single break in my clavicle, it didn't heal....after a couple of months I'm told the broken ends have healed shut and are unlikely to fuse together. Had surgery at 4 months, they jab the healed ends of the bone, smear a little bone epoxy (removed from inside your hip bone) and then line up the pieces and screw it together with 7 dry wall screws and small metal plate. After a month I was back on the bike and it was good as new. Next time I will have the surgery ASAP.