Spinal Cord DiseasesIntervertebral Disc DegenerationIntervertebral DiscIntervertebral Disc DisplacementSpinal CordLumbar VertebraeSpinal FusionMuscular Atrophy, SpinalSpinal Cord InjuriesSpinal DiseasesDiskectomySMN Complex ProteinsSpinal StenosisTotal Disc ReplacementFibrocartilageProstheses and ImplantsProsthesis ImplantationInternal FixatorsSurvival of Motor Neuron 1 ProteinSpondylolisthesisCervical VertebraeLow Back PainSpondylosisIridoid GlycosidesArthroplastySacrumMotor NeuronsRibonucleoproteins, Small NuclearBack PainLumbosacral RegionPain MeasurementMagnetic Resonance ImagingBone ScrewsDisability EvaluationTreatment OutcomeLaminectomyAggrecansRange of Motion, ArticularSpinal Cord Compression