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Table 3 Comparison of preoperative plan vs postoperative actual measurements and pre- vs postoperative actual measurements based on X-ray radiography and CT 3-dimensional reconstruction data

From: Patient-specific instrument-assisted minimally invasive internal fixation of calcaneal fracture for rapid and accurate execution of a preoperative plan: A retrospective study

Mean Preoperative plan vs postoperative actual measurement Preoperative vs postoperative actual measurement
Preoperative plan Postoperative Δb Pa Preoperative Postoperative Δb Pa
X-ray Böhler angle (°) 31.5 ± 2.7 30.2 ± 5.9 5.7 ± 3.3 0.407 9.6 ± 6.5 30.2 ± 5.9 20.7 ± 7.0 0.000
Gissane angle (°) 125.6 ± 4.0 123.6 ± 4.4 5.0 ± 4.3 0.187 151.3 ± 8.0 123.6 ± 4.4 27.7 ± 7.7 0.000
CT 3-dimensional reconstruction Subtalar joint width (sustentaculum) (mm) 46.8 ± 1.3 46.4 ± 2.9 3.2 ± 2.0 0.718 55.4 ± 2.8 46.4 ± 2.9 9.0 ± 4.3 0.000
Calcaneus valgus angle (°) 3.6 ± 0.8 3.3 ± 1.3 1.4 ± 0.9 0.541 −0.1 ± 5.0 3.3 ± 1.3 4.6 ± 1.9 0.010
Calcaneal volume overlap ratio with preoperative design: 91.2 ± 2.3%  
  1. aPaired-samples t test
  2. bDifference in absolute value