In the story Sad Day at Santa Anita Raises Questions about Synthetic Track One Horse Euthanized, Another Won’t Race Againreporter Terry Miller of the Sierra Madre Weekly does a fine job educating its readers about the current debate revolving around the 'safer surfaces' movement in the Thoroughbred horse racing industry.  What is most impressive to this writer is the succinct, understandable and very useful definition of a sesamoid bone:

A sesamoid bone is a bone embedded within a tendon. They are found in locations where a tendon passes over a joint, such as the hand, knee, and foot and act to protect the tendon and to increase its mechanical effect.

Click the link to the full article to find out why sesamoid bones are in the news.