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

• DOI: 10.1136/vr.c6677
• Publication Date: 2011-02-26T02:22:12Z
• Authors: L. C. Voute; F. M. D. Henson; D. Platt; L. B. Jeffcott
• Keywords: Pony; Osteochondrosis; Osteochondritis dissecans; Chondropathy; Osteochondritis; Subchondral bone

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