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Purpose:The optimal surgical treatment of displaced type B and C fractures of the proximal humerus in the elderly remains controversial.Good clinical results have been reported by plating these fractures as well as a high rate of complications.Our retrospective study aims to evaluate clinical recovery and complications using the S3 locking plate in elderly patients.Methods:Fifty-one patients older than 65 years of age,with a complex proximal humeral fracture type B or C (AO classification system),were included.Patients have been followed up for a minimum of 12 months.We assessed callus formation,radiological results,clinical outcome (according to the Constant Shoulder Score System) and complications.Any difference in the clinical recovery among the 2 types of fracture patt (B and C) was investigated.Results:The mean time of fracture healing was 12.4 weeks.The mean Constant score at 3,6 and 12 months was 68,73 and 75 respectively.No statistically significant difference in the clinical outcome was observed between the B and C fracture patts (p ＞ 0.05).We noticed an overall of 5 complications (9.8％).There was no need to revision any of the implants.Conclusion:Anatomic reduction and proper plate positioning are essential for minimizing implantrelated complications.In our experience the S3 angular stability system offers a proper osteosyntesis and a good clinical recovery with a low rate of complications.