Posterior shoulder dislocation occurs when the top of the upper arm bone, known as the humerus, moves backward out of its socket. This causes pain, muscle spasms, and a limited range of motion. The ...
The collarbone, or clavicle, is a long, thin bone between the breastbone or sternum and the shoulder. A collarbone dislocation occurs when the collarbone moves out of its usual position, often due to ...