Osteochondrosis lesions of the lateral trochlear ridge of the distal femur in four ponies

Voute, L.C., Henson, F.M.D., Platt, D. and Jeffcott, L.B. (2011) Osteochondrosis lesions of the lateral trochlear ridge of the distal femur in four ponies. Veterinary Record, 168(10), p. 265. (doi:10.1136/vr.c6677)

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Abstract

Lesions of the lateral trochlear ridge (LTR) of the distal femur were investigated in four pony or pony cross horses. The animals were all geldings and were six to 15 months of age. Lesions were bilateral in three ponies and unilateral in one. Femoropatellar joint effusion and lameness were present in two ponies; clinical signs were absent in the others. The proximal LTR was affected in all four animals. The radiographic appearance of the lesions was a subchondral defect containing mineralised bodies. Arthroscopic and postmortem examination findings included an osteochondral flap, a fissured or irregular articular surface and a smooth surface overlying focally thickened cartilage that extended into subchondral bone. Thickened articular cartilage was a histological feature of all the lesions. Among the other histological features, the most common were chondronecrosis, chondrocyte clusters, phenotypically abnormal chondrocytes, horizontal fissures at the osteochondral junction and retained blood vessels. The signalment of the four ponies, their clinical signs and the pathological features of their lesions were consistent with osteochondrosis of the LTR in horses. The use of multiple criteria was considered to be important in making a specific diagnosis.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Voute, Dr Lance
Authors: Voute, L.C., Henson, F.M.D., Platt, D., and Jeffcott, L.B.
College/School:College of Medical Veterinary and Life Sciences > School of Veterinary Medicine
Journal Name:Veterinary Record
Publisher:B M J Group
ISSN:0042-4900
ISSN (Online):2042-7670
Published Online:25 February 2011
Copyright Holders:Copyright © 2011 BMJ Publishing Group
First Published:First published in Veterinary Record 168(10):265
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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