Objective To compare the clinical efficacy of arthroscopic subscapular tendon repair combined with coracoplasty formation versus simple subscapular tendon repair for the treatment of subscapular tendon injuries caused by subcoracoid im-pingement syndrome.Methods A retrospective analysis was conducted on 30 cases of subscapularis tendon injury due to sub-coracoid impingement treated with arthroscopic surgery from January 2020 to January 2023.Among these,15 cases(group A)underwent subscapularis tendon repair combined with coracoplasty,while the remaining 15 cases(group B)only received sub-scapularis tendon repair without any treatment on the coracoid.Two groups were compared at 6 months after operation in terms of pain VAS scores,active external rotation range of motion of the affected shoulder,coracohumeral distance,shoulder function UCLA score,and shoulder function ASES score.Results All 30 cases were followed up for 6 to 12 months,with an average of 8.7 months.Postoperative incisions all healed in one stage,without complications such as systemic or local shoulder joint infec-tions and brachial plexus nerve damage.No re-tearing of the subscapular tendon occurred in group A during the follow-up peri-od,while one case in group B experienced re-tearing of the subscapular tendon at 10 months postoperatively.At 6 months post-operatively,the pain VAS scores,active external rotation range of motion of the affected shoulder,coracoid-humeral distance,shoulder joint function UCLA scores,and shoulder joint function ASES scores in group A were better than those in group B,with statistically significant differences(P<0.05).Conclusion Subcoracoid impingement syndrome is a significant cause of sub-scapular tendon injury.The outcome of treating such patients with arthroscopic subscapular tendon repair combined with coraco-plasty is superior to that of simple subscapular tendon repair.