(a) This shows a different patient’s X-rays. The valgus correction is maintained by placing blocking screws in the concavity of the deformity (lateral aspect). Peripheral blocking screws can be used as well. (b) The sagittal plane requires at least one blocking screw in the proximal fragment near the osteotomy (the screw shown at the entry site of the ILN is theoretical and is never used). (c) This lateral film shows a well-placed posterior blocking screw (arrow).