Shoulder Entrapment

The head of the humerus is held within the glenoid cavity of the scapula by a musculotendinous group, forming the ball-and-socket joint.  

Shoulder entrapment is caused when the supraspinatus tendon is rubbed and compressed between the humerus and the osteoligamentous ceiling created by the inferior surface of the acromion.  

The serous bursa will then cause inflammation, which will reduce the friction that is caused by the tendon rubbing against the osteoligamentous ceiling.   However, some people do not experience inflammation.   This could affect the infraspinatus tendon and the long head of the bicep.   Calcification may occur, causing irreversible degrading of the supraspinatus tendon.  

Source: Delavier, F. (2006). Strength Training Anatomy (2nd ed.). Paris, France: Human Kinetics.

Picture Source: Hatfield, Ph.d, F. C. (2004). Strength. Fitness: The Complete Guide (p. 245). Santa Barbara, California: International Sports Sciences Association

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