Intervertebral Disc DegenerationIntervertebral DiscIntervertebral Disc DisplacementSpinal DiseasesLumbar VertebraeFibrocartilageSpinal OsteophytosisAggrecansCollagen Type IIMagnetic Resonance ImagingProteoglycansDisease Models, AnimalSpineDiskectomyCervical VertebraeLumbosacral RegionLow Back PainCollagen Type IXWeight-BearingCompressive StrengthCells, CulturedIntervertebral Disc ChemolysisSpinal FusionNotochordThoracic VertebraeSpondylolisthesisSacrumRetinal DegenerationMacular DegenerationBiomechanical PhenomenaNerve DegenerationSpinal StenosisScoliosisChymopapainLordosisDiscitisCadaverGlycosaminoglycansBack PainExtracellular Matrix ProteinsLaminectomy