Fractures, CompressionKyphoplastyVertebroplastySpinal FracturesOsteoporotic FracturesPolymethyl MethacrylateBone CementsOsteoporosisFractures, SpontaneousSpineThoracic VertebraeKyphosisLumbar VertebraeBack PainOrthopedic ProceduresSpinal InjuriesSpinal NeoplasmsPain MeasurementTreatment OutcomePainFractures, BoneSurgical Procedures, Minimally InvasiveFracture Fixation, InternalSpinal Cord CompressionTissue Expansion DevicesFracture HealingHip FracturesBone DensityFemoral FracturesPain, PostoperativeRetrospective StudiesMagnetic Resonance ImagingFracture FixationFractures, ComminutedProspective StudiesPostoperative ComplicationsFollow-Up StudiesOsteoporosis, PostmenopausalRecovery of Function