Clinical findings and prognosis of interference injuries to the palmar aspect of the forelimbs in Standardbred racehorses: A study on 74 cases.

This study was conducted to explore the effects of palmar forelimb interference injuries on Standardbred racehorses. The findings reveal that these injuries commonly lead to a condition known as superficial digital flexor (SDF) tendonitis, which extends the animals’ recovery period. However, such tendonitis caused by interference injuries has a better prognosis compared to that resulting from overstrain.

Methods

• The study was done retrospectively, utilizing records from 74 racehorses that experienced palmar forelimb interference injuries. The number of race starts prior to the injury, hind shoeing status, gait penalties, and racing speeds were some of the data considered in this investigation.
• For comparative purposes, control data were drawn from 67 horses of equivalent age, sex, and speed category from the same races. The number of race starts and speed in the 30 days before recruitment were set against those following recruitment or return to racing.
• The research also examined clinical aspects and outcomes linked with interference-induced SDF tendonitis compared with 77 horses with overstrain-induced SDF tendonitis.

Results

• Among the 74 cases, SDF tendonitis was identified in 89% of the injured horses. These horses with SDF tendonitis took longer to return to racing, approximately six months, compared to horses without tendonitis, which typically took a month.
• Factors such as penalties for abnormal or unnatural movement (gait penalties) and the absence of horseshoes on the hind feet increased the risk of interference injuries.
• The horses with interference injuries participated in fewer races, measured at an average of 24 starts a racing day compared to the controls, which averaged 49 starts daily.
• In terms of prognosis, interference-induced SDF tendonitis cases required less recovery time than overstrain-induced tendonitis cases.

Conclusion

• The study was based on retrospective data, and the exact time at which the ultrasonographic assessments were conducted varied. Additionally, the health status of the control group remains unknown.
• Importantly, palmar forelimb interference injuries in Standardbred racehorses can often lead to SDF tendonitis, which typically lengthens the recovery period before the horses can return to racing.
• However, horses with interference-induced SDF tendonitis recovered quicker than those with overstrain-induced tendonitis, indicating a better prognosis for the former group of injuries.