Background Acromioclavicular (AC) joint injuries account for approximately 12% of shoulder injuries. The management of these injuries varies depending on the severity of ligament disruption. This study evaluates the post-operative range of motion and functional outcomes of AC joint disruption treated with a fixed loop endobutton. Methods This retrospective study was conducted at Mandya Institute of Medical Sciences, Mandya over a period of 24 months (November 2022 – October 2024). The study included patients aged 18–60 years who underwent open reduction and internal fixation using a fixed loop endobutton. Functional outcomes were assessed using the UCLA shoulder rating scale, Constant-Murley Score (CMS), American Shoulder and Elbow Surgeons (ASES) rating, Oxford Shoulder Score (OSS), and coracoclavicular interval (CC-interval). Patients treated conservatively were also evaluated for comparison. Results A total of 38 patients were included; 24 underwent fixed loop endobutton surgery, and 14 received conservative treatment. The mean age was 36.2 ± 9.22 years for the surgical group and 46.84 ± 10.45 years for the conservative group (p = 0.004). No significant differences were noted in baseline characteristics. The surgical group showed superior results in shoulder mobility, grip strength, and rehabilitation time. Complications included one case of infection and one case of endobutton failure in the surgical group, whereas shoulder impingement and stiffness were more frequent in the conservative group.

Acromioclavicular Joint, Fixed Loop Endobutton, Shoulder Injury, Orthopedic Surgery, Functional Outcomes.