[What determines treatment results of the Frejka pillow treatment for congenital hip dislocation?].

The results of treatment of 1008 hips in 779 children were analyzed and their dependence on objective factors established. The major influence is attributed to the initial displacement of the femoral head; the greater it is the worse is the result. The age at the onset of treatment influences results only indirectly with displacement increasing in time. No other factor as sex, side involved (left, right or both), or family history seems to play a role.