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The knee is the largest joint in the human body and poses the connection between femur and tibia. It consists of three joint portions: the inner- (medial) and outer (lateral) joint portion between femur and tibia (femorotibial joint), the menisci which are lying in the intermediate joint space and at last the femoropatellar joint between patella and femur.

All joint portions are covered with a cartilage layer and are comprised by a common joint capsule. The synovial membrane produces a fluid that lubricates and nourishes the joint and together with the menisci has a shock absorbing effect. Ligamentous structures (e.g. cruciate- and collateral ligaments) between the bones stabilize the joint and muscles and tendons enable movements (whereby flexion and extension are the most important ones). When bending the knee there are furthermore small rotational movements possible.