JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Knee joint. Illustration showing bones and tendons of the human knee (genual) joint. The knee is the largest joint in the human body. It forms the point of articulation between the upper leg bone (femur, at top) and the two bones of the lower limb (tibia at lower left, fibula at lower right). The articulation surface is formed from condyles (round bone ends) between the femur and tibia. These condyles are covered in cartilage (white) to prevent friction on movement. Ligaments (pink) fix this joint together: a fibular collateral ligament attaches the fibula to femur; cruciate ligaments attach tibia to femur between the condyles. The oval knee cap bone (patella) protects the joint.
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