Certainly there are many reports of people with various types of chronic pain getting relief from one or more infusions of ketamine.

CNN: Is it safe to use ketamine as a pain drug?

Researchers at Sydney's National ICT Australia (NICTA) have spent the past two years developing an incredibly futuristic invention which could bring relief to those who suffer from chronic pain.

ENGADGET: Chip implanted in spinal cord could help sufferers of chronic pain (video)