For Phase I of the study, up to 20 patients treated for shoulder pain will be recruited from Advanced Physical Therapy. For Phase II of the study, up to 100 patients with shoulder pain scheduled to have a shoulder injection will be asked by an investigator if they wish to participate in the study until a number of 30 subjects qualify for the study. Phase II of the study will include shoulder tests before and about 20 minutes after the injection and a 4- to 7-day, as well as a 6-week, phone follow-up.