You will benefit from understanding more about the bones that make up your knee joint, and the tissues and fluids that make movement comfortable. Your knee joint is composed of three bones: the lower end of the femur (thigh bone), the upper end of the tibia (shin bone) and the patella (kneecap).
The femur, tibia and patella are connected with tissue bands called ligaments, which help stabilize your knee. Another important part of the knee is cartilage, a smooth, plastic-like lining that covers the end of the bones and allows for more flexible, nearly frictionless movement. Cartilage keeps the end of the bones from rubbing against each other, and serves as a shock absorber against forces. The menisci are cushions in the medial and lateral compartments of your knee. They also act to stabilize the knee joint and absorb load. Lastly, you have synovium, which lines your joint and creates a lubricating fluid that reduces friction and wear.
In a healthy knee, these structures work together to ensure smooth, natural function and movement.