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Adults over the age of 60 are more susceptible to a rotator cuff tear, with the overall frequency of tears increasing with age. [95] By the age of 50 10% of people with normal shoulders have a rotator cuff tear. [96] In an autopsy study of rotator cuff tears, the incidence of partial tears was 28%, and of complete rupture 30%.
[26] [27] Second, a computerized three-dimensional study failed to support impingement by any portion of the acromion on the rotator cuff tendons in different shoulder positions. [28] Third, most partial-thickness cuff tears do not occur on bursal surface fibers, where mechanical abrasion from the acromion does occur.
A torn rotator cuff can occur following trauma to the shoulder or it can occur through the "wear and tear" on tendons, most commonly the supraspinatus tendon found under the acromion. Rotator cuff injuries are commonly associated with motions that require repeated overhead motions or forceful pulling motions.
The injury may vary from mild inflammation to involvement of most of the rotator cuff. When the rotator cuff tendon becomes inflamed and thickened, it may get trapped under the acromion. Squeezing of the rotator cuff is called impingement syndrome. [citation needed] An inflamed bursa is called bursitis. Tendinitis and impingement syndrome are ...
Enthesopathy of the pelvis likely due to ankylosing spondylitis. Enthesopathy can occur at the shoulder, elbow, wrist, carpus, hip, knee, ankle, tarsus, or heel bone, among other regions.
Calcific tendinitis is a common condition where deposits of calcium phosphate form in a tendon, sometimes causing pain at the affected site. Deposits can occur in several places in the body, but are by far most common in the rotator cuff of the shoulder.