Abstract
Which therapeutic position is better for the treatment of the congenital hip dislocation according to muscle power which influence on the torsion of the femoral neck?
We put the small Kirshner wire into the femoral neck after the osteotomy on the femoral neck of a rabbit. And then, the specific muscle power is given the Lorenz-position and another specific muscle spasm is exerted in the Lange-position. We image the hip treated by Plaster Paris when the Kirshner wire is put through the joint space, and can regard as the treatment by movable splint (for example Pavlikband), if the Kirshner wire is not stuck the joint space.
We get the following results:
1) Retrotorsion of the femoral neck is found in the Lorenz-position fixated by Plaster Paris, Slight retrotorsion is seen in the Lorenz-position by the splint.
2) In the Lange-position by Plaster Paris, the antetorsion increase. But, using the movable splint in this position the antetorsion decrease highly.
3) When we find the residual subluxation, we measure the antetorsion as increase, we should apply the Lange-position by movable splint, but if the femoral neck angle is normal, we should fix the hip in the Lange-position by Plaster Paris.
