Spinal Cord Stimulator (SCS) is a therapy which masks pain signals before they reach the brain. It involves a small device, much like a pacemaker, that sends electrical pulses to the spinal cord in order to modify the pain signals. After the device is implanted, these pain signals are no longer perceived or they are replaced by a faint tingling feeling. SCS does not eliminate the source of pain as it simply changes the way the brain perceives the pain. SCS is used most commonly to treat CRPS (complex regional pain syndrome), neuropathic pain, and radicular pain in the arms or legs. This therapy can be used in those with a history of spine surgery or may be used to avoid spine surgery in the first place.