Abstract: Objective：To explore and compare the curative effect of Tshaped plate combined with reconstruction of plate elastic fixation and parallel double anatomical locking plate internal fixation on posterior acetabular wall fractures.Methods：A retrospective analysis of the clinical data of patients with acetabular posterior wall fractures and surgical treatments admitted from January 2013 to January 2019.A total of 31 patients were included.Among them,17 cases underwent elastic fixation with Tshaped steel plate combined with reconstruction,and 14 cases underwent internal fixation with parallel double anatomical locking plates.Modified pain visual analogue scale(VAS),Map score and Harris score were used to evaluate the clinical results,and the quality of fracture reduction was evaluated by the imaging modified Matta grading standard.Results：31 patients successfully completed the operation.The operation time[(123.06±18.38)min] and intraoperative blood loss[(184.12±55.12)ml] of patients with combined steel plates were significantly less than those of patients with parallel steel plates[(139.29±22.61)min,(230.71±43.58)ml],and the differences were statistically significant(P<0.05).The pain in both groups was gradually reduced and the function improved.The parallel steel plate group's complete weight bearing time in parallel steel plates group[(13.71±1.31)w] was better than that of the combined steel plate group[(15.50±2.10)w],and the difference was statistically significant(P<0.05).With the passage of time after surgery,the VAS scores of the two groups were significantly reduced[(3.06±0.75，2.29±0.69，1.24±0.44)vs(3.71±1.07，2.50±0.65，1.36±0.50)],while the Harris score[(59.71±4.75，81.94±8.74，91.82±3.17)vs(57.14±8.47，79.71±7.21，90.57±5.30)] and the Map scores[(8.29±1.31，14.53±1.59，17.53±1.23)vs(7.79±0.80,13.71±1.64,16.57±1.55)] were significantly increased.At the same time point,the VAS and Map scores of the combined steel plate group were better than those of the parallel steel plate group,and there was no statistical difference(P> 0.05).Conclusion：Tshaped plate elastic fixation combined with reconstruction plate and parallel double acetabular anatomical locking plate fixation of posterior acetabular wall fractures have achieved good results in terms of stability and hip function recovery.However,the operation time using the combined steel plate method is shorter and the postoperative recovery is better.

Key words: fracture of the posterior wall of the acetabulum, anatomical locking plate, elastic fixation