• Foot Ankle Int · Jul 2001

    Comparative Study

    Intramedullary screw fixation of proximal fifth metatarsal fractures: a biomechanical study.

    • S N Shah, G O Knoblich, D P Lindsey, J Kreshak, S A Yerby, and L B Chou.
    • Department of Functional Restoration, Stanford University School of Medicine, CA 94305, USA.
    • Foot Ankle Int. 2001 Jul 1; 22 (7): 581-4.

    AbstractIntramedullary screw fixation is a popular technique for treatment of proximal fifth metatarsal fractures. The purpose of this study was to compare the fixation rigidity of a 5.5 mm partially threaded cannulated titanium screw, with presumed superior endosteal purchase, to a similar 4.5 mm screw. Acute fifth metatarsal fractures were simulated in cadavers, stabilized with intramedullary screws, and loaded to failure in three-point bending. The initial failure loads for the metatarsals fixed with 4.5 mm and 5.5 mm screws were not significantly different (332.4 N vs. 335.2 N, respectively), nor were the ultimate failure loads (849.8 N vs. 702.2 N, respectively). Based upon our results, maximizing screw diameter does not appear to be critical for fixation rigidity and may increase the risk of intraoperative or postoperative fracture.

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