Comparison on efficacy of two internal fixations for posterior pelvic ring injuries

Abstract

Objective To compare the efficacy of minimally invasive adjustable plate (MIAP) and reconstruction plate in treatment of posterior pelvic ring injuries.Methods The study involved 36 patients with posterior pelvic ring injuries treated with open reduction and internal fixation in our hospital from October 2008 to September 2011.Sixteen patients were treated with MIAP (Group A),including 8 males and 8 females,at mean age of (40.2 ± 13.7) years and 20 were treated with reconstruction plate (Group B),including 9 males and 11 females,at mean age of (34.4 ± 10.0) years.Preoperative mean injury severity score (ISS) was 14.4 points (range,9-29) in Group A and 11.8 points (range,4-25) in Group B.According to AO classification,Group A had nine patients with type B and seven with type C injuries,and Group B had 14 patients with type B and six with type C injuries.Groups A and B had operation at (8.3 ± 5.1) days and (8.3 ± 3.8) days after injury respectively.The two internal fixations were compared in aspects of operation time,intraoperative fluoroscopy time,intraoperative blood loss,length of incision,fracture healing time and postoperative Majeed function score.Results All patients were available for follow-up of mean 23.4 months (range,1245 months).According to Majeed standard,Group A scored (85.6 ± 8.1) points,with excellence rate of 94％ and Group B scored (80.1-9.0) points,with excellence rate of 85％.Fracture malunion occurred in one patient and incision infection in one in Group B postoperatively.Conclusion MIAP has advantages of short operation time,small incision,little blood loss and strong fixation and is more effective than reconstruction plate in treatment of posterior pelvic ring injuries. Key words: Pelvis; Fracture fixation, internal; Minimally invasive adjustable plate