The group of participants who have had a successful trial (>50% pain relief) during the trial phase

Spinal cord stimulation system (SCS) is an approved system to manage chronic intractable pain of the limbs and/or leg by delivering electrical stimulation using implantable leads and rechargeable implantable pulse generator (IPG) with 16 output channels. The IPG is implanted in a subcutaneous pocket and is capable of stimulating the spinal cord nerves when used with one or two 8-contact percutaneous or paddle leads.

Percentage of patients with a successful trial phase (responder rate) i.e. at least 50% reduction in patient-reported overall pain relief.

The average percentage of patient-reported pain relief at 3,6 and 12 months.

Leg pain will be assessed using a 10 cm Visual Analog Scale (VAS) with 0 indicating no pain and 10 indicating the worst pain. Following outcome measures will be derived from the VAS score on leg pain.

• Responder rate for leg pain i.e. percentage of patients who experience at least 50% reduction in leg pain compared to Baseline at 3, 6, and 12 months.
• Change from Baseline in mean leg pain at 3, 6, and 12 months
• Percentage change from Baseline in mean leg pain at 3, 6, and 12 months

Change from baseline in quality of life at 3, 6 and 12 months will be assessed using the EQ-5D-5L questionnaire.

Change from baseline in pain symptoms at 3, 6 and 12 months assessed by 11-point BPI-DPN (Brief Pain Inventory for Diabetic Peripheral Neuropathy) pain scale, with 0 indicating no pain and 10 indicating worst pain.

The patient's general health status at 3, 6 and 12 months will be assessed both by the patients themselves as well as the study investigators using the 7-point PGIC (Patient Global Impression of Change) and the CGIC (Clinician Global Impression of Change) instrument respectively. Responses for this questionnaire range from "no change (or condition has got worse)" to "a great deal better".

Patients' current work status (working for pay, working without pay, self-employed, out of work for more than 1 year, out of work for less than 1 year, homemaker/taking care of the house and/or family, student, retired, unable to work) will be collected at baseline and repeated at the 12 months follow up visit.