Neurostimulation for Treatment of Chronic Upper Limb Pain After Brachial Plexus Injury

Inclusion Criteria:

* Age \> 18 years old
* Neuropathic pain of the upper limb ≥ 3 months following brachial plexus avulsion injury.
* Patients must be planned to undergo implantation of high-frequency spinal cord stimulation for the treatment of chronic neuropathic pain due to brachial plexus avulsion injury.

Exclusion Criteria:

* Pain that is non-neuropathic as defined by DN4 score \<4.
* Pregnant at the time of consideration for implant or planning to become pregnant during the study duration.
* Active substance use disorder of any kind.
* Active tobacco use.
* Use of moderate or high dose opioid medication (oral morphine equivalents \>100 mg daily).
* Active, untreated major psychiatric disorder that might interfere with subject's ability to participate.
* Involvement in active litigation related to injury.
* Patient has not undergone conservative medical management for at least 3 months (including physical and/or occupational therapy and at least one trial of neuropathic pain medication).