Colts' GM Chris Ballard dismissed the idea that the os trigonum is the cause of Andrew Luck's nagging injury Tuesday, as claimed by Colts' owner Jim Irsay earlier in the week. Ballard said the ...

You probably have never heard of the Os Trigonum, and the odds you have one are slim. But Andrew Luck does have this extra little bone behind his left ankle, according to the Indianapolis Star, whi… ...

"The os trigonum is a separate bone in the back of the ankle. It’s there because it didn't join to the rest of the ankle joint during development,” Pfeffer said, noting that only 5 percent of ...

Let me give you some advice, do not take your Os Trigonum for granted. For the best part of 50 years I have lived in blissful ignorance of my Os Trigonum. Today it is dominating my life.