A focal nerve lesion produced by constriction or mechanical distortion of the suprascapular nerve, within a fibrous or fibrosseous tunnel, or by a fibrous band.
Symptoms:
Pain and discomfort that is poorly localized, often in the top or back of the shoulder
Heaviness or fatigue of the shoulder and arm
Pain that may be made worse by exercise or raising the arm over head
Weakness raising the arm to the side or overhead or rotating the shoulder outward
Tenderness in the top or back of the shoulder
Atrophy of the supraspinatus or infraspinatus muscle
Causes:
Pressure on the supraspinatus nerve at the top or back of the shoulder, often by a cyst from the shoulder joint
Pressure on the supraspinatus nerve at the top or back of the shoulder by one of two ligaments of the shoulder blade that the nerve passes beneath
