Intervertebral DiscSpinal OsteophytosisCervical VertebraeIntervertebral Disc DisplacementIntervertebral Disc DegenerationSpinal DiseasesLumbar VertebraeFibrocartilageSpineIntervertebral Disc ChemolysisAggrecansDiskectomyCompressive StrengthLumbosacral RegionNotochordChymopapainWeight-BearingThoracic VertebraeDiscitisCollagen Type IIBiomechanical PhenomenaLow Back PainSciaticaSpinal FusionSacrumMyelographyProteoglycansRadiculopathyCollagen Type IXGlycosaminoglycansScoliosisDiskectomy, PercutaneousSpondylolisthesisSpinal StenosisMagnetic Resonance ImagingLaminectomyCadaver