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The Effect of Tibial Plateau Angle on Ground Reaction Forces 4–17 Months After Tibial Plateau Leveling Osteotomy in Labrador Retrievers

Authors

  • DUANE A. ROBINSON DVM,

    1. From the 1Veterinary Orthopaedic Research Laboratory, Department of Veterinary Clinical Sciences, and the Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
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  • 1 DAVID R. MASON BVetMed, MRCVS,

    1. From the 1Veterinary Orthopaedic Research Laboratory, Department of Veterinary Clinical Sciences, and the Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
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  • 1 RICHARD EVANS PhD,

    1. From the 1Veterinary Orthopaedic Research Laboratory, Department of Veterinary Clinical Sciences, and the Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
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  • and 1 MICHAEL G. CONZEMIUS DVM, PhD, Diplomate ACVS 1

    1. From the 1Veterinary Orthopaedic Research Laboratory, Department of Veterinary Clinical Sciences, and the Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
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  • Presented at the 31st Annual Meeting of the Veterinary Orthopedic Society, Big Sky, MT, February 2004.

  • Dr. Mason's current address: Las Vegas Veterinary Referral Center, 8650 W. Tropicana Avenue, Suite B-107, Las Vegas, NV.

Address reprint requests to Dr. Michael G Conzemius, DVM, PhD, Diplomate ACVS, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011. E-mail: conz@iastate.edu.

Abstract

Objective— To assess the relationship between postoperative tibial plateau angle (TPA) and ground reaction forces (GRFs) in Labrador Retrievers at least 4-months after tibial plateau leveling osteotomy (TPLO) surgery.

Study Design— A retrospective longitudinal study.

Animals— Thirty-two Labrador Retrievers with unilateral cranial cruciate ligament disease that had TPLO and concurrent meniscal surgery.

Methods— TPA and GRFs were measured pre- and ≥4 months postoperatively. Preoperative GRFs, preoperative TPA, duration of injury, postoperative TPA and degree of rotation were each compared with postoperative GRFs using correlation analysis. Dogs were also grouped by postoperative TPA and compared using 1-way analysis of variance (ANOVA). Postoperative function was compared with meniscal release/meniscectomy, patient age, sex, body weight and follow-up time using ANOVA.

Results— No significant relationship was found between preoperative GRFs, preoperative TPA, duration of injury, postoperative TPA, degree of rotation, or meniscal release/meniscectomy and postoperative function. Mean preoperative GRFs for all dogs were 28.8±9.5 for peak vertical force (PVF) and 9.3±3.1 for peak vertical impulse (VI). Mean postoperative GRFs for all dogs were 40.4±5.0 for PVF and 14.1±1.9 for VI.

Conclusions— No statistically significant relationship was found between postoperative TPA and GRFs after TPLO ≥4 months after surgery, where the postoperative angle was between 0 and 14°. No significant relationship was found between the preoperative TPA and postoperative function.

Clinical Relevance— Limb function in Labrador Retrievers was not affected by postoperative TPA and re-operation for cases with a postoperative TPA between 0 and 14° is not recommended.

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