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Vet Comp Orthop Traumatol 1998; 11(03): 146-151
DOI: 10.1055/s-0038-1632537
Original Research
Schattauer GmbH

Holding Power of 3.5 mm Versus 4.0 mm Screw Applications Placed in Stripped 2.7 mm Screw Sites

R. B. Fitch
1   From the Department of Veterinary Clinical Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
,
S. C. Kerwin
1   From the Department of Veterinary Clinical Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
,
S. A. Sedrish
1   From the Department of Veterinary Clinical Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
,
G. Hosgood
1   From the Department of Veterinary Clinical Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
,
J. L. Oliver
2   Veterinary Pathology, Louisiana State University, Baton Rouge, Louisiana, USA
,
K. Kelly
3   Mechanical Engineering, Louisiana State University, Baton Rouge, Louisiana, USA
› Author Affiliations
Further Information

Publication History

Received:24 July 1997

Accepted:20 December 1997

Publication Date:
10 February 2018 (online)

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Summary

Mechanical stripping of orthopaedic screws is a complication that can occur during plate fixation of fractures. This report compares the holding power of 3.5 mm cortical and 4.0 mm cancellous orthopaedic screws inserted as a salvage technique in stripped 2.7 mm screw sites in cadaver bone. Both 3.5 mm and 4.0 mm orthopaedic screws were applied with and without tapping to stripped screw sites in the diaphysis of mature canine tibiae. Mechanical testing of the pull-out force required to extract these screws showed that all of the applications have comparative holding powers, but the 4.0 mm screw had significantly greater holding power when compared with the 3.5 mm screw. Tapping the stripped screw site, prior to placing the 3.5 mm or 4.0 mm screw, did not significantly affect the holding power. The 4.0 mm cancellous screw has the advantages of significantly greater holding power and less interference with the 2.7 mm dynamic compression plate, when compared to the 3.5 mm cortical screw.

The holding power of 3.5 mm cortical and 4.0 mm cancellous orthopaedic screws placed tapped and untapped into 2.7 mm stripped screw sites in post-mortem canine tibiae were compared. All applications had comparable holding power, but with the 4.0 mm screw the holding power was significantly greater. Tapping stripped screw sites did not have any significant effect on holding power.

Keywords

Canine - screws - holding power - screw stripping - fracture repair
 

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