Ossification of Posterior Longitudinal LigamentLongitudinal LigamentsOssification, HeterotopicLigamentum FlavumCervical VertebraeHyperostosis, Diffuse Idiopathic SkeletalLaminectomyHabitsGrowth Differentiation FactorsLigamentsSpinal Cord DiseasesDecompression, SurgicalSpinal OsteophytosisSpinal DiseasesBone Morphogenetic Protein 2SpineSpinal FusionCore Binding Factor Alpha 1 SubunitAlkaline PhosphataseAsian Continental Ancestry GroupTomography, X-Ray ComputedPolymorphism, Single NucleotideChinaTreatment OutcomeGenetic Predisposition to DiseaseMagnetic Resonance Imaging