I'm not expert, but I can't find anything on google about a wrist "microfracture". You can get a microfracture injury through repetitive trauma, but this was a (alleged) single impact injury.
There is also something called "microfracture surgery" which is to repair cartilage.
I'm going to speculate that they can't say it's a "fracture" because it's not; instead, they've come up with the term "microfracture" to suggest "its small, but may take our guy out for the next game or more, but don't be surprised when he starts game 2"
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