Shaoxing

Researchers are evaluating the effectiveness of two injection methods for treating frozen shoulder adhesive capsulitis in adults aged 18 to 65. The study aims to find out whether a gluteal muscle injection of compound betamethasone works as well as an ultrasound-guided injection directly into the shoulder joint for improving shoulder function and reducing pain, while also monitoring side effects of each approach. Participants are randomly assigned to receive either a single gluteal intramuscular injection of compound betamethasone combined with a placebo injection into the shoulder joint, or a single ultrasound-guided intra-articular injection of compound betamethasone with a placebo gluteal injection. All participants follow a standardized home-based shoulder rehabilitation exercise program twice daily for 12 weeks. During the 12-week study, participants will have their shoulder function and pain assessed using tools like the Shoulder Pain and Disability Index SPADI, QuickDASH, EQ-5D-5L, and pain numeric rating scales. Researchers will measure changes in shoulder motion, pain levels, and quality of life at multiple time points up to 12 weeks. Safety and side effects will also be monitored throughout the study period.