21. Following this race it was announced that High-Rise had fractured a sesamoid bone and would not race again. 22. It is inserted behind on the tuberosity of the calcaneus, the proximal phalanx and its related sesamoid bone . 23. Sometimes a sesamoid bone is fractured. 24. Fourth, there is often a small sesamoid bone in the tendon of origin of popliteus in many species. 25. The fractures in both sesamoid bones above the horse's right front ankle will end the 4-year-old's promising career. 26. Both heads become phalanx of the thumb; at the junction between the tendinous heads there is a sesamoid bone . 27. The colt had an enlarged sesamoid bone in his ankle, and some horsemen thought he would soon break down. 28. But we had it X-rayed, and we found that the sesamoid bone in his right hind leg was broken. 29. On-track veterinarians found open fractures to both sesamoid bones in his off-fore and determined he could not be saved. 30. Spears said an issue for Crenshaw will be how well he can push off the toe without the sesamoid bone .