Neuropathic Pain Study With Botulinum Toxin A in Spinal Cord Injury Patients

Inclusion Criteria: * more than twenty years of age * paraplegic or tetraplegic due to cervical and thoracic spinal cord injury * more than 12 months since spinal cord injury and ASIA impairment scale unchanged for more than 6 months * persistence of neuropathic pain for more than three months or remission and recurrence of neuropathic pain for more than six months * a pain score of 40mm or more on the visual analogue scale Exclusion Criteria: * neuropathic pain caused by confounding factors other than spinal cord injury * contraindicated for botulinum toxin type A * a change in pain medication one month prior to study enrollment * a condition involving neuromuscular junction (Ex. Eaton Lambert disease, myasthenia gravis) * person who received botulinum toxin type A within three months prior to study enrollment