VertebroplastyFractures, CompressionPolymethyl MethacrylateSpinal FracturesBone CementsKyphoplastyFractures, SpontaneousThoracic VertebraeSpineExtravasation of Diagnostic and Therapeutic MaterialsOsteoporotic FracturesSpinal NeoplasmsOsteoporosisBack PainLumbar VertebraeFluoroscopySurgical Procedures, Minimally InvasiveMethylmethacrylateRadiology, InterventionalPain MeasurementOrthopedic ProceduresKyphosisInjections, SpinalRadiography, InterventionalSpinal CanalAxisSpinal DiseasesCementoplastyPolymethacrylic AcidsInjectionsPainTreatment OutcomeSpinal Cord CompressionEmbolism, FatRadiographyPlacebo EffectRetrospective StudiesTomography, X-Ray ComputedPostoperative ComplicationsForeign-Body MigrationPulmonary EmbolismFractures, ComminutedVirginiaMethylmethacrylatesSpinal InjuriesFollow-Up StudiesThermoluminescent DosimetryArthroplastyCalcium PhosphatesHemangiomaLaminectomyThermal ConductivityMagnetic Resonance ImagingFracture FixationSacrumAnesthesia, LocalPain ManagementMinnesota