Does periosteal scraping of the third metacarpal bone reduce the incidence of ‘bucked shins’ in young Thoroughbred racehorses?

This research investigates the effectiveness of a prophylactic technique, periosteal scraping of the third metacarpal bone (McIII), in reducing a horse leg condition known as bucked shins among juvenile Thoroughbred racehorses. From a study involving 170 Thoroughbred yearlings, it was found that this technique could reduce the incidence rate of bucked shins and allow for greater cumulative racing distances before this condition manifests—though it does not prevent the long-term occurrence of bucked shins.

Explanation of the Research

The research is centered around a common condition in racehorses known as bucked shins. Designed to explore the effects of an existing preventative measure, it studies periosteal scraping of the McIII in Thoroughbred racehorses.

• The research goal was to verify if periosteal scraping reduces bucked shins and enables increased cumulative race distances before the condition’s onset.
• Methodologically, it’s a nonrandomized clinical examination involving 170 Thoroughbred yearlings from one farm, all trained by the same trainer. Of these, 85 were treated with the scraping technique, while 85 served as control subjects.
• The study monitored these horses over 5 cumulative miles of racing (“breeze miles”) for signs of bucked shins.
• The incidence rate for bucked shins, as well as the cumulative breeze miles before the onset of the disease, were analyzed using incidence rates and Kaplan-Meier plots.

Results and Conclusions

The results presented evidence supporting the prophylactic effects of periosteal scraping:

• In the treated group, the incidence rate was 0.059 cases per breeze mile compared to 0.103 cases per breeze mile in the control group, indicating a lower incidence rate among the treated horses.
• Kaplan-Meier plots revealed a significant difference between the groups (P = 0.035), with treated horses able to breeze an average of 3.52 miles before disease onset as opposed to 2.50 miles for untreated horses (P = 0.005).
• Though the scraping procedure was found effective in reducing the incidence rate of bucked shins and aiding horses run longer distances before an incident, it failed in preventing the long-term occurrence of the disease.

The findings encourage further investigation into this widespread prophylactic technique, focusing on enhancing its long-term effectiveness.