Shoulder keyhole surgery at The London Sports Injury Clinic
This picture shows a shoulder, which includes the gleno-humeral (ball and socket) joint. The acromion and the end of the clavicle form a bony arch over the top of the humerus. The space under the acromion is called the subacromial space. The structures within the space include the bursa (a lubricating structure) and the tendons of the rotator cuff muscles.Subacromial impingement occurs when bony changes occur either on the under surface of the acromion or the acromioclavicular joint. There is also inflammation in the bursa, which often becomes thickened.