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Table 1 Descriptive statistics: mean value ± standard deviation [min−/max-values]

From: “Simple mechanical devices did not improve pelvis positioning in AP pelvis radiographs for reliable assessment of the acetabular orientation”

  Positioning I Positioning II Positioning III CT
Vertical distance symphysis-sacrococcygeal joint (in mm) 40.1 ± 18.5 [12.6–70.7] 35.3 ± 19.6 [11–73.8] 36.8 ± 22.2 [3.6–71.1] 25.4 ± 13.9 [8.3–46.1]
Horizontal distance symphysis-midpoint sacrococcygeal joint (in mm) 4.8 ± 3 [0–10.4] 4.1 ± 3.1 [0–10.4] 5.3 ± 4.1 [0–13.5] 3.8 ± 1.4 [1.7–6.1]
Vertical distance symphysis-tip of the coccyx (in mm) 13.5 ± 16.1 [− 16.2–33.3] 11.9 ± 15 [− 12.6–33.8] 8.2 ± 19.1 [− 23.4–34.2] 1 ± 16.3 [− 29.2–20.5]
Vertical distance symphysis-lower end of the sacroiliac joint (in mm) 83.9 ± 19.1 [63–123.3] 80.7 ± 15.9 [63.9–117] 79.2 ± 17.4 [59.4–98.6] 68.1 ± 15.7 [49.8–100.8]
Ratio vertical/horizontal diameter pelvic foramen 0.6 ± 0.1 [0.48–0.92] 0.6 ± 0.1 [0.45–0.75] 0.6 ± 0.1 [0.46–0.75] 0.5 ± 0.1 [0.4–0.72]
Ratio vertical/horizontal diameter obturator foramen right 1.0 ± 0.2 [0.54–1.41] 1.0 ± 0.2 [0.69–1.31] 1.0 ± 0.2 [0.74–1.49] 1.2 ± 0.1 [0.96–1.39]
Ratio vertical/horizontal diameter obturator foramen left 1.1 ± 0.3 [0.71–1.56] 1.1 ± 0.2 [0.84–1.36] 1.1 ± 0.2 [0.78–1.63] 1.2 ± 0.2 [0.77–1.54]