I once read an interview with a trauma surgeon. He was talking about pneumatic nailers. He said the only difference between how he removed nails and how you remove them is that his Vise-grips are sterilized.
someone should have spent the extra dollar for the longer arrow.
that entrance is right where the bone to your thumb meets the wrist joint.
he hopefully got lucky and the arrow glanced off that joint and it's all fat and flesh.
if not there is a line of tendons right in that area too and is where your grip strength comes from.
A whole bunch of important feeler circuits that go right through there probably got severed too. Likely to have some gimpy fingers and atrophy later on.
Might be close enough to the palm or underside of the 1st carpal/metacarpal/Trapezium that maybe it slid under or just glanced off bone.
When I shattered the 1st metacarpal, Trapezium, Trapezoid and Scaphoid in my left wrist, just a little forward of the entrance of that arrow is where they drilled one of the stainless pins in to hold everything together after they re-positioned all the pieces of bone.
it definitely had to be a field point.
if it were a broad head we would have got cooler pictures.
I wonder if I could lift that pic for future 'I need a day off work' use.
I don't see it sticking out the off side of the hand. It looks to be a carbon arrow, it could have snapped off on release. Young engineer friend of mine informed me carbon fiber gets brittle with age.
When I zoom in on the pic I can see the exit out in the palm. My guess would be that is a bolt, not an arrow.
Many people loose their thumb or have other issues with crossbow operation. My father just about lost half his thumb with one. Tore it open real bad. I made him some tard guards so it wouldn't happen again. Very common for folks to have safety incidents with them.