CordotomySpinal CordSpinal Cord InjuriesElectric StimulationElectric Stimulation TherapyInjections, SpinalSpinal NervesSpinal Nerve RootsSpinal Cord DiseasesAnesthesia, SpinalPhysical StimulationSpinal Cord NeoplasmsSpinal CanalStimulation, ChemicalSpinal DiseasesSpinal Cord CompressionSpinal NeoplasmsDeep Brain StimulationSpinal StenosisSpinal Fusion