Pull-out strength of orthopaedic screws in polymethylmethacrylate filled medullary cavities of foal third metacarpal bones

G. A. Sod; G. S. Martin; M. S. Gill

doi:10.1055/s-0038-1632801

Veterinary and Comparative Orthopaedics and Traumatology, Inhaltsverzeichnis

Vet Comp Orthop Traumatol 2004; 17(03): 136-140
DOI: 10.1055/s-0038-1632801

Original Research

Schattauer GmbH

Pull-out strength of orthopaedic screws in polymethylmethacrylate filled medullary cavities of foal third metacarpal bones

G. A. Sod

¹Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, USA

,

G. S. Martin

²Sawtooth Equine Service, Bellevue, ID, USA

,

M. S. Gill

¹Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, USA

› Institutsangaben

Abstract

Summary

The purpose of this study was to determine the in vitro pull-out force and strength of 4.5-mm and 5.5-mm cortical screws inserted in the diaphysis of foal third metacarpal bones with and without polymethylmethacrylate (PMMA) filling the medullary cavity. Filling the medullary cavity with PMMA significantly increased the pull-out force of 4.5-mm screws by 2.0-fold, and 5.5-mm screws by 2.2-fold, compared to controls (p < 0.001). Also the mean pull-out strength per mm of bones filled with PMMA was significantly greater (p < 0.001) than empty control bones. Our results suggest that filling the medullary cavity with PMMA at sites of greater stress, such as the ends of the plate and near the fracture site, may result in a more stable internal fixation.

Keywords

Pull-out strength - cortical screws - polymethylmethacrylate - foal - third metacarpal

Volltext

Referenzen

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