An in vitro mechanical comparison of tibial plateau levelling osteotomy plates

J. Bordelon; D. Coker; M. Payton; M. Rochat

doi:10.3415/VCOT-08-04-0041

Veterinary and Comparative Orthopaedics and Traumatology, Inhaltsverzeichnis

Vet Comp Orthop Traumatol 2009; 22(06): 467-472
DOI: 10.3415/VCOT-08-04-0041

Original Research

Schattauer GmbH

An in vitro mechanical comparison of tibial plateau levelling osteotomy plates

J. Bordelon

¹Department of Veterinary Clinical Sciences, Center of Veterinary Health Sciences, Oklahoma State University, Stillwater, Oklahoma, USA

,

D. Coker

²Department of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, Oklahoma, USA

,

M. Payton

³Graduate College, Department of Mathematics and Statistics, Oklahoma State University Stillwater, Oklahoma, USA

,

M. Rochat

¹Department of Veterinary Clinical Sciences, Center of Veterinary Health Sciences, Oklahoma State University, Stillwater, Oklahoma, USA

› Institutsangaben

Abstract

Summary

An in vitro mechanical study was performed to compare the fatigue properties and the loads to failure of four plate designs that are used to stabilise the tibial plateau levelling osteotomy (TPLO). Seventy-two gapped osteotomy models were created using 3.5 mm versions of the following plates: a standard TPLO plate, a low profile TPLO plate, a locking TPLO plate (LocP), and a broad locking TPLO plate (bLocP). The 18 constructs for each plate design were sub-divided into three identical groups of six. Six constructs were mounted in a materials testing device and subjected to cyclic compressive loading until failure was observed or one-million cycles were achieved. Additionally, six constructs of each plate design were tested in compressive axial loading and six others in four-point bending in a load-to-failure manner. To provide residual strength comparisons, the six constructs undergoing cyclic fatigue compression testing were also tested in axial compressive loading. There were not any significant differences in stiffness between plates tested in axial compressive loading. However, mean loads at failure were higher for the LocP and bLocP constructs. The bLocP had a significantly higher mean stiffness and mean load at failure compared to the other constructs tested in fourpoint bending.

Keywords

TPLO - cranial cruciate ligament - biomechanics - plate

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Referenzen

References
1 Hayashi K, Manley PA, Muir P. Cranial cruciate ligament pathophysiology in dogs with cruciate disease: a review. J Am Anim Hosp Assoc 2004; 40: 385-390.
2 Slocum B, Slocum TD. Tibial plateau leveling osteotomy for repair of cranial cruciate ligament rupture in the canine. Vet Clin North Am 1993; 23: 777-795.
3 Slocum B, Slocum TD. Tibial plateau leveling osteotomy for cranial cruciate ligament. In Current Techniques in Small Animal Surgery. 4^th ed Bojarab MJ. (ed). Baltimore, MD: Williams and Wilkins; 1998: 1209-1215.
4 Stauffer KD, Tuttle TA, Elkins AD. et al Complications associated with 696 tibial plateau leveling osteotomies (2001–2003). J Am Anim Hosp Assoc 2006; 42: 44-50.
5 Pacchiana PD, Morris E, Gillings SL. et al Surgical and postoperative complications associated with tibial plateau leveling osteotomy in dogs with cranial cruciate ligament rupture: 397 cases (1998–2001). J Am Vet Med Assoc 2003; 222: 184-193.
6 Priddy NH, Tomlinson JL, Dodam JR. et al Complications with and owner assessment of the outcome of tibial plateau leveling osteotomy for treatment of cranial cruciate ligament rupture in dogs: 193 cases (1997–2001). J Am Vet Med Assoc 2003; 222: 1726-1732.
7 Kloc PA, Kowaleski MP, Litsky AS. et al Biomechanical comparison of two alternative tibial plateau leveling osteotomy plates with the original standard in an axially loaded gap model: An in vitro study. Vet Surg 2009; 38: 40-48.
8 Brunner H, Simpson JP. Fatigue fracture of bone plates. Injury 1980; 11: 203-207.
9 Ness MG. The effect of bending and twisting on the stiffness and strength of the 3.5 SOP implant. Vet Comp Orthop Traumatol 2009; 2: 132-136.
10 Silbernagel JT, Kennedy SC, Johnson AL. et al Validation of canine cancellous and cortical polyurethane foam bone models. Vet Comp Orthop Traumatol 2002; 4: 200-204.
11 Silbernagel JT, Johnson AL, Pijanowski GJ. et al A mechanical comparison of 4.5 narrow and 3.5 broad plating systems for stabilization of gapped fracture models. Vet Surg 2004; 33: 173-179.
12 Hildreth III BE, Marcellin-Little DJ, Roe SC. et al An in vitro evaluation of five canine tibial plateau leveling methods. Am J Vet Res 2006; 67: 693-700.
13 DeTora M, Kraus K. Mechanical testing of 3.5 mm locking and non-locking bone plates. Vet Comp Orthop Traumatol 2008; 21: 1-5.
14 Gardner MJ, Brophy RH, Campbell D. et al The mechanical behavior of locking compression plates compared with the dynamic compression plates in a cadaver radius model. J Orthop Trauma 2005; 19: 597-603.
15 Gardner MJ, Griffith MH, Demetrakopoulos D. et al Hybrid locked plating of osteoporotic fractures of the humerus. J Bone Joint Surg Br 2006; 88A: 1962-1967.