3D-CT is used for Measuring femoral neck anteversion in chil
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The importance of accurate femoral neck anteversion angle (FNA) measurement in the diagnosis and treatment of developmental dysplasia of the hip (DDH) in children cannot be overstated. The aim of this study was to verify the accuracy of the CT method using 3D printing technology and to assess its clinical utility.

Three observers assessed the FNA of 68 children with unilateral DDH using 2D and 3D-CT. Three months later, the operation was done again. The results of the above measurements were then compared to the 3D-printed femur (3D-PF) model's results. 3 observers used an electronic angle instrument to calculate the FNA in the 3D-PF model collectively.

Results:
--The primary measurement of FNA at the affected hips by 2D-CT was 44.0 ± 6.1, 49.5 ± 8.9, and 52.8 ± 7.9°, respectively.

--On the 3D-CT, it was 47.6 ± 5.4, 49.3 ± 6.8, and 48.6 ± 6.2°.

--Three months later, the FNA on 2D-CT was 49.3 ± 10.5, 42.8 ± 7.4, and 45.1 ± 9.3°, and it was 48.0 ± 6.5, 48.9 ± 7.2, and 49.0 ± 5.7° on 3D-CT, respectively.

--The FNA in the 3D-PF model at the affected and unaffected hips was 48.5 ± 6.6 and 36.9 ± 13.1°.

--There were significant differences between 2D-CT and 3D-PF measurements, but no significant difference was found between 3D-CT and 3D-PF measurements.

--The results by 2D-CT showed significant differences among groups and between the groups. However, the results by 3D-CT had no significant differences among groups or between the groups.

Finally, the findings of this study demonstrated that 3D-CT is a more accurate and repeatable approach for measuring FNA in DDH. In DDH children aged 3–8 years, the FNA at the affected hips is 11.6° greater than the unaffected hips.

Source: https://josr-online.biomedcentral.com/articles/10.1186/s13018-021-02400-x
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