Intervertebral Disc DegenerationIntervertebral DiscIntervertebral Disc DisplacementSpinal DiseasesLumbar VertebraeFibrocartilageSpinal OsteophytosisAggrecansRegenerationCollagen Type IIMagnetic Resonance ImagingProteoglycansSpineDiskectomyCervical VertebraeIntervertebral Disc ChemolysisLumbosacral RegionCompressive StrengthWeight-BearingDisease Models, AnimalNotochordLow Back PainThoracic VertebraeCollagen Type IXSpinal FusionChymopapainSacrumBiomechanical PhenomenaSpondylolisthesisDiscitisCells, CulturedScoliosisSpinal StenosisGlycosaminoglycansSciaticaNerve RegenerationCadaverLaminectomyMyelographyExtracellular MatrixRadiculopathyBack PainLordosisExtracellular Matrix ProteinsLiver RegenerationRetinal DegenerationDiskectomy, PercutaneousMacular DegenerationChondrocytesStress, MechanicalNerve DegenerationRange of Motion, ArticularFinite Element AnalysisTotal Disc ReplacementZygapophyseal JointGrowth Differentiation Factor 5AgingSpondylosisSpondylolysisImmunohistochemistrySpinal CanalInternal FixatorsTissue EngineeringPolyradiculopathyRadiographyDecompression, SurgicalTailCartilageSpinal InjuriesBiglycanProcollagen N-EndopeptidaseProstheses and Implants