Spinal Cord DiseasesIntervertebral Disc DegenerationIntervertebral DiscIntervertebral Disc DisplacementLumbar VertebraeSpinal CordSpinal FusionMuscular Atrophy, SpinalDiskectomySpinal DiseasesSMN Complex ProteinsSpinal Cord InjuriesTotal Disc ReplacementFibrocartilageProsthesis ImplantationProstheses and ImplantsSurvival of Motor Neuron 1 ProteinInternal FixatorsCervical VertebraeIridoid GlycosidesSpondylolisthesisLow Back PainSpondylosisArthroplastySacrumEating DisordersMood DisordersDiagnostic and Statistical Manual of Mental DisordersRibonucleoproteins, Small NuclearPersonality DisordersSpinal StenosisAnxiety DisordersBack PainMotor NeuronsMental DisordersAggrecansMagnetic Resonance ImagingBone ScrewsTreatment Outcome