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Table 3 The accuracies of the leg length measurements in the present and previous studies

From: Accuracy of a portable accelerometer-based navigation system for cup placement and intraoperative leg length measurement in total hip arthroplasty: a cross-sectional study

  Method Correlation between intraoperative and radiographic leg length changes. The Pearson correlation coefficient and P value Accuracy of leg length measurement (mm)
Ranawat [36] Caliper 0.82, significant*
Rice [38] Caliper 0.275, P > 0.05 3.2 ± 8.0 (absolute value)
Enke [39] Caliper 0.259, not significant
Renkawitz [13, 14, 17] Imageless navigation (cadaver study) 0.83, P < 0.001* 0.74a
Imageless navigation (cadaver study) 0.92, P < 0.001* 0.50a
Imageless navigation 0.80, P < 0.001* 0.35a
Kitada [8] CT-based navigation 1.3 ± 4.1a
Ogawa [40] CT-based navigation 0.88, P < 0.001* 2.4 ± 1.7 (absolute value)
Caliper 0.89, P < 0.001* 2.1 ± 1.6 (absolute value)
Ecker, Murphy and Ecker [1, 12] CT-based navigation −0.5 ± 1.7a
This study Portable navigation 0.80, P = 0.000* 0.8 ± 3.4a
   2.3 ± 2.6 (absolute value)
  1. *Statistically significant
  2. aValues are not absolute values