The fabella, a small bone in a tendon behind the knee, was lost over the course of early human evolution, but these days it’s becoming more common, according to a study published this week (April 17) ...

It also twists and rotates. To do all of these things and support your body while doing so, the knee relies on several structures. They include bones, ligaments, tendons, and cartilage.

Skeletal muscle is joined to bones. Its cells contract to make bones move and joints bend. The knee joint has two muscles that move the shin up or down. These are the hamstrings and the quadriceps.

From the skull to the smallest bone in your pinky toe, the skeleton acts as internal scaffolding to give stability to the body, and forms protective cocoons around important organs. Despite their ...