Thu 24 April 2014

Primary synovial osteochondromatosis of the stifle in an English Mastiff.

Smith TJ, Baltzer WI, Löhr C, Stieger-Vanegas SM. Tom J. Smith, MA, VetMB, CertSAS, MRCVS, Veterinary and Biomedical Sciences, James Cook University, Townsville, QLD 4811, Australia, Phone: +61 747 814 562, E-mail: VCOT 2012 Mar 25 2 160-6
A two-year-old, 97 kg, male neutered English Mastiff was evaluated for left pelvic limb lameness of five months duration localized to the stifle joint. Following radiographic, computed tomographic and arthroscopic examination, the lameness was subsequently diagnosed as being caused by primary synovial osteochondromatosis. In total, 194 osteochondral bodies were removed using arthroscopy in combination with a mini-arthro-tomy. Histology and immunohistochemistry of the loose osteochondral fragments confirmed the diagnosis with a moderately high degree of differentiation and low cellularity. Nuclear staining for Ki-67 revealed decreasing differentiation and increasing cellularity in the fragments. At the 13 months telephone follow-up the owner reported that the dog was free from lameness and had a vastly improved function compared with preoperative levels, although mild lameness did occasionally occur. This is the first report of computed tomography, arthroscopy and immunohistochemistry confirming a case of primary synovial osteochondromatosis in a dog.

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