A water polo player complains of pain in her right shoulder….
A water polo player complains of pain in her right shoulder. The patient has difficulty isolating the exact location of the pain, however indicates the pain begins 10-15 minutes after the onset of activity and lasts for approximately two hours after the activity is completed. Physical examination reveals subjective reports of pain at 90 degrees of passive and active abduction. Internal and external range of motion is within normal limits with the humerus at the patient’s side. Resistive isometrics are strong and painful for flexion and abduction. The most likely diagnosis is: