Arthroscopic surgery for carpal chip fractures in Thoroughbred racehorses was performed from 1993 to 2001. The prognosis after surgery and subsequent racing performance were surveyed.
The following parameters were surveyed: the rate to return to race, the time to return to race, the number of starts and earning money after surgery. The affected joints were 244 in 228 racing Thoroughbreds, including 20 unraced horses. The number of lesions was 320 and the main lesion incidence was distal lateral radius 139 (43.4%), proximal intermediate carpal bone 43 (13.4%), distal medial radius 32 (10.0%), distal radial carpal bone 48 (15.0%) and proximal third carpal bone 48 (15.0%).
The total rate to return the race was 89.9%, in which the rate of raced horses was 92.8% and the rate of raced horses without the horses that did not race for other reasons was 95.1%. The rate to race of the previously unraced horses was 60%. The average time to return the race was 239.3 days, the average number of starts was 12.5 starts and the average earning money was 13, 820, 000 yen.
The lesion incidence of the carpal chip fractures of the racing Thoroughbreds was found to be the same as the previous reports.
The prognosis for racing performance following arthroscopic surgery for carpal chip fractures in racehorses was found to be excellent.

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A nine-year-old male mongrel dog was referred for chronic progressive paraparesis. MR images demonstrated an intradural extramedullary mass at the 12th thoracic vertebra. Hemilaminectomy was performed to remove the mass, which was histopathologically diagnosed as lipoma. The dog was recovered completely after 3 weeks of the surgery, and neither neurological problems nor recurrence was observed 24 months after surgery.

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A 7-year-old American cocker spaniel was presented for evaluation of a subcutaneous mass at right zygomaticofacial area. Histopathological examination of the biopsy sample indicated that the mass lesion was fibroma. The mass rapidly grew up twice in size for 45 days after the first admission and was removed surgically. The histological appearance of the mass was almost in conformity with that of the first biopsy sample. However, recurrent tumor gradually invaded into the orbital, nasal, and oral area with bone absorption. The dog was euthanized 9 months after the first admission. Histpathologically, the recurrent tumor had higher cellularity and atipia, and had larger number of immunopositive cells for proliferate-cell nuclear antigen when compared to the original tumor. Based on these clinicopathological findings, the tumor was considered as histologically low-grade fibrosarcoma.

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