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• n  any of several small round bones formed in a tendon where it passes over a joint

• Stymie, still the world's top moneywinning horse ($911,335), was rapturously applauded as he went to the paddock for his first race since he was retired with a cracked sesamoid .
• X rays showed breaks in both sesamoid bones on his ankle.
• The cheering faded as the afflicted horse pounded on, then slowed to a stop with the fragile sesamoid bones above the hoof completely shattered.

• sesamoid bone
• os sesamoideum

News & Articles

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• All News
  Aubby K, winner of the Grade 1 Humana Distaff at Churchill Downs during the spring, has been retired after fracturing a sesamoid while pulling up after a routine workout here on Monday.
  Aug. 1, 2013 - Daily Racing Form

Quotes

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• Nick Zito in Kentucky.com
  It's at the back of the ankle, and it pulled away from the sesamoid,said Zito. "It's very small."
• D Wayne Lukas in USA Today
  I think he'll stay with me for a while,Lukas said. "He will not run again. I think he'll have a stud career. With sesamoid injuries, you can bring back a $25,000 claimer on Wednesday, but not this level of horse."
• Kiaran McLaughlin in BloodHorse
  He broke his sesamoid and fractured his pastern,McLaughlin said by phone. "He was in very bad shape and there was nothing that could be done. It was just one of those things where he took a bad step after galloping out." "It's very...