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Vet Surg. 2019 Aug 2. doi: 10.1111/vsu.13300. [Epub ahead of print]

The effect of tibial plateau leveling osteotomy on patellofemoral kinematics in dogs: An in vivo study.

Author information

1
Comparative Orthopaedics Biomechanics Laboratory, College of Veterinary Medicine, University of Florida, Gainesville, Florida.
2
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida.

Abstract

OBJECTIVE:

To quantitatively evaluate patellofemoral (PF) kinematics during walking in dogs with cranial cruciate ligament (CrCL) deficiency treated by tibial plateau leveling osteotomy (TPLO).

STUDY DESIGN:

Longitudinal observational study.

ANIMALS:

Dogs with unilateral CrCL deficiency treated by TPLO (n = 10).

METHODS:

Horizontal beam fluoroscopic images of the stifles during treadmill walking were acquired 6 months after TPLO. Computed tomography was performed, and digitized bone models of both femurs and patellae were created. These digital models were superimposed over the fluoroscopic images with shape-matching software, and sagittal plane PF kinematics for TPLO-treated and normal contralateral stifles were calculated. Patellofemoral kinematics were described according to phase of gait cycle as well as relative to femorotibial flexion angle.

RESULTS:

In TPLO-treated stifles, there was an approximately 1-mm increase in cranial displacement of the patella (P < .05) compared with the normal stifle at equivalent femorotibial flexion angles between 120° and 140° and predominately during the stance phase. Proximal-distal translation and patellar flexion angle were mostly unaffected by TPLO when they were assessed according to either equivalent phase of gait cycle or femorotibial flexion angles.

CONCLUSION:

In vivo PF kinematics in TPLO-treated stifles were subtly different from normal, characterized by slight cranial shifting of the patella relative to the trochlear groove.

CLINICAL SIGNIFICANCE:

The clinical significance of these results remains unknown. These results may provide further understanding into extensor mechanism abnormalities associated with TPLO.

PMID:
31373719
DOI:
10.1111/vsu.13300

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