• Anselme Billaud, Eduardo Cruz-Ferreira, Lionel Pesquer, Pierre Abadie, Yacine Carlier, and Pierre-Henri Flurin.
• Clinique du Sport-CCOS, 2 Rue Georges Negrevergne, 33700, Mérignac, France. anselme75@gmail.com.
• Arch Orthop Trauma Surg. 2019 Aug 1; 139 (8): 1125-1132.

IntroductionNo clinical studies to date have analyzed the critical shoulder angle (CSA) following anterior acromioplasty. Our study's main objective was to measure the change in the CSA after acromioplasty.Materials And MethodsNinety patients were included in this retrospective series. The CSA and the type of acromion were evaluated before and after surgery.ResultsThe average CSA for patients before surgery was 35.9° (± 3.7, 26.2, 44.2) and 33° after the acromioplasty (± 3.5, 24.8, 41.4). The decrease was significant and 2.9° on average (± 2.2, - 2.2, 11.9, p = 0.000). Preoperatively, 58% of patients had a CSA ≥ 35° (n = 52) and 24% postoperatively (n = 22, p = 0.000).ConclusionsStandardized anterior acromioplasty allows for a significant decrease in the CSA without lateral resection of the acromion. This study confirms the tight link between the CSA and the anterior acromion as well as the interest of this angle to quantify acromioplasty whether anterior or lateral.Level Of EvidenceLevel IV, Case Series, Retrospective design.

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