DEPT. OF CLINICAL RADIOLOGY, SALISBURY DISTRICT HOSPITAL / SCIENCE PHOTO LIBRARY DEPT. OF CLINICAL RADIOLOGY, SALISBURY DISTRICT HOSPITAL / SCIENCE PHOTO LIBRARY
Normal knee. Coloured X-ray of a knee, showing the joint between the femur or thigh-bone (top) and tibia (the larger bone at bottom). The patella, also known as kneecap, is visible at centre left. This is a triangular bone which lies at the front of the knee and is held in position by the lower end of the quadriceps muscle and by the patellar tendon, which attaches the patella to the tibia. Two discs (unseen) of cartilage, the menisci, cover the end of the femur and tibia. They reduce the friction between the bones during movement and increase the stability of the knee. The fibula is the thin bone at bottom right.
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