This happened to me about ten years ago. I had been working very long
hours and wasn't getting enough sleep. I was cutting 3/4" dadoes with
a dado blade and after a pass inadvertently let the board come back
into contact with the far side of the blade. The board kicked back so
fast I never even saw it. I knew I was hit, but wasn't sure where.
Checked my hands and said "oh sh*t". Very little blood, in fact over
the next three hours maybe only a dozen drops. Called into ER and told
them I'd had a tablesaw accident. Spent the afternoon there, listening
to the doctors argue over what to do. They were talking about
reconstructing tendons, ligaments, veins, etc. I finally spoke up and
told them I didn't think I was actually cut. but was just hit at the
joint very hard. One them said okay lets find out. He pulled the end
of the finger back on to the knuckle and it stayed (then there was
lots of blood). Four stitches and I was out the door, good as new.
Got back to the shop and found the piece I had been cutting had
impaled itself completely into 3/4" plywood sheathing behind me. I
knew I had been very lucky. Number one rule in my shop now is
"Do NOT use power tools when you are tired"