LaminectomyDecompression, SurgicalDecompressive CraniectomySpinal StenosisLigamentum FlavumSpinal Cord CompressionLumbar VertebraeSpondylolisthesisThoracic VertebraeCraniotomyDura MaterCervical VertebraeSpinal CanalSpinal Cord DiseasesIntracranial HypertensionSpinal NeoplasmsEpidural SpaceArachnoiditisIntervertebral Disc DisplacementSpinal FusionNeurosurgical ProceduresSpinal Cord NeoplasmsCauda EquinaMyelographySpinal OsteophytosisLumbosacral RegionGlasgow Coma ScaleTrephiningTreatment OutcomeCervical AtlasHematoma, Epidural, SpinalSpinal DiseasesCompartment SyndromesSpinal Nerve RootsLongitudinal LigamentsSpondylosisSacrumIntracranial PressureOssification of Posterior Longitudinal LigamentFailed Back Surgery SyndromeMagnetic Resonance ImagingPostoperative ComplicationsTorsion, MechanicalParaparesisOssification, HeterotopicBrain EdemaSpineArnold-Chiari MalformationDiskectomyRadiculopathySyringomyeliaTomography, X-Ray ComputedInternal FixatorsParaplegiaGlasgow Outcome ScaleEpidural AbscessTissue AdhesionsPolyradiculopathySpinal Cord InjuriesKyphosisBrain InjuriesSciaticaSpinal CordCadaverArachnoidHematoma, Subdural, AcuteBack Pain