The top of the humerus is part of the shoulder joint, and the bottom of the humerus is part of the elbow joint. Muscles move the humerus. The humerus is your upper arm bone. It is the only bone in ...

Related: Anatomy of the Human Shoulder Joint People with RA who have shoulder involvement will have pain in both shoulders.

A hinge joint is a type of synovial joint that works like the hinge on a door, allowing bending and straightening only. The shoulder and hip joints are both ball and socket joints. A ball and ...

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 ...