Your knees are among the largest joints in your body and are under intense weight-bearing strain and used daily–no wonder they hurt sometimes.
The knee joint joins your thigh bone (femur) and your shin bone (tibia). The fibula bone runs alongside the tibia and, along with the kneecap (patella), make up the rest of the bones in the knee. Two c-shaped pieces of cartilage, the medial and lateral menisci, act as shock absorbers between femur and tibia.
The knee joint is the most complex in the body. It’s a “condylar” joint, meaning it has two protrusions on the femur (called condyles) and the the tibia has two grooves which enable them to roll and slide against each others. Because of it’s unique structure, it’s also a hinge joint.