Thank you for your query.
I understand your anxiety
and your child's situation.Your child is already 12 years old.
If your child complains of pain then go for the surgery.It is better to do the surgery before his bones stop growing.
Consult an expert who specializes in this field.
Hope this answers your query.
If you have any other queries kindly direct them to me.
Wishing a speedy recovery.
Have a nice day.