Arm wrestling, like any sport, needs to be 'practiced'.....tendon strength and leverage are very important, as is technique......if the person (people) arm wrestling don't know what they are doing, and there is either no ref or one who doesn't know what they are doing, injuries of various degrees are common.....again, with the broken arms, people break their OWN arm by turning their head away, the shoulder follows the head and you move in 2 directions at once, literally breaking your own arm.......at high-level, well-run, arm wrestling competitions, injuries are very uncommon.......the year at the WSM contest where Nathan Jones suffered a spiral fracture ar mwrestling Magnus Samuelsson, 3 things happened....(1) Magnus is an experienced arm wrestler and knows what he is doing.....(2) Nathan didn't know how to to arm arestling, and he turned his head, and spiral fractured his own arm, (3) the ref didn't know rat shit from rice krispies when it came to arm wrestling and should have broken it up the second Nathan started turned his head.
**again** i am not making assumptions on what happened in the situation with the original poster, it is just that arm wrestling always gets a bad rap, and it isn't 'arm wrestling' that is dangerous, it is a combination of people arm wrestling who are not conditioned to do so and also not knowing what the hell they are doing, that is responsible for most of the injuries that do occur.