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Patient 9. a Pre-operative X = 141.8 Y = 158.7 with high left ramus fracture intra-articular. b Right SI screw closes SI joint. c Anterior column screw protects acetabulum. d Anterior internal fixator distracts left sacral fracture and fixed with fully threaded SI screw, X = 157.4, Y = 165.0, DI 0.0235
