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SILVIA

Primary Endpoints: Radiographic Proportion of subjects with S2AI screw loosening or other adverse findings on 2-year CT scans (see protocol for details) Clinical Proportion of subjects who develop new onset SIJ pain Change in SIJ pain in subjects with SIJ pain preoperatively (see protocol for details) Secondary Endpoints: Clinical Proportion of subjects requiring revision of S2AI screws Proportion of subjects who require therapeutic injection or other non-medicine-based intervention to treat SIJ pain (For further details, see protocol) Radiographic Incidence of S2AI screw breakage Incidence of S2AI screw loosening Incidence of abnormal bone reaction in the pelvis Change in sagittal alignment parameters (see protocol for details)

Primary Endpoints: Radiographic Proportion of subjects with S2AI screw loosening or other adverse findings on 2-year CT scans (see protocol for details) Clinical Proportion of subjects who develop new onset SIJ pain Change in SIJ pain in subjects with SIJ pain preoperatively (see protocol for details) Secondary Endpoints: Clinical Proportion of subjects requiring revision of S2AI screws Proportion of subjects who require therapeutic injection or other non-medicine-based intervention to treat SIJ pain (For further details, see protocol) Radiographic Incidence of S2AI screw breakage Incidence of S2AI screw loosening Incidence of abnormal bone reaction in the pelvis Change in sagittal alignment parameters (see protocol for details)