A useful intraoperative technique for transiliac-transsacral screws: a point-to-point coaxial guide apparatus

Table 1 Statistic analysis of clinical indicators of the two groups

Variable	PTP (n = 20)	Free-hand (n = 18)	T/χ²	P value
Age (years)	47.2 ± 17.0	44.7 ± 13.4	0.483	0.632
Gender (women/men)	6/14	7/11	0.333	0.734
Follow-up in months	14.7 ± 2.2	13.8 ± 2.1	1.187	0.243
Cause of injury
Fall from height/ traffic accident	3/17	4/14	0.329	0.687
Pelvic fracture type (OTA/AO classification)
Type B/ type C	9/11	12/6	1.799	0.210
Screws level (6.5 mm)
S1 level/S2 level	9/11	11/7	0.986	0.352
Intraoperative data (mean ± SD)
Operation time (min)	25.8 ± 4.7	40.5 ± 5.1	− 9.160	< 0.001^a
Radiation exposure times (N)	24.4 ± 6.0	51.6 ± 8.4	− 11.489	< 0.001^a

ISSN: 1749-799X