The healthy shoulder joint allows us to move our arms a full 270 degrees in range, which no other joint can do. When you consider the shoulder’s range of motion and its complexity, it’s no wonder that this joint is particularly prone to injury. However, there are some steps you can take to help prevent shoulder damage.
The anatomy of the shoulder involves not only the ball-and-socket type glenohumeral joint that most people are familiar with (which allows for a wide range of movement), but three other joints as well, all supported by tendons and ligaments. These four joints are composed of the glenohumeral, scapulothoracic, acromioclavicular and sternoclavicular joints. The two clavicular joints are not very mobile, so injuries to these are often the cause of shoulder complaints. But because the glenohumeral and scapulothoracic joints have such a wide range of motion, the supporting tendons and ligaments are more prone to injury.
Posted by Dr. Babak Missaghi