Fig. 1From: How to avoid unintended valgus alignment in distal femoral derotational osteotomy for treatment of femoral torsional malalignment - a concept studyPillar-Crane-Model frontal view; a virtual anatomical axis regardless of femoral bowing; b introducing “AMA at cutting”, which is needed for exact calculations; c when derotation of the proximal limb is performed, increase of AMA at cutting, and increase of mLDFA will occurBack to article page