Surgical Treatment of Post-surgical Mastectomy Pain Utilizing the Regenerative Peripheral Nerve Interface

Inclusion Criteria: In order to be eligible to participate in this study, a subject must meet all of the following criteria: * Reporting post-mastectomy pain at least six months removed from mastectomy or partial mastectomy (lumpectomy). * Willing to comply with all study procedures and be available for the duration of the study * Fluent in English * Women of reproductive potential must use highly effective contraception (specify methods of contraception acceptable for the study, e.g., licensed hormonal methods) and/or willingness to undergo a pregnancy test. Exclusion Criteria: A potential subject who meets any of the following criteria will be excluded from participation in this study: * Previous surgical management for chronic post-mastectomy pain * Signs/symptoms which are not suggestive of neuropathic pain based on physical exam at time of consultation. * Pregnancy or lactation * Men will not be enrolled in this study due to the low prevalence of male mastectomy. * Anything that, in the opinion of the investigator, would place the subject at increased risk or preclude the subject's full compliance with or completion of the study.