[Value of arthrography in hip dislocation during the 1st year of life].

Forty-four arthrograms were done in 41 infants less than one year old. The author has studied displacement of the femoral head and deformity of the acetabulum. The relationship of the femoral head to the limbus was specifically assessed. The antero-posterior orientation of the acetabulum was found to be normal. The sphericity of the acetabulum varied with the position of the hip. The maximum sphericity was found in 90 degrees flexion, 35 degrees abduction and neutral rotation. In this position the femoral head was better centered.