Fig. 1From: Minimally invasive internal fixation for unstable pelvic ring fractures: a retrospective study of 27 casesMeasurement of pelvic deformity index (PDI) and pubic symphyseal width (PSW). a Preoperative AP film. b Postoperative AP film. X or Y is the diagonal length from the inferior SI joint (iliac side) to the inferior aspect of the teardrop on an AP film. PDI = absolute (X − Y)/(X + Y)Back to article page