hi..u have not mentioned the year of surgery..is this in 2012...if so then removal of plate so early will lead to non-union...but you are saying that your child is having intense pain....the cause of severe pain
must be worked out...must get consultation with your orthopaedic surgeon
....i doubt wether union of fracture
is complete or not...i hape ur son is not suffering from fever
...look out for that and have serial x-rays..wish you health.