PMID: 9525030Apr 3, 1998Paper

In vitro pullout strength of screws inserted in adult equine third metacarpal bone after overdrilling a 4.5-mm threaded insertion hole

Veterinary Surgery : VS
S A SedrishD J Burba

Abstract

To determine and compare the in vitro pullout strength of 5.5-mm cortical versus 6.5-mm cancellous bone screws inserted in the diaphysis and metaphysis of adult equine third metacarpal (MCIII) bones, in threaded 4.5-mm cortical bone screw insertion holes that were then overdrilled with a 4.5-mm drill bit to provide information relevant to the selection of a replacement screw if a 4.5-mm cortical screw is stripped. In vitro pullout tests of 5.5-mm cortical and 6.5-mm cancellous screws in equine MCIII bones. Two independent cadaver studies each consisting of 14 adult equine MCIII bones. Two 4.5-mm cortical screws were placed either in the middiaphysis (study 1) or distal metaphysis (study 2) of MCIII bones. The holes were then overdrilled with a 4.5-mm drill bit and had either a 5.5-mm cortical or a 6.5-mm cancellous screw inserted; screw pullout tests were performed at a rate of 0.04 mm/second until screw or bone failure occurred. In diaphyseal bone, the screws failed in all tests. Tensile breaking strength for 5.5-mm cortical screws (997.5 +/- 49.3 kg) and 6.5-mm cancellous screws (931.6 +/- 19.5 kg) was not significantly different. In metaphyseal bone, the bone failed in all tests. The holding power for 6.5-mm cancellous screw...Continue Reading

References

Sep 1, 1992·Veterinary Surgery : VS·J P GillisK R St John
Jan 1, 1990·Journal of Orthopaedic Trauma·T A DeCosterW Jones
Jun 1, 1995·Plastic and Reconstructive Surgery·A Gantous, J H Phillips

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Citations

Oct 14, 2004·The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons·Michael C McGlamry, Melissa F Robitaille
Jul 11, 2006·Journal of Orthopaedic Trauma·Cory CollingeEugene P Lautenschlager

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