Mechanical evaluation of a tapered thread-run-out half-pin designed for external skeletal fixation in small animals

H. Griffin; J. P. Toombs; D. G. Bronson; J. D. Ross; R. H. Browne

doi:10.3415/VCOT-10-04-0054

Veterinary and Comparative Orthopaedics and Traumatology, Table of Contents

Vet Comp Orthop Traumatol 2011; 24(04): 257-261
DOI: 10.3415/VCOT-10-04-0054

Original Research

Schattauer GmbH

Mechanical evaluation of a tapered thread-run-out half-pin designed for external skeletal fixation in small animals

H. Griffin

¹IMEX Veterinary, Inc. Longview, Texas, USA

,

J. P. Toombs

²Iowa State University, College of Veterinary Medicine, Department of Veterinary Clinical Sciences, Ames, Iowa, USA

,

D. G. Bronson

³Seay Center for Musculoskeletal Research, Texas Scottish Rite Hospital for Children, Dallas, Texas, USA

,

J. D. Ross

³Seay Center for Musculoskeletal Research, Texas Scottish Rite Hospital for Children, Dallas, Texas, USA

,

R. H. Browne

³Seay Center for Musculoskeletal Research, Texas Scottish Rite Hospital for Children, Dallas, Texas, USA

› Author Affiliations

Abstract

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Summary

An in vitro mechanical study was performed to compare the stiffness, maximum load, and cyclic load-to-failure of a new external fixation half-pin design utilizing a tapered thread-run-out (TRO) feature with currently available positive profile thread (PP) half-pins. Five different sizes of each of the two pin types were evaluated. Under static loading, TRO pins were significantly stiffer and had a higher maximum load compared to the similar sized PP pins (p ±0.0001 for all comparisons). In cyclic fatigue testing, TRO pins lasted 2.3- to 4.9-fold more cycles than PP pins of similar size (p ±0.0001 for all comparisons). The increased pin stiffness and improved cyclic lifespan provided by TRO pins may be especially valuable in the stabilization of biologically and mechanically challenging fracture cases where healing is prolonged.

Keywords

External skeletal fixation - half-pins - tapered thread-run-out - mechanical evaluation

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References

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