Epidemiology of musculoskeletal injuries in a population of harness Standardbred racehorses in training

Abstract

BackgroundThere is a substantial paucity of studies concerning musculoskeletal injuries in harness Standardbred racehorses. Specifically, little is known about the epidemiology of exercise-related musculoskeletal injuries. Most studies on this subject involve Thoroughbred racehorses, whose biomechanics and racing speed differ from Standardbred, making comparisons difficult. Here, a population of Standardbred racehorses trained at the same racecourse was studied over four years and a classification system for exercise-related musculoskeletal injuries was designed. The incidence rates of musculoskeletal injuries causing horses’ withdrawal from training for 15 days or longer were investigated. A mixed-effects Poisson regression model was used to estimate musculoskeletal injury rates and to describe significance of selected risk factors for exercise-related injuries in this population.ResultsA total of 356 trotter racehorses from 10 different stables contributed 8961 months at risk of musculoskeletal injuries. Four-hundred-and-twenty-nine injuries were reported and classified into 16 categories, based on their aetiology and anatomical localisation. The overall exercise-related injury rate was 4.79 per 100 horse months. When considering risk factors one by one in separate univariable analyses, we obtained the following results: rates did not differ significantly between genders and classes of age, whereas one driver seemed to cause fewer injuries than the others. Racing speed and racing intensity, as well as recent medical history, seemed to be significant risk factors (p < 0.001), while being shod or unshod during racing was not. On the other hand, when pooling several risk factors in a multivariable approach, only racing intensity turned out to be significant (p < 0.001), since racing speed and the racing intensity were partially confounded, being strongly correlated to one another.ConclusionCharacterizing epidemiology of exercise-related musculoskeletal injuries in trotter racehorses provides baseline incidence rate values. Incidence rates of stress fracture are lower in Standardbreds compared to Thoroughbreds, whereas the opposite is true for tendon and suspensory ligament injuries. In addition to identification of risk factors for musculoskeletal injuries among Standardbred racehorses, results suggest that racing intensity seems to be a protective predictor of risk and recent medical history could be used to identify horses at risk of injury.

Pro-inflammatory cytokines and structural biomarkers are effective to categorize osteoarthritis phenotype and progression in Standardbred racehorses over five years of racing career

“…Horses enrolled in this study were part of a larger cohort of animals monitored from September 2008 to August 2013 and previously described [33]. Racehorses younger than 3-years old experiencing a spontaneous traumatic fetlock OA were assigned to the PTOA group at the moment of the lesion (T0).…”

Tendonitis of branches of the superficial digital flexor tendon in Standardbred racehorses: 15 cases

“…Sixty‐three were in the metacarpal region, 4 in the metatarsal region and 9 at the level of the pastern (Bertuglia et al . ). The cross‐sectional area of the SDFT is smallest in the mid‐metacarpal region and this has been suggested as a reason for susceptibility to injury (Riemersma and Schamhardt ).…”

Lameness caused by a chronic metatarsal haematoma secondary to repetitive interference injury in a Standardbred racehorse

“…; Bertuglia et al . ). Common diagnoses of MSI in SB horses include carpal and fetlock arthropathies (Vigre et al .…”

“…; Johnston and Nickels ), suspensory ligament desmitis and superficial digital flexor tendinopathies (Johnston and Nickels ; Bertuglia et al . ), and proximal palmar/plantar first phalanx fragments (Carmalt et al . ).…”