“Functional Retroversion” of the Femoral Head in Legg-Calvé-Perthes Disease and Epiphyseal Dysplasia: Analysis of Head-Neck Deformity and Its Effect on Limb Position Using Three-Dimensional Computed Tomograp

3DCT analysis reveals that femoral head deformity in LCPD causes functional retroversion and functional coxa vara, explaining the externally rotated gait and contradicting previous reports of increased anteversion.