Spinal DiseasesSpinal CordSpinal Cord InjuriesSpinal NeoplasmsIntervertebral Disc DegenerationSpondylitis, AnkylosingLumbar VertebraeSpasmH-ReflexHipReflex, AbnormalMotor NeuronsLocomotionElectromyographyTibial NerveReflexFootMovementMuscle, SkeletalNeurons, AfferentInjections, SpinalElectric StimulationSpinal NervesSpinal Cord DiseasesAnesthesia, SpinalRecovery of FunctionSpinal Nerve RootsSpinal Cord NeoplasmsSpinal CanalBiomechanical PhenomenaImmunohistochemistrySpinal Cord CompressionTime FactorsSpinal StenosisSpinal Fusion