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Evaluation of Surgical Removal of Fractured Distal Splint Bones in the Horse
Authors:K F BOWMAN DVM  MS  L H EVANS DVM  MOLLIE E HERRING BS
Institution:Section of Large Animal Surgery, George D. Widener Hospital for Large Animals at New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania
Abstract:Between January 1977 and June 1980, 38 Standardbred and 23 Thoroughbred horses had fractured distal splint bones removed surgically. Standardbred horses were treated significantly more frequently compared with the hospital population. The incidence of distal splint bone fractures in the front legs was significantly greater (p 0.05) than in the rear legs in both breeds. Associated suspensory desmitis was present in 81% of Standardbred and 67% of Thoroughbred horses at the time of surgery.
The most common radiographic sign was fracture with associated callus. It was not possible to correlate preoperative radiographic signs with presence of associated suspensory desmitis. One Thoroughbred horse developed a large mass of amorphous bone at the surgical site which required a second surgical procedure.
Follow-up information was available on 21 of 38 Standardbred and 17 of 23 Thoroughbred horses. There was no correlation found between preoperative radiographic signs or the location and number of distal splint bone fractures with postoperative results. Twenty-five percent of Standardbreds that had preoperative suspensory desmitis eventually reached at least their previous level of performance. None of the Thoroughbred racehorses with preoperative suspensory desmitis returned to their previous level of performance. Five of 17 Thoroughbred horses were pleasure horses, and all were reported "sound for intended use" following surgery; however, only four of five were used at their previous level of performance.
The significant feature in the prognosis of distal splint bone fractures in this series was the presence of associated suspensory desmitis. Postsurgical performance was limited by the recurrence of suspensory desmitis.
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