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Journal of Bone and Joint Surgery, 1962;44:918-930.
© 1962 by The Journal of Bone and Joint Surgery, Inc

Coxa Plana in the Dog

A Preliminary Report of a Clinical, Roentgenographic, Histological, and Microangiographic Study

Anders Hulth M.D.1, Ingemar Norberg V.M.D.2, and Sten-Erik Olsson V.M.D., M.D.2

1 Orthopaedic Clinic and the Department of Pathology II, University of Uppsala
2 Department of Radiology, Royal Veterinary College, Stockholm

The authors describe coxa plana in the dog with the aid of clinical examination, roentgenograms, histological examination, and microangiographs. In both dog and man the condition appears basically to be an aseptic necrosis in the capital femoral epiphysis with all its typical histological characteristics. Microangiography reveals the non-vascular state of the epiphysis together with hypervascularization of all the surrounding tissue. The hypervascularization probably represents an attempt to revascularize the dead bone, but this is delayed by the capital femoral epiphysis being poorly accessible to blood vessels because of the articular cartilage and the avascular epiphyseal cartilage.


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