Epidemiologic characteristics of catastrophic musculoskeletal injuries in Thoroughbred racehorses.

The research paper explores the prevalence, specific characteristics, and potential correlating factors of serious musculoskeletal injuries in Thoroughbred racing horses. This study specifically looks at data from two racetracks in Ontario during 2004 and 2005, providing essential insight for future injury prevention strategies.

Methods

• The researchers investigated 76 Thoroughbreds who experienced catastrophic musculoskeletal injuries (CMIs) either during racing or training sessions in the specified time frame.
• The incidence rates of CMIs were calculated using the number of CMIs as the numerator and the total number of races or training events in 2004 and 2005 as the denominators. These numbers establish the relative frequency of these injuries.
• Further calculations provided exact 95% confidence intervals, which offer a range within which the true population parameter will fall 95% of the time.
• The researchers also explored potential associations between CMIs and various factors, including dichotomous exposure (either present or absent), nominal (categories with no specific order), and ordinal factors (ordered categories). The focus was on univariable associations, meaning they considered each factor separately.

Results

• The study found that 76 horses had to be euthanized due to CMIs, representing 2.36 and 1.69 deaths per 1,000 racing starts in 2004 and 2005 respectively.
• Of these, 57 horses were euthanized within 60 days before or after a race, yielding an incidence rate of 1.05 deaths per 1,000 racing starts and 0.39 deaths per 1,000 training starts.

Conclusions

• The incidence rate of CMIs at the two Ontario racetracks was found to be consistent with those at other North American racetracks.
• This research suggests that a typical rate of 1 to 2 deaths per week could be expected, and this baseline should be taken into account when creating injury prevention strategies.
• By establishing this benchmark, improvements can be quantitatively measured overtime.