Spinal OsteophytosisSpondylosisCervical VertebraeSpinal Cord CompressionLaminectomySpinal Cord DiseasesDecompression, SurgicalSpinal CanalDiskectomyMyelographyLordosisOssification of Posterior Longitudinal LigamentSpinal FusionElectrodiagnosisRadiculopathyLongitudinal LigamentsKyphosisSpinal StenosisEvoked Potentials, SomatosensoryTreatment OutcomeRecovery of FunctionMagnetic Resonance ImagingSpinal CordCicatrixAthetosisAdenomatous Polyposis Coli ProteinPostoperative ComplicationsFollow-Up StudiesGlial Fibrillary Acidic ProteinRetrospective StudiesParaparesis, Tropical SpasticSpondylolysisSpondylitis