Incomplete longitudinal fractures of the proximopalmar aspect of the third metacarpal bone (Mclll) have been attributed to both acute trauma (Ross et al. 1988; Pinchbeck and Kriz 2001) or fatigue damage secondary to repetitive loading (referred to subsequently as repetitive stress-related bone injury) (Dyson 1988; Lloyd etal. 1988; Pleasant et al. 1992; Riggs 1994; Pinchbeck and Kriz 2001; Powell et al. 2010). The majority of reports have described small case series (Ross et al. 1988, n = 7; Lloyd etal. 1988, n = 10; Dyson 1988, n = 13; Riggs 1994, n = 1; Pinchbeck and Kriz 2001, n = 2) in which Thoroughbred and Standardbred racehorses have predominated (Ross et al. 1988; Dyson 1988; Pleasant etal. 1992), although fractures have also been identified in sports horses and general purpose riding horses (Lloyd ef al. 1988; Dyson 1988; Riggs 1994; Pinchbeck and Kriz 2001). The objectives were to document the signalment of horses, clinical features, response to diagnostic analgesia, diagnostic imaging findings and follow-up data in a large group of horses with an incomplete longitudinal fracture or stress-related bone injury of the proximopalmar medial aspect of the Mclll; and to compare the results between sports horses and racehorses.
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