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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]