Three-dimensional analysis of the proximal femur in patients with slipped capital femoral epiphysis based on computed tomography

A three-dimensional (3D) analysis based on computed tomography was performe d to study the 3D geometry of the proximal femur in cases of slipped capita l femoral epiphysis (SCFE). For this purpose, new interactive software was developed to analyze hip joint geometry using 3D models without pelvis tilt ing and projected errors, Twenty-two patients, 8 girls and 14 boys, with a total of 30 slipped capital femoral epiphyses, were reviewed. In the affect ed hips, we observed a reduced femoral anteversion of 7.0 degrees (vs. 12.7 degrees) and a reduced femoral shaft neck angle of 134.2 degrees (vs. 141. 0 degrees). In response to these results, we suggest that an SCFE is associ ated with reduced femoral anteversion and a reduced femoral shaft neck angl e.