Spinal Nerve RootsEpidural SpaceSpinal NervesEpidural NeoplasmsSpinal CordSpinal Cord CompressionPeripheral Nervous System NeoplasmsNerve Compression SyndromesPulsed Radiofrequency TreatmentLumbosacral RegionQuipazineElectric Stimulation TherapyRadiculopathyLumbar VertebraeSpinal Cord InjuriesInjections, SpinalNeuralgiaMagnetic Resonance ImagingSciatic NerveGanglia, SpinalPeripheral Nerve InjuriesSciaticaLigationPeripheral NervesHyperalgesiaSpinal CanalLumbosacral PlexusSpinal Cord NeoplasmsSpinal StenosisSpinal Cord DiseasesPeripheral Nervous System DiseasesCauda EquinaNerve FibersIntervertebral Disc DisplacementSpinal DiseasesNerve BlockCervical VertebraeRats, Sprague-DawleyAnesthesia, SpinalSpinal NeoplasmsPainSpinal FusionPain MeasurementMyelographySacrumLaminectomyMotor NeuronsPain ThresholdNerve RegenerationPosterior Horn CellsOptic NerveSpineCervical PlexusNeurons, AfferentAxonsRhizotomyThoracic VertebraePhysical StimulationMononeuropathiesLow Back PainAxotomyAnalgesicsHyperesthesiaDecompression, Surgical