Fig. 1

A Segmental anatomical axial deviation from the femora mechanical axis was measured for each of the three sections and intersegmental bending was calculated. Note that bending angles are not the mirrored angles of SAD. B Isthmic distance from the top of the intercondylar notch and isthmic width in the femoral intramedullary canal was measured. NSA neck–shaft angle, pSAD proximal segmental axial difference, PB proximal femoral bowing, mSAD middle segmental axial difference, GB gross femoral bowing, DB distal femoral bowing, dSAD distal segmental axial difference, mLDFA mechanical lateral distal femoral angle