Signalment: 2-year old purebred Shorthorn bull; Primary complaint: Right pelvic limb lameness; History: The bull presented with a Grade IV/V right pelvic limb lameness that had progressed in severity over the course of several months. The client first noted sporadic lameness of the right pelvic limb five months prior, during the late winter. The bull had been put in a pasture with several cows during periods of ice and snow. The client presumed that the bull had experienced trauma due to the unstable footing, while attempting to breed one of the cows. Over the next two months, the lameness did not resolve and continued to worsen. The primary veterinarian performed a conventional lameness examination and took radiographs of the right stifle joint. At that time radiographs failed to identify any evidence of abnormalities. The owner was told that there was probable anterior cruciate ligament disease of the right stifle joint. The bull was given a poor prognosis for future breeding.