Elbow, knees and palms are all lethal when they strike the right area.
I knocked a guy out with my elbow once.
I grabbed a rebound and came down and accidentally hit him in the head.
I ripped a guys arm of his socket once on a rebound. I was going up and he put his arm in my path and I was a tad bigger than say Bass at that point in my life muscle wise and it pulled his arm right out of his socket. It was a weird angle, I wanted the board badly and to be honest I was a little scared of his physicality as he was a big 240 guy and I am sure I was flushed with adrenaline. I felt bad about it as it was a pickup game but he told me years later that he got 30% disability from the VA and it pays his car insurance for life. They also moved him from a forward observer, dangerous job mind you, to an office job for the remainder of his service.
I am pretty sure that I have cracked ribs with an elbow strike before.
Look at the way he leans into it folks, he was trying to nail him not make space. Trust me, I was a hatchet man/goon at times when I played.