64 patients with primary frozen shoulder (adhesive capsulitis) were randomized to receive either a multisite (rotator interval, intraarticular, and subacromial bursa) triamcinolone injection (MCI; n=32) or a single-site triamcinolone injection (SRI; n=32). The primary outcomes of interest include range of motion in shoulder flexion, abduction, external and internal rotation and pain on a Visual Analog Scale (VAS). Secondary outcomes included patient satisfaction, American Shoudler and Elbow Surgeons (ASES) scores, Contant-Murley Score (CMS), and the incidence of palpitations. Range of motion in flexion, abduction, internal rotation at 8 weeks, ASES scores, CMS scores, and VAS pain at 4 & 8 weeks were all significantly better in the MCI group compared to the SRI group. All other outcomes were similar between the two groups.