Intervertebral Disc DisplacementIntervertebral DiscSciaticaDiskectomyLumbar VertebraeIntervertebral Disc ChemolysisMyelographyRadiculopathyDiskectomy, PercutaneousSpinal StenosisSpinal CanalSacrumDecompression, SurgicalSpinal Nerve RootsThoracic VertebraeLow Back PainSpinal FusionCervical VertebraeIntervertebral Disc DegenerationMagnetic Resonance ImagingTreatment Outcome