Final answer:
The medial meniscus is more prone to injury because it is less mobile, being anchored to the tibial collateral ligament. The physical attachment contributes to the risk, as a blow to the lateral knee can stretch or damage the medial meniscus along with the tibial collateral ligament.
Step-by-step explanation:
The medial meniscus is more prone to injury, specifically because it is less mobile compared to the lateral meniscus. This lack of mobility is due to the medial meniscus being attached to the tibial collateral ligament. A moderate blow to the lateral knee can cause the medial side of the joint to widen, which stretches or damages the tibial collateral ligament, and since the medial meniscus is attached to this ligament, it is more likely to be injured.
Additionally, the medial meniscus is anchored to the articular capsule, limiting its movement even more, and causing it to be 20 times more susceptible to injury than the lateral meniscus. Unfortunately, some areas of the meniscus lack an arterial blood supply, which results in poor healing if the meniscus is damaged.