Peripheral Nerve Block in Patients With Painful Diabetic Polyneuropathy

Inclusion Criteria: * 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. Exclusion Criteria: * 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.