Ball and socket joints also allow flexion and extension. Flexion of the shoulder joint occurs when the humerus (upper arm) moves forwards from the rest of the body, which happens at the end of an ...

This occurs when the angle of a joint increases, for example, at the elbow when putting a shot. Abduction – movement away from the midline of the body. This occurs at the hip and shoulder joints ...

The rotator cuff provides stability for the shoulder joint and is responsible for rotating the arm both internally and externally. Most tennis players who experience shoulder pain present with one ...