The knee joint is the largest and utmost complex joint in the human body. The knee is the joint where the femur and the large bone of the lower leg meets. The kneecap or Patella covers the knee joint. The knee moves like a hinge, but it can also move around and from side to side. The knee is more credible to be damaged than most other joints because it is subject to remarkable forces during energetic activity. Most of the knee damages that occur in football and other sports, consequence from twisting the joint. The knee ligaments are the toughest links between the femur and the tibia. Ligaments prevent the bones from moving out of position.
The patella (or kneecap) is a small, planer, trilateral bone in the forward-facing of the joint. It is not coupled with any other bone. Muscle attachments grasp it in place.