Spinal FusionIntervertebral Disc DegenerationLumbar VertebraeDiskectomyIntervertebral DiscInternal FixatorsCervical VertebraeTotal Disc ReplacementArthroplastySpondylosisIntervertebral Disc DisplacementSpinal DiseasesSpinal StenosisBone ScrewsDecompression, SurgicalSpondylolisthesisThoracic NervesProstheses and ImplantsZygapophyseal JointAutonomic Fibers, PreganglionicRange of Motion, ArticularBiomechanical PhenomenaThoracic VertebraeWeight-BearingTreatment Outcome