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33rd Annual Scientific Meeting proceedings
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Session:
Date/Time: 30-11--0001 (00:00 - 00:00)
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Proximal osteochondroma of the plantar sagittal ridge of the MTIII with severe synovial lesions in a warmblood horse.
Willems T, De Beauregard T*, Sureda S, De Lange L
Clinique Equine de Meslay, Meslay-du-Maine, France.
Objectives:
Osteochondromas are known to mostly affect the caudal aspect of the distal radial metaphysis and possibly results in flexor tendon lesions and/or effusion of the carpal sheath. The exact etiology is unknown, but several theories have been suggested.
Methods:
A 7-year-old warmblood gelding was presented for persistent hindlimb lameness at work. On presentation a marked distention of the left hind fetlock was noted with a lameness grade 3/5 (AAEP) and a positive flexion. Radiographic examination revealed a dorsomedial fragmentation of P1, a proximal bony exostosis on the plantar part of the sagittal ridge of MTIII and a small apical fragment of the lateral sesamoid bone. Arthroscopic surgery revealed severe cartilage lesions of the condyles and of the articular surface of the sesamoid bones with lesions of the intersesamoid ligament. For the plantar approach the hindlimb was flexed and the exostosis was found at the proximal third of the sesamoid bones. The exostosis and fragments were arthroscopically removed.
Results:
Histological examination revealed well-differentiated bone tissue surmounted by well-differentiated cartilage tissue with irregularly arranged chondrocytes. The cartilage is subject to endochondral ossification. The peripheric synovial membrane is fibrotic and showed signs of lymphoplasmocytic inflammation. This benign proliferative osteocartilaginous lesion is histologically suggestive of osteochondroma.
Conclusions:
This is the first case report of an osteochondroma on the distal part of the MTIII with successful arthroscopic removal. Intra-articular osteochondromas can be accompanied with synovial lesions and may necessitate surgical removal. Long-term post operative follow up will be necessary to evaluate orthopedic soundness.
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