The knee is the large lower extremity joint connecting the femur and the tibia. The knee supports nearly the entire weight of the body and is vulnerable to both acute injury and the development of osteoarthritis.
The knee is a complex synovial joint that hovers and actually is comprised of two separate joints. The femoral-patellar joint consists of the patella, or "kneecap," which sits within the tendon of the anterior thigh muscle and the patellar groove on the front of the femur through which it slides.
On the other hand, the femoral-tibial joint links the femur, or thigh bone, with the tibia, the main bone of the lower leg. The joint consists of a viscous fluid which is contained inside the "synovial" membrane, or joint capsule. Behind the knee is called the popliteal fossa.
Furthermore, the knee bones are connected to the leg muscles by several tendons that move the joint. Ligaments join the bones and provide stability to the knee.
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