Sorry for not replying sooner, I did read your post but wasnt able to write back at the time
aww doestn sound nice the op, however, remember that because he is so little he will never remember it

Presume he has metal work to hold it in place?
Regarding teh social services, they have to get them involved routinely in this situation. Just think, if a child was getting abused and they didnt enquire you dont want to think about teh outcome.
Although you dont want to have the social services on your case etc, they are jsut doing there job. You are innocent so you dont need to worry.
Im not sure what your current situation is with social services, but Im guessing that they will just be keeping an eye open for anyother signs of abuse. As as I believe you that you are innocent they should find no answers.