| A0 = arcsin (- cos (A1) * cos (I1) * sin (α) + sin (A1) * cos (α)) | (13) |
| I0 = arcot (cot (I1) * cos (α) + sin (α) * tan (A1) / sin (I1)) | (14) |
AP = pelvic tilt; when converting the anteversion from the anterior pelvic plane to the coronal plane, I0 and A0 are the inclination and anteversion on the coronal plane; I1 and A1 are the inclination and anteversion on the anterior pelvic plane; the α is positive for the anterior pelvic tilt and negative for the posterior pelvic tilt; when converting anteversion from the coronal plane to the anterior pelvic plane, I0 and A0 are the inclination and anteversion on the anterior pelvic plane; I1 and A1 are the inclination and anteversion on the coronal plane; the α is negative for the anterior pelvic tilt and positive for the posterior pelvic tilt.