There are definitely varying degrees of fractures. I'm sure when they say Jermaine was playing with a "fractured" wrist, they are talking about a chip or a very, very minor one.
When I fractured my wrist, I couldn't move my whole left arm. There is no way you could play basketball, unless you just played with one arm.
I agree it shows some toughness from O'Neal. But I saw him do a lot of things with his arm that are physically impossible when you have a fractured wrist.