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Intramedullary screw fixation of proximal fifth metatarsal fractures: A biomechanical study FOOT & ANKLE INTERNATIONAL Shah, S. N., Knoblich, G. O., Lindsey, D. P., Kreshak, J., Yerby, S. A., Chou, L. B. 2001; 22 (7): 581-584

Abstract

Intramedullary 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.

View details for Web of Science ID 000170686700009

View details for PubMedID 11503984