Ligamentum FlavumOssification, HeterotopicLigamentsLongitudinal LigamentsOssification of Posterior Longitudinal LigamentLaminectomySpinal Cord CompressionSpinal StenosisLigaments, ArticularThoracic VertebraeSpinal DiseasesCervical VertebraeEpidural SpaceRadiculopathyLumbar VertebraeBrevibacteriumDecompression, SurgicalHematomaBrevibacterium flavumElastic TissueSpinal CanalIntervertebral DiscLumbosacral RegionSpinal Cord DiseasesMyelographyCystsPeriodontal LigamentSpineThalictrumAnesthesia, Epidural