. This option correctly explains the increased injury risk of the medial meniscus in the context of its structure and function.