Abstract
1. The condition of persistent foetal alignment is discussed both as an entity and in its relationship to the development of a normal hip, and also to the varying degrees of congenital dislocation of the hip. A possible connection with osteoarthritis is also mentioned.
2. The secondary deformities to which it may give rise are discussed, and the way in which both primary and secondary deformities may be corrected is described.
3. The importance of estimating rotation with the hip in full extension is emphasised.
4. The results in eight patients so treated are mentioned.