Impact of Screw Length on Fixed Proximal Scaphoid Fracture Biomechanics: In Vitro Study with Cyclic Loading and Load to Failure
نویسنده
چکیده
Introduction: Internal fixation used as treatment for scaphoid fractures has increased with advances in surgical techniques [1]. Proximal pole scaphoid fractures present a clinical challenge due to their lower success rate when cast immobilization and internal fixation are utilized [2]. Screws maximizing length have been shown to impact wrist motion for fixed scaphoid waist fractures [3]. Additionally, screws with greater diameters and varying geometry have been shown to impact stiffness and ultimate load at the fracture site for fixed scaphoid waist fractures. Currently, the effect of screw length on the structural properties of fixed proximal scaphoid fractures is not well understood even though fixation of proximal scaphoid fractures has a high nonunion rate. Therefore, the objective of this study is to determine the bending stiffness and ultimate load for the loading of fixed proximal scaphoid fractures for screws of various lengths. We hypothesize that longer screws will provide greater biomechanical stability due to there being greater purchase or bone-screw interaction beyond the fracture site.
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