Patient demographic data were captured. Intraoperative data were recorded including operative time, estimated blood loss, fluoroscopic exposure time, and duration of hospital stay. Patient reported outcomes visual analog scale (VAS) back and leg pain, Oswestry Disability Index (ODI) and a satisfaction and work status survey were collected preoperatively and at each follow-up. Surgeon reported outcomes Odom’s criteria, and radiographic determinations were recorded at each follow-up. Mechanical stability of the SIJ was defined as absence of screw loosening and radiolucent gaps at the bone-screw interface, screw migration, and improvement in patient symptoms by 12 months postoperatively. Radiolucency was assessed using the criteria in Table 1, and these scores were used to inform decisions on mechanical stability.

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