Proximal or distal femoral osteotomy
The common osteotomy is the distal femoral osteotomy, in the femur bone just above the knee. The other kind of osteotomies may be that of the neck of the femur for torsional deformity or of the shaft for badly-healed fractures that need de-rotation or re-alignment.
Femoral Derotation Osteotomy in Adults for Version Abnormalities. Buly RL, Sosa BR, Poultsides LA, Caldwell E and Rozbruch SR. J Am Acad Orthop Surg. 2018 Oct 1; 26(19): e416–e425.