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Anatomy of the knee joint

BONES

Femur (Thigh Bone)
The femoral condyles are the two rounded prominences at the end of the femur; they are called the medial and the lateral femoral condyle, respectively. The motions of the condyles include rocking, gliding and rotating. Any abnormal surface structure or cartilage damage can lead to cartilage breakdown and arthritis (loss of cartilage padding).

Tibia (Shin Bone)
The Tibia meets the Femur at the knee in two areas on which the Femur rides. This area called the Tibial Plateau is divided into a medial (inside of your knee) and a lateral (outside) part.

Patella (Knee Cap)
The Patella is a bone that lies within the quadriceps tendon. It rides in the shallow groove over the front part of the Femur called the Trochlea. The Patella acts as a lever arm to help the quadriceps muscle extend the knee.

Several bones meet to form the knee joint; it consists of the femur, tibia and patella. These bones are held together by ligaments, which connect two bones to each other, and tendons, which connect a muscle to a bone.