Racehorse Injuries (IMAGE) Johns Hopkins Medicine Caption Johns Hopkins Medicine researchers recently compared the third metacarpal, or cannon bone, from three different breeds of horses (Thoroughbred, American Quarter Horse and feral Assateague Island ponies) to better understand how it responds to mechanical stresses, like those experienced during racing. Credit Graphic by M.E. Newman, Johns Hopkins Medicine, using public domain images for the horse leg and bone, and a racehorse photo courtesy of M.J. Boswell Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.