The Meniscus: What It Is and Why It Matters The meniscus is a C-shaped piece of fibrocartilage that sits between your thighbone (femur) and shinbone (tibia). Each of your knees has two menisci - the medial meniscus on the inner part of the knee and the lateral meniscus on the outer part. These structures are crucial for several reasons: - Weight Distribution: The meniscus distributes about 50% of the total load in the knee joint when standing, increasing to 85% when you bend your knee by 90 degrees.
- Shock Absorption: It acts as a natural shock absorber, cushioning the impact of your movements.
- Joint Stability: The meniscus contributes to the overall stability of your knee, working with your ligaments to prevent excessive movement.
- Friction Reduction: It helps reduce friction during movement, allowing for smooth knee motion.
- Joint Protection: By absorbing shock and distributing weight, the meniscus helps protect the articular cartilage on the ends of your bones from excessive wear.
The outer third of the meniscus (the "red zone") has a good blood supply, aiding in healing, while the inner two-thirds (the "white zone") lacks blood supply, making injuries in this area more challenging to heal. A healthy meniscus is vital for maintaining knee function and preventing long-term issues like osteoarthritis. It's particularly crucial for those of us who love to stay active, as it helps absorb shock during high-impact activities. |