Table 3 Differences in median (interquartile range) postoperative gap and step-off on radiographs and CT scans between patients with a total hip arthroplasty (THA) and those who retained their native hip at follow-up.

From: The accuracy of gap and step-off measurements in acetabular fracture treatment

Measurements

Imaging modality

THA (N = 12)

Native hip (N = 47)

Gap

Radiographs

2.4 (0.0–3.9) mm

0.0 (0.0–3.4) mm

CT scans

6.0 (4.0–8.5) mma

5.0 (4.0–7.0) mma

Step-off

Radiographs

0.0 (0.0–0.0) mm

0.0 (0.0–0.0) mm

CT scans

4.0 (2.3–5.0) mma

2.0 (0.0–3.0) mma,b

  1. aSignificant difference between measurements on radiographs and CT scans, with a P-value < 0.05.
  2. bSignificant difference in the median step-off on CT scans, between patients with a THA and those who retained their native hip at follow-up.
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