Abstract:[Objective] To evaluate the clinical outcome of a single ilioinguinal approach for open reduction and internal fixation (OR- IF) for acetabular double column and posterior wall fractures with the posterior wall fracture untreated. [Methods] From May 2016 to Janu- ary 2021, 30 patients, including 17 males and 13 females aged 22-76 years, received ORIF through a single ilioinguinal approach, involv- ing plate fixation of the anterior column and lag screw fixation of the posterior column, whereas the posterior wall fracture untreated for the acetabular double column and posterior wall fractures. The clinical and imaging results were evaluated. [Results] All the 30 patients were successfully operated on without serious complications, whereas achieved clinical fracture union with significant improvement in terms of the VAS score, hip extension ROM, hip internal and external rotation ROM, Harris score, and Merle-d 'Aubigne-Postel score at the latest follow-up compared with those at 3 months postoperatively (P<0.05) . Radiographically, all the patients got or maintained concentric hip alignment, satisfactory reduction of fracture, proper position of anterior and posterior column implants, with no protrusion of acetabulum. The Matta grade for fracture reduction and Tonnis scale for hip degeneration remained unchanged at the latest follow-up compared with those 3 months postoperatively (P>0.05) . [Conclusion] This single ilioinguinal approach for reduction and internal fixation with posterior wall fracture untreated achieves good clinical results for acetabular double column and posterior wall fractures