SciaticaBed RestHead-Down TiltWeightlessness SimulationIntervertebral Disc DisplacementWeightlessness CountermeasuresRestRadiculopathyCardiovascular DeconditioningSpace FlightBedsPiriformis Muscle SyndromeLumbar VertebraeInjections, EpiduralDiskectomyWeightlessnessLow Back PainChymopapainOrthostatic IntoleranceSpinal Nerve RootsNerve Compression SyndromesLower Body Negative PressureIntervertebral Disc ChemolysisPain MeasurementIntervertebral DiscLumbosacral PlexusPolyradiculopathyPhysiciansFibrocartilageMedical Staff, HospitalCauda EquinaTime FactorsSpinal CanalPeripheral Nervous System Neoplasms