Fig. 4

An 11-year-old girl had bilateral genu valgum with a mechanical lateral distal femoral angle (mLDFA) of 82.6° on the right and 80.4° on the left (a). Satisfactory alignments were achieved at 6.5 months after percutaneous hemiepiphysiodesis using transphyseal screws, and the alignment was well maintained 2 weeks after implant removal with a mLDFA of 87.5° on the right and 88° on the left (b). One year after implant removal, overcorrection of the distal femur was occurred with a mLDFA of 91° on the right and 89.5° on the left, and the mechanical axis deviation increased 22.8 mm and 15.2 mm, respectively (c)