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DOI: 10.3415/VCOT-11-05-0077
In vitro mechanical evaluation of a limited contact dynamic compression plate and hybrid carpal arthrodesis plate for canine pancarpal arthrodesis
Publication History
Received
24 May 2011
Accepted
27 September 2011
Publication Date:
23 December 2017 (online)
Summary
Objective: To compare the mechanical properties of pancarpal arthrodesis (PCA) constructs stabilized at 20° of extension using either a 3.5 mm limited contact dynamic compression plate (LC-DCP) or a 3.5/2.7 mm hybrid plate (HP).
Methods: Seven forelimb pairs were used from dogs of similar size. All soft tissues were removed except for supporting structures of the carpus and proximal metacarpal region. All plates were accurately bent to 20°, and then instrumented with two, 350Ω strain gauges applied at the level of the bend. Constructs were embedded in epoxy moulds then mounted onto a servo-hydraulic testing machine. Specimens were loaded for 10 cycles at 100N, 200N and 300N. Tenth cycle construct compliance (CC), maximum angular deformation (MAD), and peak plate strain (PPS) were compared using two-factor analysis of variance (ANOVA) and Student-Newman- Keuls post-hoc tests (p <0.05).
Results: Regardless of load, CC was 29% to 33% smaller in the HP than the LC-DCP group (p <0.03). In each group, the CC significantly increased with increasing loads (p <0.02). Mean MAD was 19% to 22% less in HP than LC-DCP constructs, with significant differences seen at 200N and 300N loads. In both groups, MAD was significantly greater with increasing loads (p <0.02). In addition, PPS was 37% to 43% smaller for HP than LC-DCP.
Clinical significance: The mechanical advantages of the HP over the LC-DCP make it a viable alternative for PCA. Smaller CC, MAD and PSS of the HP may reduce the risk of implant failure and postoperative morbidity following PCA.
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References
- 1 Parker RB, Brown SG, Wind AP. Pancarpal arthrodesis in the dog: a review of forty-five cases. Vet Surg 1981; 10: 35-43.
- 2 Lesser AS. Arthrodesis. In: Slatter D. editor. Textbook of Small Animal Surgery. Philadelphia: Saunders; 2003. pg. 2174-2176.
- 3 Gambarella PC, Griffiths RC. Treatment of hyperextension injuries of the canine carpus. Compend Contin Educ Pract Vet 1982; 5: 127-131.
- 4 Early T. Canine carpal ligament injuries. Vet Clin North Am 1978; 8: 183-199.
- 5 Diaz-Bertrana C, Darnaculleta F, Durall I. et al. The stepped hybrid plate for carpal panarthrodesis - Part I: relationship between plate and bone surfaces. Vet Comp Orthop Traumatol 2009; 22: 380-388.
- 6 Buote NJ, McDonald D, Radasch RM. Pancarpal and partial carpal arthrodesis. Compend Contin Educ Pract Vet 2009; 31: 180-192.
- 7 Clarke SP, Ferguson JF, Miller A. Clinical evaluation of pancarpal arthrodesis using a CastLess plate in 11 dogs. Vet Surg 2009; 38: 852-860.
- 8 Diaz-Bertrana C, Darnaculleta F, Durall I. et al. The stepped hybrid plate for carpal panarthrodesis - Part II: a multicentre study of 52 arthrodeses. Vet Comp Orthop Traumatol 2009; 22: 389-397.
- 9 Li A, Gibson N, Carmichael S. et al. Thirteen pancarpal arthrodesis using 2.7/3.5 mm hybrid dynamic compression plates. Vet Comp Orthop Traumatol 1999; 12: 102-107.
- 10 Whitelock RG, Dyce J, Houlton JE. Metacarpal fractures associated with pancarpal arthrodesis in dogs. Vet Surg 1999; 28: 25-30.
- 11 Chambers JN, Bjorling DE. Palmar surface plating for arthrodesis of the canine carpus. J Am Anim Hosp Assoc 1982; 18: 25-30.
- 12 Guerrero TG, Montavon PM. Medial plating for carpal panarthrodesis. Vet Surg 2005; 34: 153-158.
- 13 Perren SM, Klaue K, Pohler O. et al. The limited contact dynamic compression plate (LC-DCP). Arch Orthop Trauma Surg 1990; 109: 304-310.
- 14 Worth AJ, Bruce WJ. Long-term assessment of pancarpal arthrodesis performed on working dogs in New Zealand. N Z Vet J 2008; 56: 78-84.
- 15 Wininger FA, Kapatkin AS, Radin A. et al. Failure mode and bending moment of canine pancarpal arthrodesis constructs stabilized with two different implant systems. Vet Surg 2007; 36: 724-728.
- 16 Hottinger HA, DeCamp CE, Olivier NB. et al. Noninvasive kinematic analysis of the walk in healthy large-breed dogs. Am J Vet Res 1996; 57: 381-388.
- 17 DeCamp CE. Kinetic and kinematic gait analysis and the assessment of lameness in the dog. Vet Clin North Am Small Anim Pract 1997; 27: 825-840.
- 18 Sinnott MT. In vitro biomechanical analysis of several joint and fracture fixation techniques [thesis]. East Lansing: Michigan State University; 2006. .
- 19 Muir P, Johnson KA, Markel MD. Area moment of inertia for comparison of implant cross-sectional geometry and bending stiffness. Vet Comp Orthop Traumatol 1995; 8: 146-152.
- 20 Guillou RP, Frank JD, Sinnott MT. et al. In vitro mechanical evaluation of medial plating for pantarsal arthrodesis in dogs. Am J Vet Res 2008; 69: 1406-1412.