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- W233835008 abstract "Abstract Background The objective of this study was to evaluate the biomechanical effect of an additional unlocked calcar screw compared to a standard setting with three proximal humeral head screws alone for fixation of an unstable 2-part fracture of the surgical neck. Hypothesis The additional calcar screw improves stiffness and failure load. Methods Fourteen fresh-frozen humeri were randomized into two equal sized groups. An unstable 2-part fracture of the surgical neck was simulated and all specimens were fixed with the MultiLoc ® -nail. Group I represented a basic screw setup, with three locked head screws and two unlocked shaft screws. Group II was identical with a supplemental unlocked calcar screw (CS). Stiffness tests were performed in torsional loading, as well as in axial and in 20° abduction/20° adduction modes. Subsequently cyclic loading and load to failure tests were performed. Resulting stiffness, displacement under cyclic load and ultimate load were compared between groups using the t-test for independent variables (α = 0.05). Results No significant differences was observed between the groups in any of the biomechanical parameters. Backing out of the CS was observed in three cases. Discussion The use of an additional unlocked calcar screw does not provide mechanical benefit in locked nailing of an unstable 2-part fracture of the surgical neck. Level of evidence Level III. Experimental biomechanical study with human specimen." @default.
- W233835008 created "2016-06-24" @default.
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- W233835008 date "2015-06-01" @default.
- W233835008 modified "2023-09-26" @default.
- W233835008 title "Est-il avantageux d’ajouter une vis supplémentaire au travers du calcar dans l’enclouage verrouillé de l’humérus proximal ?" @default.
- W233835008 doi "https://doi.org/10.1016/j.rcot.2015.01.025" @default.
- W233835008 hasPublicationYear "2015" @default.
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