Does os acromiale cause impingement?
Does os acromiale cause impingement?
Os acromiale is an uncommon cause of shoulder pain with symptoms often resulting from an unstable meso-acromion. The associated pain may be due to impingement from the unfused fragment, a concomitant rotator cuff tear, or gross motion at the os acromiale site.
What is os acromiale of the shoulder?
Os acromiale is a developmental aberration in which the distal acromion fails to fuse. This aberration is often discovered incidentally but may present with a clinical picture similar to that of subacromial impingement syndrome.
What is acromion process?
In human anatomy, the acromion (from Greek: akros, “highest”, ōmos, “shoulder”, plural: acromia) is a bony process on the scapula (shoulder blade). Together with the coracoid process it extends laterally over the shoulder joint. It articulates with the clavicle (collar bone) to form the acromioclavicular joint.
What does impingement in the shoulder mean?
Impingement syndrome describes a condition in which the tendons of the rotator cuff of the shoulder are pinched as they pass between the top of the upper arm (humerus) and the tip of the shoulder (acromion). The rotator cuff is a group of four muscles and bones that share a common tendon.
What age does the acromion ossify?
Acromial secondary ossification centers began forming at age 10 and clavicular ones, while uncommon, began forming at age 11. Fusion of acromial primary and secondary ossification centers began at age 14 and was generally complete after age 16.
What happens in shoulder impingement?
If you have shoulder impingement, your rotator cuff catches or rubs against the acromion. When you lift your arm, the space (bursa) between the rotator cuff and acromion narrows, which increases pressure. The increased pressure irritates the rotator cuff, leading to impingement.
Where is the AC joint?
What is the AC joint? The acromioclavicular, or AC, joint is a joint in the shoulder where two bones meet. One of these bones is the collarbone, or clavicle. The second bone is actually part of the shoulder blade (scapula), which is the big bone behind the shoulder that also forms part of the shoulder joint.
