Funded in part by the AO North America Resident Trauma Research Grant 2007, CVM Small Companion Animal Grant 2007, and Synthes Resident Research Funding.
Biomechanical Analysis of Stacked Plating Techniques to Stabilize Distal Radial Fractures in Small Dogs
Article first published online: 8 DEC 2009
© Copyright 2009 by The American College of Veterinary Surgeons
Volume 38, Issue 8, pages 954–960, December 2009
How to Cite
ROSE, B. W., PLUHAR, G. E., NOVO, R. E. and LUNOS, S. (2009), Biomechanical Analysis of Stacked Plating Techniques to Stabilize Distal Radial Fractures in Small Dogs. Veterinary Surgery, 38: 954–960. doi: 10.1111/j.1532-950X.2009.00587.x
- Issue published online: 8 DEC 2009
- Article first published online: 8 DEC 2009
- Submitted March 2009; Accepted June 2009
Objective— To evaluate the fatigue life of partially stacked and fully stacked (1.5/2.0 and 2.0/2.7 mm) veterinary cuttable plates (VCP) in a fracture gap model of the distal aspect of the radius.
Study Design— In vitro biomechanical study.
Methods— Constructs (n=4/group) were assembled for each of 8 groups using 8-hole plates (1.5/2.0 and 2.0/2.7 mm VCP) in the following configurations: unstacked; 2-hole stacked centered over the gap (COG); 4-hole stacked COG; and fully stacked. Plate(s) were secured to 2 separate polyvinylchloride pipe lengths, mounted to a mechanical testing system with a custom jig, and were loaded in axial compression for 106 cycles at 10 Hz or until failure at 6–60 N for the 1.5/2.0 mm VCP and 10–100 N for the 2.0/2.7 mm VCP. Differences in number of cycles, stiffness, and failure mode were recorded.
Results— All construct failures occurred through a screw hole adjacent to the gap. Fully stacked and 4-hole stacked 1.5/2.0 and 2.0/2.7 mm VCP withstood 106 cycles. Fatigue life and stiffness of the 1.5/2.0 or 2.0/2.7 mm unstacked constructs were significantly less than the other constructs. Differences were identified in stiffness among the 1.5/2.0 mm stacked constructs and in fatigue life among the 2.0/2.7 mm VCP stacked constructs.
Conclusion— Four-hole partially stacked VCP (either 1.5/2.0 or 2.0/2.7 mm) have comparable mechanical properties to fully stacked VCP.
Clinical Relevance— Partial stacking of 2 holes of VCP on both sides of the fracture gap may provide sufficient strength for healing, but this premise must be tested in vivo.