[Medial and lateral shift of the femoral head epiphysis]

The authors demonstrate a developmental anomaly of the position of the epiphysis of the hip joint, i.e. its medial shift. They assumed that it will be a pre-arthrotic condition, as other known dysplasias of the hip joint. However, the position was reversed as if the shift of the epiphysis of the head of the femur in a medial direction protected the hip joint from the development of arthrotic changes. In case of a medial shift of the epiphysis of the head of the femur--caput varum prearthrosis is not involved.