Frequency of and risk factors associated with catastrophic musculoskeletal injuries in Quarter Horses at two Midwestern racetracks: 67 cases (2000-2011).

Objective: To determine the incidence and anatomic location of and potential risk factors for catastrophic musculoskeletal injuries (CMIs) in racing Quarter Horses.

Design: Retrospective matched case-control study.

Animals: 67 racing Quarter Horse racehorses euthanized because of CMIs and 134 matched controls.