The correlation between radiographic and surface topography assessments in three plane pelvic parameters

Noninvasive rasterstereography has been reported as a helpful tool for assessing pelvic parameters. However, the validation and reproducibility of this tool are still questionable.

To investigate the correlation between video rasterstereography device (VRD) and X-ray photography in terms of validity and reproducibility (inter- and intra-examiner reliability) in pelvic parameters.

Thirty male and female healthy subjects with a mean age (26.9 ± 4.9 years) participated in this study. Subjects were examined by VRD for three pelvic parameters (pelvic torsion, pelvic tilt, and pelvic inclination). Measurements were conducted by three different examiners. Subjects were examined by X-ray radiography for the same pelvic parameters as well. Pearson correlation coefficient (r) was used to examine the validity and Intra-class correlation coefficient (ICC) was used to check intra- and inter-examiner reliability.

For pelvic torsion, tilt, and inclination the validity levels of VRD were 0.867, 0.996, and 0.930 (P < 0.05), respectively; while the intra- and inter-examiner reliability coefficients were 0.999, 0.999, and 0.998 and 0.990, 0.997, and 0.989, respectively.

The results of this study revealed that the VRD has both high validity and reliability in assessing the selected three pelvic parameters that reflect the three fundamental planes of movement in healthy subjects. Further studies using VRD are recommended to assess low back pain-associated pelvic parameters.