LaminectomyDecompressive CraniectomyDecompression, SurgicalSpinal StenosisLigamentum FlavumSpinal Cord CompressionLumbar VertebraeSpondylolisthesisThoracic VertebraeCraniotomyIntracranial HypertensionDura MaterSpinal CanalCervical VertebraeNeurosurgical ProceduresGlasgow Coma ScaleTrephiningTreatment OutcomeCompartment SyndromesSpinal Cord DiseasesSpinal NeoplasmsSpinal FusionIntracranial PressureIntervertebral Disc DisplacementPostoperative ComplicationsEpidural SpaceBrain EdemaArachnoiditisSpondylosisLongitudinal LigamentsSpinal Cord NeoplasmsGlasgow Outcome ScaleCauda EquinaTomography, X-Ray ComputedMyelographyMagnetic Resonance ImagingSpinal OsteophytosisBrain InjuriesRetrospective StudiesHematoma, Subdural, AcuteLumbosacral RegionArnold-Chiari MalformationSpinal DiseasesCervical AtlasFailed Back Surgery SyndromeHematoma, Epidural, SpinalSpinal Nerve RootsHematoma, Epidural, CranialFollow-Up StudiesSacrumIntra-Abdominal HypertensionHematoma, SubduralOssification of Posterior Longitudinal LigamentSkullIntracranial ThrombosisCerebral InfarctionSubdural EffusionInfarction, Middle Cerebral ArteryRecovery of FunctionAbdomenSpineDiskectomySinus Thrombosis, IntracranialOssification, HeterotopicTorsion, MechanicalProspective StudiesParaparesisRadiculopathyInternal FixatorsTissue AdhesionsSyringomyelia