Objective:To compare the effects of manual release assisted arthroscopic surgery in patients with rotator cuff tears and frozen shoulder at different injury times.Methods:A retrospective analysis was conducted on 86 patients with rotator cuff tears and frozen shoulder,patients were divided into two groups based on the time since injury:group A(rotator cuff tear＜3 months,n=44)and group B(3 months ≤ rotator cuff tear ≤6 months,n=42).Both groups underwent MUA-assisted arthroscopic surgery.Surgical in-dicators(operation time and intraoperative blood loss),pain levels before and after treatment,range of motion of the shoulder joint(in-cluding forward flexion and external rotation),University of California Los Angeles(UCLA)Shoulder Score,American Shoulder and El-bow Surgeons(ASES)score,and complications were compared between the two groups.Results:There were no significant differences in surgical indicators between group A and group B(P＞0.05).At 1 and 3 month postoperatively,both groups showed reduced Visual Analog Scale(VAS)pain scores(P＜0.05),increased range of shoulder motion(P＜0.05),and improved UCLA and ASES scores(P＜0.05).Furthermore,at 1 month postoperatively,group A had lower VAS pain scores(P＜0.05),greater range of shoulder motion(P＜0.05),and higher UCLA and ASES scores(P＜0.05)compared to group B.At 3 months postoperatively,there were no signifi-cant differences in VAS pain scores,range of shoulder motion,and UCLA and ASES scores between group A and group B(P＞0.05).No nerve injuries,infections,or complications related to MUA were observed in either group postoperatively.Conclusion:Compared to patients with rotator cuff tears and frozen shoulder who have the injury for 3 to 6 months,those with an injury duration of less than 3 months showed more significant early symptom relief and better shoulder mobility when treated with MUA-assisted arthroscopic surgery,although long-term outcomes tend to be consistent.