Rheumatoid arthritis (RA) is known for causing ... Two joints in the shoulder help it to move: the acromioclavicular joint ...

Medically reviewed by Jennifer Steinhoff, MD Collarbone pain is usually caused by an injury, such as a fracture or joint ...

All specimens were free of significant acromioclavicular joint arthritis. All specimens were disarticulated at the sternoclavicular joint, leaving the entire clavicle attached to the shoulder ...