• Aged 18 years or older.
• Probably diabetic neuropathy confirmed using the Toronto criteria in a "conservative manner", i.e. three out of three symptoms/signs of neuropathy must be present (sensory neuropathy symptoms, distal reduced sensibility, reduced ankle reflexes) 7.
• Definite or probable neuropathic pain for minimum the last 6 months
• Mean pain intensity at > 4 NRS the last week17.

Since we expect a large effect of the block it is not necessary to discontinue pain medication.

• Other causes of pain in the same area or other pain that cannot be distinguished from the neuropathic pain.
• Unable to understand and speak Danish.
• Non-cooperative.
• Warfarin or other medication that contraindicate regional anesthesia.
• Infection in the injection area.
• Allergy to lidocaine.
• Pregnancy or lactating (fertile women must to show negative pregnancy test or use anticonception).
• Severe psychiatric disease e.g. severe depression during the last 6 months.
• Alcohol or drug abuse.