The knee is an intricate piece of biological machinery that scientists don't fully understand. This is particularly the case for sesamoid bones — small bones that are embedded in tendons or ...

when the knee bends, glides in a concave groove on the femur (the trochlea groove). The patella itself is a sesamoid bone, which is a bone embedded within a tendon. You also have sesamoid bones in ...

Another cause of posterior knee pain which is not as prevalent but every bit as painful is a sesamoid bone or an accessory bone (extra bone) in the calf musculature at it’s origin behind the knee.