Longitudinal LigamentsOssification of Posterior Longitudinal LigamentOssification, HeterotopicLigamentsCervical VertebraeDecompression, SurgicalLigamentum FlavumSpinal Cord CompressionLaminectomySpinal Cord DiseasesSpondylosisHyperostosis, Diffuse Idiopathic SkeletalSpinal FusionSpinal OsteophytosisSpinal StenosisLigaments, ArticularSpinal DiseasesIntervertebral Disc DisplacementThoracic VertebraeIntervertebral DiscDecompressionSpineQuadriplegiaDecompression SicknessRadiculopathyTuberculosis, SpinalPeriodontal LigamentLumbar VertebraeTomography, X-Ray ComputedTreatment OutcomeMagnetic Resonance ImagingDiskectomyPosterior Cruciate LigamentKyphosisInternal FixatorsPatellar LigamentRetrospective Studies