Outcome of arthroscopic debridement for the treatment of incomplete third carpal bone slab fractures in racehorses.

Abstract

Objective: To describe the outcomes of arthroscopic debridement of third carpal bone (C3) incomplete slab fractures (ISF) in racehorses.

Study design: Retrospective case study.

Sample population: Horses undergoing arthroscopic debridement of ISF of C3.

Methods: The medical records of horses surgically treated for ISF of C3 were reviewed. Age, sex, breed, limb, fracture configuration, preoperative radiographs, arthroscopic findings, postoperative intraarticular therapies, and exercise recommendations were recorded. Racing performance was obtained from online databases. Univariable analyses were used to determine associations between independent variables and outcomes.

Results: A total of 33 horses fit the criteria. There were 19 Thoroughbreds and 14 Standardbreds. The postoperative racing rate was 66.7% (22/33 horses). There was no statistically significant difference in outcome between dorsal and sagittal fractures or breeds. There were no significant differences in earnings per start or total earnings before and after surgery. Several horses showed an increase in racing frequency and an increase in earnings post-injury. Most horses, 81.8% (27/33), had at least one career start prior to undergoing surgery. The median convalescent period was 247.1 days.

Conclusion: Early diagnosis and subsequent arthroscopic debridement of C3 ISF was a viable treatment approach with a favorable prognosis for racing postoperatively.

Clinical significance: Early detection and arthroscopic debridement of ISF before progression to a complete slab fracture and/or subsequent osteoarthritis of the joint could improve athletic outcomes.