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Causes of shoulder injuries: - Blunt trauma to the joint. - Lifting. - Falling onto the shoulder. - Repetitive overhead work. Shoulder injuries can be caused by repetitive motions, heavy lifting or throwing, or even everyday motions that are not particularly strenuous. People who do strenuous or repetitive overhead work are at more risk of. Trauma in one of the leading causes of the impingement. Through studies, in recent years it has become apparent that "anterior sub-acromial impingement" is a leading cause of shoulder pain and disability. The acromion offers protection, stability, and mechanical advantage to the glenohumeral joint because it lies directly above the humeral head. Summary. A torn shoulder labrum often occurs as a result of overuse or from a blunt force trauma to the shoulder. When a labrum tear occurs, a person will experience shoulder pain, a reduced range. If you have sustained a shoulder injury in any kind of serious accident in Oregon and don't know what comes next, feel free to call the experienced personal injury attorneys at Dwyer Williams. The labrum is a cup-shaped rim of cartilage that lines and reinforces the ball-and-socket joint of the shoulder. The shoulder joint is composed of the glenoid (the shallow shoulder "socket") and the head of the upper arm bone known as the humerus (the "ball"). The labrum is the attachment site for the shoulder ligaments and supports the ball. Because shoulder injuries can range from minor to debilitating, claim values can provide victims anywhere from $10,000 to $200,000, depending on factors such as the severity of the injury.