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The effect of tibial tuberosity distalization, femoral shortening, and tibial plateau leveling osteotomy on the canine stifle extensor mechanism

Drew, Jarrod (2017) The effect of tibial tuberosity distalization, femoral shortening, and tibial plateau leveling osteotomy on the canine stifle extensor mechanism. Other thesis, Murdoch University.

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Abstract

Introduction: This body of work examines the effect of several tibial osteotomy procedures on the stifle extensor mechanism load in a canine ex vivo load-bearing limb press model.

Objectives: The objective of our first study was to evaluate the effect of tibial tuberosity distalization and femoral shortening on stifle extensor mechanism load. We sought to determine the femoral shortening to tibial tuberosity distalization ratio that would enable the tibial tuberosity to be distalized without a significant difference in stifle extensor mechanism load. The case report documents successful application of the combined transverse femoral ostectomy and tibial tuberosity distalization technique for correction of medial patella luxation and patella alta in dogs. The objective of our second study was to measure the effect of tibial plateau leveling osteotomy on stifle extensor mechanism load.

Materials and Methods: In the first study, the tibial tuberosity was distalized in increments equivalent to 5% of the patella length until it had been distalized to 100% of the patella length. After each tibial tuberosity distalization increment, the femur would be shortened an equivalent distance before returning to starting femoral length. The femoral shortening to tibial tuberosity distalization ratio was calculated. 4 In the second study, the proximal tibial segment was incrementally rotated until the anatomic tibial plateau angle had been rotated to at least 1°. The proportional change in stifle extensor mechanism load between the anatomic tibial plateau angle and the neutralized (approximately 6.5°) and over-rotated (approximately 1°) tibial plateau angle was analysed.

Results: Tibial tuberosity distalization without femoral ostectomy incrementally increased mean stifle extensor mechanism load from baseline (P≤.05). The femoral shortening to tibial tuberosity distalization combinations that were not significantly different from baseline (P>.05) ranged between 0.5 – 1.0. There was no significant difference in stifle extensor mechanism load from the anatomic tibial plateau angle to the neutralized tibial plateau angle (P=.81) or from the anatomic tibial plateau angle to the over-rotated tibial plateau angle (P=.67).

Conclusions: The femoral shortening to tibial tuberosity distalization ratio that enabled the tibial tuberosity to be distalized without a significant difference in stifle extensor mechanism load was found to range between 0.5 – 1.0. Tibial plateau leveling osteotomy did not significantly alter stifle extensor mechanism load in the cruciate-intact stifle.

Item Type: Thesis (Other)
Murdoch Affiliation: School of Veterinary and Life Sciences
Notes: Research Masters with Training
Supervisor(s): Glyde, Mark and Hosgood, Giselle
URI: http://researchrepository.murdoch.edu.au/id/eprint/42163
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