Novel Pedicle Screws Used for Corrective Surgery in Spinal Deformity

adult patients with severe spinal deformity who underwent PSO osteotomy and posterior spinal corrective surgery with traditional double rods (No dual-headed screw used)

adult patients with severe spinal deformity who underwent PSO osteotomy and posterior spinal corrective surgery with three rods (one dual-headed screw used in unilateral side)

adult patients with severe spinal deformity who underwent PSO osteotomy and posterior spinal corrective surgery with four rods (two dual-headed screw used in bilateral side)