Radiographic configuration and healing of 121 fractures of the proximal phalanx in 120 Thoroughbred racehorses (2007-2011).

This research examines patterns in fractures of the proximal phalanx (first bone of the foot), a common long-bone fracture in Thoroughbred racehorses. The study analyses these fractures’ complexity, frequency, and healing progression in horses admitted to Newmarket Equine Hospital between 2007 and 2011.

Objective and Methodology:

• The research aimed to describe the configuration of parasagittal fractures of the proximal phalanx in these racehorses. It further wanted to report on the distribution of fractures among this horse group and document the radiological progression of fracture healing in cases treated by internal fixation.
• This study used a retrospective case series methodology. Specifically, it analysed case records and radiographs of Thoroughbred racehorses with the specified fractures admitted to the Newmarket Equine Hospital over a four-year period.

Results of the Study:

• The research identified 121 fractures in 120 Thoroughbred racehorses. The fractures were often more complex than was initially apparent immediately following the injury.
• Significantly, the study reported a seasonality of fractures in 2- and 3-year-old horses, but not in older horses. This type of age-specific timing has not been reported in previous research and sheds new light on when these injuries are most likely to occur.

Conclusions:

• The researchers concluded that proximal phalanx fractures may be more complex than previously recognized. This complexity isn’t often identifiable radiographically immediately post-injury.
• The study suggests that the observed seasonality of fractures in 2- and 3-year-old horses is likely due to the timing of the turf-racing season in the UK.
• This research contributes to the body of knowledge surrounding equine bone fractures, pointing to the need for careful analysis post-injury to determine fracture complexity.