Surgical InstrumentsSteelSterilizationHistory, 16th CenturyEquipment ContaminationDecontaminationDisinfectionStainless SteelSpinal CordAsepsisHistory, 17th CenturySurgery, Computer-AssistedLaparoscopesEquipment DesignCreutzfeldt-Jakob SyndromeMicrosurgerySpinal Cord InjuriesPrionsSurgical Procedures, Minimally InvasiveInjections, SpinalDental InstrumentsSpinal NervesSpinal Cord DiseasesAnesthesia, SpinalSpinal Nerve RootsSpinal Cord NeoplasmsSpinal CanalSpinal DiseasesSpinal Cord CompressionSpinal NeoplasmsSpinal StenosisSpinal FusionReproducibility of ResultsPsychometrics