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Vet Comp Orthop Traumatol 2010; 23(02): 128-133
DOI: 10.3415/VCOT-09-06-0066
Case Report
Schattauer GmbH

A case of bilateral patellar osteochondrosis and fracture in a cat

Clinical and histological findings
S. Palierne
1   Ecole Nationale Vétérinaire, University of Toulouse, Department of Clinical Sciences, Small Animal Surgery, Toulouse, France
,
F. Palissier
1   Ecole Nationale Vétérinaire, University of Toulouse, Department of Clinical Sciences, Small Animal Surgery, Toulouse, France
,
I. Raymond-Letron
1   Ecole Nationale Vétérinaire, University of Toulouse, Department of Clinical Sciences, Small Animal Surgery, Toulouse, France
,
A. Autefage
1   Ecole Nationale Vétérinaire, University of Toulouse, Department of Clinical Sciences, Small Animal Surgery, Toulouse, France
› Author Affiliations
Further Information

Publication History

Received: 24 June 2009

Accepted: 01 February 2009

Publication Date:
19 December 2017 (online)

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Summary

Fracture of the patella associated with bilateral osteochondrosis of the superior pole of the patella in a 14-week-old cat is reported with histological findings.

Patellar osteochondrosis has been described in humans, horses, pigs, and dogs and is char-acterised by incomplete union of the ossification centres related to an abnormal process of endochondral ossification. However this disease has not yet been described in cats. Macroscopically, two main fragments separated by interposed tissue were identified on the left patella. In contrast, no fracture but only a fissuration of the articular cartilage was observed on the right patella. Bilateral partial patellectomy was performed. Histological examination of the excised fragments from the left patella revealed two main areas of trabecular bone separated by a wide irregular band of hyaline cartilage. The microscopic aspect of the right patella was similar to that of the left. Serial sections showed the initial appearance of an area of necrosis in the central band of hyaline cartilage, and that this hyaline cartilage was subsequently replaced by fibrovascular connective tissue.

These findings indicate that some patellar fractures may be due to patellar osteochondrosis.

Keywords

Patella - fracture - osteochondrosis - cat
 

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