![]() ![]() ![]() When a knee cannot be bent or straightened, it is called a locked knee. When a knee is unable to perform those functions, it impacts mobility and the ability to complete daily living activities, such as sitting, standing, squatting, or kneeling. ![]() Knees are designed to bend up and down, and to rotate slightly. In addition, two C-shaped pieces of cartilage-the medial and lateral menisci-provide a cushion between the femur and tibia, acting, in effect, as shock absorbers. Tendons connect these bones to the leg muscles, while ligaments connect the knee bones to each other and make the knee stable. It connects the thigh bone (femur) to the shin bone (tibia), and also includes a smaller bone, the fibula, which is located next to the tibia, and the knee cap (patella). The knee is one of the most complex joints in the human body.
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