You have to admire the determination of those who have to work through something like losing a finger to work out how they can still play.

I came close to cutting off my left index finger when I was 20. I was careless with a table saw and it sliced into the back of the finger. The outcome was a scar, a split nail and I can't quite straighten the end joint. Luckily this doesn't seem to have had too much effect on my guitar playing (for better or worse).