I have seen a headline about "multiple bones" but the text of the article I read with that headline only specifically mentioned the hyoid bone. The article stated that that bone is more commonly fractured in cases of strangulation than in cases of suiccide by hanging. I have no idea if this is true, but the hyoid bone is small and fairly easily fractured. I'm pretty sure that the only other bones in the neck would be the seven cervical vertebrae. Now, in my amateur opinion, fractures or dislocations in the cervical spine would be unlikely to happen in a jail cell suicide by hanging ind therefore very suspicious, but I have seen nothing, other than vague references to "multiple bones" to suggest that such fractures or dislocations actually happened.