3D angle: angle between the mechanical axes before and after derotation.

Corrections of the lower limb anatomy—varus derotation osteotomy or better: varus detorsion osteotomy —are therefore gaining increasing importance in the therapeutic repertoire (2, 3).

For example, an orthopedic surgeon performed femoral varization derotational osteotomy for coxa valga and increased femoral anteversion. The surgeon planned to adduct the distal fragment 45 ...