The knee is a vulnerable joint. It bears a lot of stress from everyday activities, such as lifting and kneeling. It also bears stress from high-impact activities, such as jogging and aerobics.
The knee is formed by the following parts:
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Tibia. Shin bone or larger bone of the lower leg.
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Fibula. Smaller of the 2 lower leg bones.
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Femur. Thighbone or upper leg bone.
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Patella. Kneecap.
Each bone end is covered with a layer of cartilage that absorbs shock and protects the knee. Basically, the knee is 2 long leg bones held together by muscles, ligaments, and tendons.
There are 2 groups of muscles involved in the knee:
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Quadriceps muscles. These are on the front of the thighs. They work to straighten the legs.
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Hamstring muscles. These are on the back of the thighs. They bend the leg at the knee.
Tendons are tough cords of tissue that connect muscles to bones. Ligaments are elastic bands of tissue that connect bone to bone. Some ligaments on the knee provide stability and protection of the joints. Other ligaments limit forward and backward movement of the tibia or shin bone.
