Impingement (impact on bone into rotator cuff tendon or bursa) should not occur during normal shoulder function. The bursa is the sac of fluid which essentially lubricates your shoulder. When it does happen, the rotator cuff tendon becomes inflamed and swollen, a condition called rotator cuff tendonitis. Likewise if the bursa becomes inflamed, shoulder bursitis will develop. It is repeated movement of your arm into the impingement zone overhead that most frequently causes the rotator cuff to contact the outer end of the shoulder blade. When this repeatedly occurs, the swollen rotator cuff is trapped and pinched.
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