ZILRETTA in Subjects With Shoulder Osteoarthritis

Primary Objective: To assess the efficacy of ZILRETTA on pain following an intra-articular (IA) injection in subjects with glenohumeral osteoarthritis (OA) relative to normal saline placebo Secondary Objective: * To assess the efficacy of ZILRETTA on pain following an IA injection in subjects with glenohumeral OA relative to triamcinolone acetonide injectable suspension, and normal saline placebo * To assess the safety of ZILRETTA in subjects with glenohumeral OA relative to normal saline placebo