Lumbosacral RegionSpinal CanalSacrumLumbosacral PlexusSpinal CordSpinal StenosisLumbar VertebraeSpinal Cord CompressionSpinal Cord InjuriesSpinal Nerve RootsLaminectomySemicircular CanalsCervical VertebraeThoracic VertebraeSpinal DiseasesCauda EquinaSpinal Cord DiseasesRadiculopathyEar CanalSpinal NeoplasmsMyelographySpinal FusionLigamentum FlavumDecompression, SurgicalIntervertebral Disc DisplacementEpidural SpaceSpineSpinal FracturesSpondylolisthesisSpinal Cord NeoplasmsPolyradiculopathyRoot Canal PreparationSpondylosisMagnetic Resonance ImagingInjections, SpinalDura MaterLongitudinal LigamentsInternal FixatorsTomography, X-Ray Computed