Anybody out there on methadone for pain management due to herniated disks?

My son has herniated and bulged disks due to automobile accident. He became addicted to narcotic medication that was given to control his pain. Went through detox but doctor wants him to go to methadone clinic to manage his pain. He completed detox 3 weeks ago and has had no narcotic pain pills since, but today started on the methadone program. I am having a hard time understanding this, can anyone give me insight from personal experience?

: http://alcoholdrugstreatment.info/anybody-out-there-on-methadone-for-pain-management-due-to-herniated-disks