
I am afraid it does sometimes happen, and it happened to a friends dobe bitch. It had travelled to her shoulder blade, and when playing it mudt have been hit and broke. This then caused an alergic reaction and an abscess, which needed draining, and a lot of scar tissue formed in ugly lumps. After a couple of months and some of it being removed by the bet her shoulder almost looks normal again.
I am not anti chipping, and have all four of mine chipped, but implanting any foreign body can cause a problem.