Within the framework of this joint research project, a minimally invasive, patient-specific surgical technique is being developed for a malformation of the hip joint in children. The aim is to correct a deviation in the shape of the femoral neck bone that is responsible for the deformity and to achieve a natural alignment of the hip joint. of the hip joint is achieved. The angular correction is to be fixed precisely and minimally invasively with an implant adapted to the bone geometry of the child and using X-ray-transparent targeting instrumentation.