Objective To investigate the pelvic symmetry of complex three-dimensional form based on reverse engineering,and explore whether the healthy side of pelvis can serve as a reference model for the affected side.Methods Computed to-mography scan images of each of 50 Chinese pelvises were converted to 3D models and the left sides of the pelvises were re-flected on Mimics software.Then,the reflected left side model was aligned with the right side using the 3D deviation analysis function of Geomagic Qualify software to perform symmetry analysis.The volume and surface area of either side of the pelvises were also calculated.In addition,the distribution of pelvic bilateral symmetry associated with both age and sex were compared.Results The mean standard deviation was(1.11±0.13)mm and the mean percentage of permissible deviations was(91.96± 3.13)％.There was no significant difference between the bilateral sides of the pelvis in either volume or surface area(P＞0.05).Additionally,no difference in any indexes was exhibited in relation to sex and age distribution(P＞0.05).The deviation color maps showed that the specific areas of asymmetry were primarily localized to major ligament or muscle attachment sites and the sacroiliac joint surfaces.Conclusion Our results demonstrated that the pelvis has high bilateral symmetry,which means that the healthy side of pelvis can serve as a reference model for the affected side,and provide a theoretical basis for the research based on the pelvic symmetry.
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