Shoulder injuries and different types of arthritis may cause acromioclavicular (AC) joint pain. The AC joint in the shoulder connects the collarbone to part of the shoulder blade. One of the AC ...

You’ve been told that exercise is essential for healthy joints. Maybe you dutifully hit the gym a few times a week or take a daily walk to keep your body moving. But what about the other 23 hours of ...

Flexion and extension refer to directions of motion that affect the angle of a joint. Flexion is when the joint is closed, while extension is when it is opened. Flexion and extension are the two ...