Objective: To investigate the medium-term clinical effects of fascia lata autograft bridging in the treatment of massive irreparable rotator cuff tear, and to compare the clinical effects of the two surgical modalities in the open group and the arthroscopic group. Subjects and methods: A retrospective analysis was performed for the clinical data of 12 patients who underwent fascia lata autograft bridging surgery for massive irreparable rotator cuff tears from January 2017 to December 2019, with 6 patients in the open group and 6 patients in the arthroscopic group, which show no significant difference in the preoperative general data of the two groups (P>0.05). The function of the shoulder joint before and after surgery between two groups was compared using the VAS score, Constant-Murley score, and ASES score, and imaging was uesd to assess postoperative subacromial space changes and the integrity of fascia lata after patch bridging. Results: All 12 patients had follow-up for at least 3 years, with an average follow-up of 43.1±6.4) months. All patients had significant improvement in shoulder function scores compared with preoperative (P< 0.001). MRI shows that fascia lata patch healed well with the supraspinatus tendon stump and the greater tubercles of humerus. No significant differences were found in the preoperative and postoperative scores of the shoulder joints between the two groups. Conclusion: In the treatment of massive irreparable rotator cuff tear,the patients using Fascia lata patch bridging had a good medium-term effects, and there is no significant difference in the medium-term effects between the open group and the arthroscopic group.