A 35-year-old, right-handed male presented to the emergency department with complaint of right upper arm pain. He was a member of an amateur baseball team; just prior to arrival he threw a ball and immediately felt a pop and sharp pain in his right upper arm. Since that time, he had been unable to move his arm due to pain. He reported no prior injury to the arm but did state that over the last several weeks he had been having an ache in that arm. He was otherwise healthy, took no medications, denied weakness, numbness and tingling in his right arm. He was a non-smoker and an occasional drinker. He used no drugs…

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