Clinical and radiographic outcomes of reverse shoulder arthroplasty using a hybrid baseplate fixation mechanism

Abstract Background Despite the success of RSA, complication rates remain high (13% to 25%), due to instability, infection, and glenoid component loosening, which can lead to revision. The aim of the present study was to report the early clinical outcomes of RSA using a new hybrid baseplate design, in comparison with the literature on other common RSA baseplates. Methods The authors retrospectively analyzed the records of 142 patients (142 shoulders) who underwent primary RSA using a hybrid baseplate design by the senior surgeons between May 2014 and December 2018. Pre- and postoperative assessment included the Constant score (CS) and range of motion (ROM); including active forward elevation (AFE), external rotation (ER), and internal rotation (IR). Results Of the initial cohort of 142 patients, 13 were lost to follow-up (8.6%), 2 died (1.3%), and 8 required reoperations with implant removal (5.3%). The remaining 119 patients comprised 71 women (60%), and 48 men (40%), aged 73.6±7.3 years at index surgery, 43 of which required bony increased offset (BIO) (36%). At a minimum follow-up of 2 years, the CS improved by 37.3±16.1, AFE increased by 51.2°±38.1°, ER increased by 16.4°±25.0°, and IR increased by 1.5±3.2. Conclusion At a minimum follow-up of 2 years following RSA using a new hybrid baseplate system, the CS and ROM were satisfactory, and comparable to those in recent systematic reviews. The findings of this study suggest that this hybrid baseplate system provides satisfactory outcomes in the short-term, though longer follow-up studies are needed to validate its long-term efficacy.