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- W3048181323 abstract "Arthroscopic coracoid bone-block fixation by Endobutton was developed to avoid the complications associated with screwing. However, few studies have assessed the mechanical characteristics of the two. The aim of the present study was to assess and compare fixation rigidity by screw versus Endobutton. The study hypothesis was that rigidity is lower with Endobutton than with screws. 3D print-outs of a glenoid and a coracoid process were obtained from CT scans of a patient showing anterior shoulder instability with significant bone defect. Four types of coracoid fixation were implemented: 1 or 2 4.5 mm malleolar screws, and 1 or 2 Endobuttons. Three specimens per assembly were placed on a specific test bench. Lateromedial bone-block compression was exerted at 0.1 mm/sec at 3 points: superior, central, inferior. The resultant force and bone-block displacement were recorded. Mean fixation rigidity with 1 screw, 2 screws, 1 Endobutton and 2 Endobuttons was respectively 158 N/mm (range, 133–179), 249 N/mm (241–259), 10 N/mm (5–13) and 14 N/mm (13–15), with significant difference between the screw and Endobutton groups (p < 0.001). Displacement was greater with 1 than 2 Endobuttons under superior or inferior force, while the difference was non-significant under central force (7.45 vs 6.93 mm; p = 0.53) Screw fixation showed greater rigidity, while the Endobutton assembly showed less tension, leading to greater bone-block mobilization. The interest of using two Endobuttons is to reduce displacement under polar pressure. the present biomechanical study confirmed the mechanical vulnerability of bone-blocks fixed by endobutton until consolidation is achieved. Biomechanical study." @default.
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- W3048181323 date "2020-10-01" @default.
- W3048181323 modified "2023-10-16" @default.
- W3048181323 title "Mechanical behavior of screw versus Endobutton for coracoid bone-block fixation" @default.
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- W3048181323 doi "https://doi.org/10.1016/j.otsr.2020.03.035" @default.
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