X-Ray vision: Reviving a 'dead arm'

X-Ray vision: Reviving a 'dead arm': "The rotator cuff is a group of four muscles but the part most commonly injured is the supraspinatus tendon. The labrum is a cartilaginous structure that surrounds the shoulder socket (or glenoid). It functions like the bumper around a pool table to prevent the shoulder from dislocating.

The throwing motion creates angular velocities of up to 7200°/second. Both the labrum and rotator cuff work extremely hard during this motion to stabilize the arm and dissipate the forces generated. An injury to either structure can make it difficult to throw.

These injuries result from myriad causes including compensatory anatomic anomalies that develop in the shoulders of throwers to the repetitive microtrauma caused by years of throwing baseballs. The end results are injuries that can range from minor strains or tendonitis to complete tears."


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