Examination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.

<h4>Objective</h4>To determine the influence of anatomical features of the distal femur on the proximodistal patellar position and compare the proximodistal patellar position between dogs with and without medial patellar luxation (MPL).<h4>Study design</h4>Retrospective case...

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Autores principales:	Sawako Murakami, Masakazu Shimada, Yasuji Harada, Yasushi Hara
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d5cf25e74f4448758b8db4a4c4111726
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spelling	oai:doaj.org-article:d5cf25e74f4448758b8db4a4c41117262021-12-02T20:11:11ZExamination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.1932-620310.1371/journal.pone.0252531https://doaj.org/article/d5cf25e74f4448758b8db4a4c41117262021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0252531https://doaj.org/toc/1932-6203<h4>Objective</h4>To determine the influence of anatomical features of the distal femur on the proximodistal patellar position and compare the proximodistal patellar position between dogs with and without medial patellar luxation (MPL).<h4>Study design</h4>Retrospective case series (n = 71).<h4>Methods</h4>Mediolateral-view radiographs of clinical cases of dogs weighing less than 15 kg were obtained. The stifle joint angle, patellar ligament length, patellar length, size of the femoral condyle, trochlear length, and trochlear angle were measured and included in multiple linear regression analyses to ascertain their effects on the proximodistal patellar position. Radiographs were divided into MPL and control groups. The effects of MPL on the proximodistal patellar position and morphological factors were also examined.<h4>Results</h4>The final model for the proximodistal patellar position revealed that the patella became distal as the ratio of the patellar ligament length to patellar length decreased, the trochlear angle relative to the femur increased, the trochlear length relative to the patellar length increased, or the trochlear length relative to the femoral condyle width decreased. The proximodistal patellar position in the MPL group was not significantly different from that in the control group despite the trend towards a distally positioned patella (p = 0.073). The MPL group showed a significantly shorter trochlea (p<0.001) and greater trochlear angle relative to the femur (p = 0.029) than the control group.<h4>Conclusion</h4>The proximodistal patellar position depends on multiple factors, and its determination based on PLL/PL alone may not be appropriate. Dogs with MPL did not have a proximally positioned patella compared with dogs without MPL. Although hindlimbs with MPL had a shorter trochlea than those without patellar luxation, this difference did not appear to be sufficient to displace the patellar position proximally in small dogs, possibly compensated by increased trochlear angle relative to the femur.Sawako MurakamiMasakazu ShimadaYasuji HaradaYasushi HaraPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 5, p e0252531 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sawako Murakami Masakazu Shimada Yasuji Harada Yasushi Hara Examination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.
description	<h4>Objective</h4>To determine the influence of anatomical features of the distal femur on the proximodistal patellar position and compare the proximodistal patellar position between dogs with and without medial patellar luxation (MPL).<h4>Study design</h4>Retrospective case series (n = 71).<h4>Methods</h4>Mediolateral-view radiographs of clinical cases of dogs weighing less than 15 kg were obtained. The stifle joint angle, patellar ligament length, patellar length, size of the femoral condyle, trochlear length, and trochlear angle were measured and included in multiple linear regression analyses to ascertain their effects on the proximodistal patellar position. Radiographs were divided into MPL and control groups. The effects of MPL on the proximodistal patellar position and morphological factors were also examined.<h4>Results</h4>The final model for the proximodistal patellar position revealed that the patella became distal as the ratio of the patellar ligament length to patellar length decreased, the trochlear angle relative to the femur increased, the trochlear length relative to the patellar length increased, or the trochlear length relative to the femoral condyle width decreased. The proximodistal patellar position in the MPL group was not significantly different from that in the control group despite the trend towards a distally positioned patella (p = 0.073). The MPL group showed a significantly shorter trochlea (p<0.001) and greater trochlear angle relative to the femur (p = 0.029) than the control group.<h4>Conclusion</h4>The proximodistal patellar position depends on multiple factors, and its determination based on PLL/PL alone may not be appropriate. Dogs with MPL did not have a proximally positioned patella compared with dogs without MPL. Although hindlimbs with MPL had a shorter trochlea than those without patellar luxation, this difference did not appear to be sufficient to displace the patellar position proximally in small dogs, possibly compensated by increased trochlear angle relative to the femur.
format	article
author	Sawako Murakami Masakazu Shimada Yasuji Harada Yasushi Hara
author_facet	Sawako Murakami Masakazu Shimada Yasuji Harada Yasushi Hara
author_sort	Sawako Murakami
title	Examination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.
title_short	Examination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.
title_full	Examination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.
title_fullStr	Examination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.
title_full_unstemmed	Examination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.
title_sort	examination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/d5cf25e74f4448758b8db4a4c4111726
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Examination of the proximodistal patellar position in small dogs in relation to anatomical features of the distal femur and medial patellar luxation.

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