## **Core Concept**
The menisci of the knee joint are cartilaginous structures that provide cushioning and stability. They are classified into medial and lateral menisci based on their location. The question focuses on the relative properties of the medial and lateral menisci that make one more prone to injury than the other.

## **Why the Correct Answer is Right**
The medial meniscus is more frequently injured than the lateral meniscus primarily because it is relatively **less mobile**. The medial meniscus is more firmly attached to the deep layer of the medial collateral ligament and the joint capsule, which limits its mobility. This reduced mobility makes it more susceptible to tears, especially during rotational injuries. In contrast, the lateral meniscus is more mobile due to its looser attachments, allowing it to move more freely within the knee joint.

## **Why Each Wrong Option is Incorrect**
- **Option A:** If the medial meniscus were relatively more mobile, it would imply that it has a lower chance of being injured compared to the lateral meniscus, which contradicts clinical observations.
- **Option B:** While the size and shape of the menisci do vary, the key factor in injury susceptibility is not merely being larger or smaller but how their attachments and mobility influence their function and stress distribution.
- **Option C:** The vascular supply does play a role in the healing potential of meniscal tears but is not the primary reason for the differing injury rates between the medial and lateral menisci.

## **Clinical Pearl / High-Yield Fact**
A memorable point for exams is that the medial meniscus is more commonly injured than the lateral meniscus, mainly due to its **limited mobility** and firm attachments. Clinically, meniscal tears often occur in the setting of twisting injuries, and the medial meniscus is particularly vulnerable.

## **Correct Answer:** . less mobile