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

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. Ac...

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Bibliographic Details
Published inFoot & ankle international Vol. 22; no. 7; p. 581
Main Authors Shah, S N, Knoblich, G O, Lindsey, D P, Kreshak, J, Yerby, S A, Chou, L B
Format Journal Article
LanguageEnglish
Published United States 01.07.2001
Subjects
Biomechanical Phenomena
Bone Screws
Cadaver
Fracture Fixation, Intramedullary - instrumentation
Fracture Fixation, Intramedullary - methods
Fractures, Bone - surgery
Humans
Metatarsal Bones - injuries
Metatarsal Bones - surgery
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Summary: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.
ISSN:1071-1007
DOI:10.1177/107110070102200709