Fig. 3

Secondary coronal angular deformity after temporary epiphysiodesis. a Anteroposterior long standing radiograph of a 10-year-old girl with predicted idiopathic leg length discrepancy (LLD) of 3 cm. b After temporary epiphysiodesis around the right knee using RigidTacksTM (Merete, Berlin, Germany) showing neutral coronal alignment of the treated right leg. c After 16 months of treatment showing significant secondary femoral varus deformity of the right leg. d After conversion to a distal femoral hemiepiphysiodesis through implant removal on the concave side of the deformity and change to a flexible staple (FlexTackTM, Merete, Berlin, Germany). e After another 6 months of treatment showing restoration of the neutral coronal alignment of the right leg and complete LLD equalisation