Ouch. That’s not a common break, IME, but either an outstretched arm or direct trauma can cause it. I’ve mildly separated both shoulders a few times over the

Ouch. That’s not a common break, IME, but either an outstretched arm or direct trauma can cause it. I’ve mildly separated both shoulders a few times over the years. Thankfully no major separations or breaks - just some MRIs and PT (plus a few concussions). I did break my forearm when I was 5 - fell jumping a fence, reached out, and snap. Classic broken arm.