When I was in the Boy Scouts we had a woodcraft card we had to carry. Anytime you had an accident with a knife or axe you would get a coener cut off the card. If you lost all four corners you were not allowed to handle a knife or an axe for six months. You my friend have lost a corner.
By the way, why was your leg postioned so that a ricocheting axe could hit it. This is some thing you should always consider.