Intervertebral Disc DegenerationIntervertebral DiscIntervertebral Disc DisplacementSpinal DiseasesLumbar VertebraeFibrocartilageSpinal OsteophytosisAggrecansCollagen Type IIMagnetic Resonance ImagingProteoglycansDisease Models, AnimalSpinePyran CopolymerCervical VertebraeLumbosacral RegionLow Back PainCollagen Type IXWeight-BearingCompressive StrengthIntervertebral Disc ChemolysisSpinal FusionCells, CulturedNotochordThoracic VertebraeSpondylolisthesisSacrumRetinal DegenerationMacular DegenerationBiomechanical PhenomenaNerve DegenerationSpinal StenosisScoliosisChymopapainLordosisDiscitisCadaverBack PainGlycosaminoglycansLaminectomyExtracellular Matrix ProteinsGene Expression ProfilingOligonucleotide Array Sequence AnalysisDiskectomyRadiculopathySciatica