Effect of osteoarthritis on the repeatability of patella tendon angle measurement in dogs

Homer, L. M., Gomes, B. A.J., Murphy, M. C., Hammond, G. J.C. , Parkin, T. D.H. and Broome, C. J.A. (2018) Effect of osteoarthritis on the repeatability of patella tendon angle measurement in dogs. Veterinary Surgery, (doi:10.1111/vsu.13118) (PMID:30422355) (Early Online Publication)

Homer, L. M., Gomes, B. A.J., Murphy, M. C., Hammond, G. J.C. , Parkin, T. D.H. and Broome, C. J.A. (2018) Effect of osteoarthritis on the repeatability of patella tendon angle measurement in dogs. Veterinary Surgery, (doi:10.1111/vsu.13118) (PMID:30422355) (Early Online Publication)

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Abstract

Objective: To evaluate the influence of osteoarthritis on the measurement of patella tendon angle (PTA) and determine intraobserver and interobserver variability. Study design: Retrospective clinical study. Sample population: Eighty‐seven mediolateral radiographs that were obtained prior to tibial tuberosity advancement. Methods: Radiographic osteoarthritis was scored by 2 observers using guidelines derived from the International Elbow Working Group Protocol. Patella tendon angle was measured by 3 observers on 3 occasions, with at least 7 days between measurements. The data were statistically analyzed via weighted κ and Kruskal‐Wallis testing. Results: A fair strength of agreement was found among observers scoring osteoarthritis, with the same grades in 48% of radiographs. The intraobserver average bias between PTA measurements 1 and 3 ranged from −0.38° to −0.94°. Interobserver bias in angle measurement ranged from −0.92° to −2.00°. Observer 1 had the narrowest range of PTA differences (12.1°), and observer 3 had the highest range of PTA differences (23.5°). Observer 2 had the lowest mean bias (−0.38°). The mean bias was lowest between observers 1 and 2 (−0.92°) and highest between observers 1 and 3 (−2.0°). The mean intraobserver standard deviation of the PTA measurement differences was 2.90°, and interobserver standard deviation of the PTA measurement differences was 2.26°. The degree of osteoarthritis did not influence PTA measurements or their variability. Conclusion: The current study did not find evidence of an influence of osteoarthritis on PTA or on the repeatability of measurements. Clinical significance: Our findings suggest that osteoarthritis should not affect the radiographic planning for tibial tuberosity advancement surgery. The high variances in PTA measurement in less experienced observers may influence the clinical outcome of surgery.

Item Type:Articles
Status:Early Online Publication
Refereed:Yes
Glasgow Author(s) Enlighten ID:Broome, Mr Cameron and Murphy, Megan Cooper and Parkin, Professor Timothy and Hammond, Mr Gawain
Authors: Homer, L. M., Gomes, B. A.J., Murphy, M. C., Hammond, G. J.C., Parkin, T. D.H., and Broome, C. J.A.
College/School:College of Medical Veterinary and Life Sciences > School of Veterinary Medicine
Journal Name:Veterinary Surgery
Publisher:Wiley
ISSN:0161-3499
ISSN (Online):1532-950X
Published Online:13 November 2018
Copyright Holders:Copyright © 2018 The American College of Veterinary Surgeons
First Published:First published in Veterinary Surgery 2018
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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