Surgical Treatment for Posterior Dislocation of Hip Combined with Acetabular Fractures Using Preoperative Virtual Simulation and Three-Dimensional Printing Model-Assisted Precontoured Plate Fixation Techniques

Table 3

Clinical characteristics and outcomes.

	Traditional method	3D printing method	P value
	Group 1 (n=9)	Group 2 (n=7)
Software simulation time (min), M±SD	- -	11.14±1.07	n/a
3D printing time (min), M±SD	- -	608.43±27.54	n/a
Plate pre-contouring time (min), M±SD	- -	46.86±17.69	n/a
Operation time (min), M±SD	254.44±34.46	211.71±52.23	0.069
Instrumentation time (min), M±SD	71.78±9.69	38.43±10.81	<0.001
Blood loss (ml), M±SD	742.22±228.68	735.71±614.22	0.977
Postoperative X-ray film, n (%)			0.475
< 2 mm displacement	7 (77.8)	7 (100)
> 2 mm displacement	2 (22.2)	0 (0)
Complication, n (%)
No	4 (44.4)	5 (71.4)
Yes	5 (55.6)	2 (28.6)
AVN of the femoral head	1	2
Heterotopic ossification	1	0
Superior gluteal artery injury	0	1
Post-traumatic arthritis	3	0

AVN, avascular necrosis; M±SD, mean ± standard deviation; n, patient number; n/a, not applicable.
Independent t test or chi-square test.
Fisher’s exact test.
The same patient sustained superior gluteal artery injury and AVN of the femoral head.