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Vet Comp Orthop Traumatol 2015; 28(04): 240-249
DOI: 10.3415/VCOT-14-08-0128
Original Research
Schattauer GmbH

Histological and immunohistological analysis of degenerative changes in the cranial cruciate ligament in a canine model of excessive tibial plateau angle

T. Ichinohe
1   Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan
,
N. Kanno
1   Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan
,
Y. Harada
1   Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan
,
T. Yogo
1   Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan
,
M. Tagawa
1   Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan
,
Y. Hara
1   Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan
› Author Affiliations
Further Information

Publication History

Received:20 August 2014

Accepted:07 April 2015

Publication Date:
28 December 2017 (online)

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Summary

Objective: To create a canine model of excessive tibial plateau angle (eTPA) and assess the chondroid metaplasia and extracellular matrix alteration in the cranial cruciate ligament.

Methods: Seven mature female Beagles were included. Cylindrical osteotomy was performed bilaterally in the proximal tibia. The TPA was increased to approximately 40° in the left tibia (eTPA stifle) and left unchanged in the right tibia (control stifle). Exercise stress was started at three months postoperatively, and at 12 months postoperatively the dogs were euthanatized and the cranial cruciate ligaments were collected. The specimens were subjected to haematoxylin and eosin staining to assess the ligamentocyte morphology and immunostaining to assess the type I (COLI), type II (COLII), and type III (COLIII) collagen, and the sry-type HMG box 9 (SOX9) staining.

Results: Macroscopic cranial cruciate ligament injury was absent in six dogs but present in the eTPA stifle of one dog, which was excluded from the analysis. The ligamentocyte density decreased and the percentage of round ligamentocytes increased in the eTPA stifles. The COLII, COLIII, and SOX9 staining increased significantly and COLI deposition decreased in the eTPA stifles compared to the control stifle.

Clinical significance: The extracellular matrix changed, COLI deposition decreased, and COLIII and SOX9 staining increased in the cranial cruciate ligament of the eTPA stifles. SOX9 may contribute to COLII synthesis in the extracellular matrix of the cranial cruciate ligament in eTPA stifles, and eTPA may promote chondroid metaplasia and extra -cellular matrix alteration.

Keywords

Cranial cruciate ligament - dog - excessive tibial plateau angle - extracellular matrix - chondroid metaplasia
 

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