Intervertebral Disc DegenerationIntervertebral DiscIntervertebral Disc DisplacementSpinal DiseasesLumbar VertebraeFibrocartilageSpinal OsteophytosisAggrecansMagnetic Resonance ImagingCollagen Type IIDiskectomyProteoglycansDisease Models, AnimalHerniaCervical VertebraeSpineLumbosacral RegionLow Back PainIntervertebral Disc ChemolysisSpinal FusionThoracic VertebraeSciaticaSacrumCollagen Type IXRadiculopathyEncephaloceleWeight-BearingSpondylolisthesisCompressive StrengthCells, CulturedSpinal StenosisNotochordChymopapainRetinal DegenerationLaminectomyMacular DegenerationBiomechanical PhenomenaNerve DegenerationBack PainScoliosisDiscitisMyelographyLordosisCadaverSpondylosisGlycosaminoglycansExtracellular Matrix ProteinsDecompression, SurgicalZygapophyseal Joint