Coxa vara adolescentium is a distinct entity. It consists of a disturbance of the nutrition of the epiphyseal line of the upper end of the femur. It results in various degrees of coxa vara if it is not properly treated. The deformity is due to weight-bearing in heavy children, which causes a displacement of the head through the giving-way of the poorly functioning epiphyseal line. The poor functioning is probably due to some endocrine disturbance and not to rickets or trauma. If the condition is taken early, reduction of the displacement can be obtained, and if this reduction is maintained long enough, complete anatomic restoration and perfect function are possible.