This Tuesday, about 11am EST US, I 3/4 amputated the distal 5/8" of my left thumb by slipping on a table saw! Owee!
It sawed completely through the bone. The hand surgeon said that was actually a good thing. Had it shattered, it would have required surgery. As it is, it MAY heal. Sensation will probably not return. They really don't know the outcome, yet. That tip may have to come off. It just depends upon whether or not the severed portion re-vascularizes. (irk!) So far, it looks 'favorable'.
Be careful, guys!
Lloyd