This study aims to investigate the imaging appearance of subclinical and/or clinical disease in the fetlocks of southeast Queensland Thoroughbred racing fatalities. We will compare the utility of advanced imaging modalities for the identification of pathologies within the fetlock region with particular focus on the identification of possible risk factors or prodromal changes indicative of fracture.  An in vitro study is planned, using limbs from Thoroughbreds that are euthanised during training or racing.  All four limbs of each horse will undergo a complete radiographic examination, low-field magnetic resonance imaging (MRI) and non-contrast and contrast computed tomography (CT) examination of the fetlock region followed by gross pathology and targeted histopathology. Any abnormalities identified will be compared between imaging modalities and correlated with the results of pathology examination.  

This study will result in better understanding of the occurrence and imaging appearance of clinical and subclinical disease in the fetlock region of our racehorse population, leading to earlier detection and improved formulation of recommendations for treatment and management. Screening of at-risk horses could potentially reduce the number of horses that progress to breakdown or injury related to the fetlock region while racing or training.