Vet Comp Orthop Traumatol 2018; 31(06): 438-444
DOI: 10.1055/s-0038-1668084
Original Research
Georg Thieme Verlag KG Stuttgart · New York

Biomechanical Properties of the 1.5 mm Locking Compression Plate: Comparison with the 1.5 and 2.0 mm Straight Plates in Compression and Torsion

Gwyneth K. Watrous
1  Department of Clinical Studies, University of Guelph, Ontario Veterinary College, Guelph, Ontario, Canada
,
Noel M. M. Moens
1  Department of Clinical Studies, University of Guelph, Ontario Veterinary College, Guelph, Ontario, Canada
,
John Runciman
2  Department of Engineering, University of Guelph, Guelph, Ontario, Canada
,
Tom W. G. Gibson
1  Department of Clinical Studies, University of Guelph, Ontario Veterinary College, Guelph, Ontario, Canada
› Author Affiliations
Further Information

Publication History

15 May 2017

31 May 2018

Publication Date:
24 October 2018 (eFirst)

Abstract

Objectives The purpose was to compare the biomechanical properties of a 1.5 mm locking compression plate (1.5 LCP) to the 1.5 mm straight plate (1.5 P), 1.5 mm straight plate stacked (1.5 PSt) and 2.0 mm straight plate (2.0 P) in compression and torsion. We hypothesized that biomechanical properties of the 1.5 LCP would be equivalent to properties of the 1.5 P and would represent an alternative for the treatment of radial fractures in miniature breed dogs in which those plates would be used.

Materials and Methods A 1 mm fracture gap model was created with a bone surrogate stabilized with a six-hole plate. Sixteen constructs were built for each of the four plate configurations. Eight constructs from each group were tested in compression to failure and eight constructs were tested in torsion to failure.

Results In compression testing, the 1.5 LCP was stiffer than the 1.5 P, and had similar stiffness than the 1.5 PSt and the 2.0 P. The load at yield of the 1.5 LCP was slightly lower than the 1.5 P. In torsion, the 1.5 LCP and 1.5 P had similar stiffness, but 1.5 LCP was slightly stronger than 1.5 P. The 1.5 PSt and 2.0 P were overall superior to the 1.5 LCP but only marginally so for the 1.5 PSt.

Clinical Relevance The 1.5 LCP can be considered biomechanically equivalent to the 1.5 P under the present experimental conditions. The use of the 1.5 LCP can be considered as an option for radial fracture repair in dogs in which a 1.5 P would have otherwise been used. The use of a locking plate to improve overall success rate, in these fractures, remains to be confirmed clinically.

Author Contributions

Noel M. M. Moens and John Runciman contributed to conception of study, study design, acquisition of data and data analysis and interpretation. Gwyneth K. Watrous contributed to acquisition of data and data analysis and interpretation. Tom W. G. Gibson contributed to conception of study, study design and data analysis and interpretation. All authors drafted, revised and approved the submitted manuscript.