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Table 1 Demographic and surgery details

From: A novel patient-specific three-dimensional-printed external template to guide iliosacral screw insertion: a retrospective study

  Template group (n = 22) Conventional group (n = 18) P value
Sex Male 11, Female 11 Male 10, Female 8 0.726*
Age (years) 51.7 ± 15.2 50.1 ± 13.7 0.728#
Time from injury-to-surgery (days) 5.4 ± 2.0 4.1 ± 2.0 0.049#
AO/OTA classification of sacrum    0.723**
 54B 7 4  
 54C 15 14  
Posterior pelvic ring disruption, n (%)    1.000**
 SI dislocation 3 (13.6%) 2 (11.1%)  
 Denis zone I fracture 8 (36.4%) 7 (38.9%)  
 Denis zone II fracture 11 (50.0%) 9 (50.0%)  
Number of screws    0.954*
 S1 20 16  
 S2 18 14  
Operation time (min)    < 0.001#
 S1 18.7 ± 4.3 39.8 ± 10.6  
 S2 17.1 ± 4.7 39.6 ± 11.1  
 Average 17.9 ± 4.5 39.7 ± 10.7  
Radiation exposure (cGy/cm2)    < 0.001#
 S1 755.2 ± 239.5 1852.1 ± 844.5  
 S2 729.1 ± 226.5 1963.3 ± 872.3  
 Average 742.8 ± 230.6 1904.0 ± 844.5  
  1. P value < 0.05 considered statistically significant
  2. *Pearson chi-squared test
  3. **Fisher’s exact test
  4. # Two independent samples Student’s t-test
  5. SI sacroiliac joint
  6. Values are presented as the mean ± standard deviation, unless otherwise indicated