Comparison of pull-out resistance of Kirschner wires and Imex™ miniature interface fixation half pins in polyurethane foam

K. M. Sandman; C. W. Smith; J. Harari; S. Manfra Marretta; G. J. Pijanowski; D. J. Schaeffer

doi:10.1055/s-0038-1632708

Veterinary and Comparative Orthopaedics and Traumatology, Table of Contents

Vet Comp Orthop Traumatol 2002; 15(01): 18-22
DOI: 10.1055/s-0038-1632708

Original Research

Schattauer GmbH

Comparison of pull-out resistance of Kirschner wires and Imex™ miniature interface fixation half pins in polyurethane foam

Authors

K. M. Sandman

¹Mobile Animal Surgical Service, Lincolnshire, IL, USA
C. W. Smith

²Small Animal Surgery, Department of Veterinary Clinical Medicine College of Veterinary Medicine University of Illinois, USA
J. Harari

³Veterinary Referral Services, Spokane, WA, USA
S. Manfra Marretta

²Small Animal Surgery, Department of Veterinary Clinical Medicine College of Veterinary Medicine University of Illinois, USA
G. J. Pijanowski

⁴Department of Veterinary Biosciences, College of Veterinary Medicine University of Illinois, USA
D. J. Schaeffer

⁵Toxicology and Biostatistics, Department of Veterinary Biosciences, College of Veterinary Medicine University of Illinois, USA

Abstract

Summary

The pin-bone interface is critical in maintaining a stable external skeletal fixator to allow bony union and prevent complications related to loose pins (3, 7, 13, 14, 16, 17). Threaded pins have increased pull-out strength in comparison to smooth pins and have improved the bone-pin interface (1, 2, 4, 12, 16, 21). Pull-out strengths were compared between smooth Kirschner size pins and Imex™ Miniature Interface Fixation Half Pins in a polyurethane foam bone model. The negative profile end threaded pins had significantly higher pull-out strengths (p <0.001) than smooth pins. Increasing the diameter of the pin and the length of engagement also increased the pull-out strengths of both pin types. Improving the pull-out strength of pins should minimize morbidity of external skeletal fixators used in repair of mandibular/maxillary fractures or long bone repairs on small and exotic patients.

Keywords

External Skeletal Fixator - Negative Profile Pins - Kirschner Wires - Polyurethane Foarri

Full Text

References

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