Structural variations:

1. Coxa valga/varum (frontal plane).
2. Femoral head angle (transverse plane) – angle between femoral condyles and femoral neck (post image).
3. Shaft torsion in transverse plane.
4. Condyle levels (genu valga/varum)

The femoral neck normally has >12′ anteversion with 35′ being excessive.
Retroversion is considered <8′ anteversion.