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Am J Vet Res. 1998 Feb;59(2):201-4.

Effect of pin hole size and number on in vitro bone strength in the equine radius loaded in torsion.

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  • 1Department of Veterinary Clinical Sciences, Washington State University, Pullman 99164, USA.

Abstract

OBJECTIVE:

To determine the effect of pin hole size and number on the breaking strength of the adult equine radius when loaded in torsion to failure.

SAMPLE POPULATION:

54 pairs of equine radii from adult horses.

PROCEDURE:

For test one, 12 pairs of radii were used to determine the effect of pin hole size on torsional breaking strength. A 6.35-mm hole was drilled in 1 radius, and a 9.5-mm hole was drilled in the contralateral radius. For test two, 36 pairs of radii were randomly assigned to 1 of 3 treatment groups (n = 12) to determine the effect of pin hole number on the torsional breaking strength of the equine radius. One radius of each pair served as a control, and one, three, or six 6.35-mm transcortical holes were drilled in the contralateral radius. For test three, 6 pairs of radii had torsional forces applied directly to the transfixation pins, as opposed to the bone itself. One radius of a pair served as a control, and three 6.35-mm smooth Steinman pins were placed in the contralateral radius. All radii were loaded in torsion to failure, and the breaking strengths were recorded.

RESULTS:

Compared with the 6.35-mm hole, the 9.5-mm hole significantly decreased torsional strength of the radius. There was no significant difference in mean torsional strength between the control radii and the radii with 1, 3, or 6 transcortical holes or when the transfixation pins were loaded.

CONCLUSION:

Use of up to three 6.35-mm transfixation pins can be used in a full-limb transfixation pin cast to optimize stiffness without a significant decrease (12%) in bone strength.

PMID:
9492937
[PubMed - indexed for MEDLINE]
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