Racing performance in 75 Thoroughbreds after arthroscopic removal of Osteochondritis dissecans from the lateral femoral trochlear ridge before first race start in Korea (2015-2017).
Authors: Sohn Y, An S J, Forbes E, Kim B S, Jeon H S, Ryu S-H, Lee I
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary Osteochondritis dissecans (OCD) of the lateral femoral trochlear ridge represents a significant challenge in young Thoroughbred racehorses, yet evidence on post-surgical racing prospects remains limited. Researchers at Jeju Stud Farm retrospectively analysed 75 horses undergoing arthroscopic OCD removal between 2015 and 2017, comparing their medical records, radiographs, and subsequent racing performance against 257 genetically matched control siblings. Encouragingly, surgery did not compromise overall career metrics: surgical horses achieved comparable registration and race-start rates, with no significant differences in earnings, race points, sale prices, or retirement age, although they did debut later and completed fewer total races. Lesion size and surgical timing proved largely inconsequential to performance outcomes, with the notable exception that horses operated on at older ages showed shortened racing careers. Sex emerged as the strongest prognostic factor, with males substantially outperforming females in both career longevity and earnings; particularly concerning were females treated before 12 months of age or those with large lesions (≥40 mm), which showed significantly earlier retirement and fewer race starts. These findings suggest that early arthroscopic intervention offers a viable option for managing stifle OCD without compromising long-term athletic potential, though closer monitoring and potentially modified management strategies may be warranted for young fillies and those presenting with substantial lesion burden.
Read the full abstract on PubMed
Practical Takeaways
- •Arthroscopic removal of lateral trochlear ridge OCD lesions before first race start is compatible with normal racing careers and does not compromise long-term performance or earnings in Thoroughbreds.
- •Sex-based factors appear more influential than lesion size or surgical timing on post-operative outcomes; exercise caution with early treatment in young females and those with large lesions, as they show reduced racing careers.
- •Delayed return to racing after surgery should be expected, but this does not translate to worse career earnings or longevity when the horse does race.
Key Findings
- •Arthroscopic OCD removal did not negatively affect overall racing performance metrics including sales prices, career earnings, race points, or retirement age in 75 Thoroughbreds (89.3% racehorse registration rate, 72.0% first race start rate).
- •Surgically treated horses had delayed first race start (p=0.000864) and fewer total races (p=0.01708) compared to 257 control siblings, but no significant difference in career earnings or longevity.
- •Lesion size and surgical timing had minimal impact on racing outcomes overall, except older age at surgery reduced career duration.
- •Female horses treated before 12 months of age and those with large lesions (≥40 mm) showed significantly poorer outcomes including fewer race starts and earlier retirement; males consistently outperformed females in career duration and earnings.