Heredity in Congenital Dislocation of the Hip.
—By the reproduction of a set of 10 family trees, Faber1 shows not only that true congenital dislocation of the hip (25 cases) occurs in these families but that dysplasia of the hip joint (73 cases), oblique acetabulum and subluxation are found three times as often as dislocation. This indicates that the taint is four times as strong as would be suspected if only dislocations were sought. Furthermore, parents with simple dysplasia may have children with true dislocation. While true dislocation in this series was much more frequent in the female (5 to 1) than in the male, if one includes the cases of dysplasia the ratio is 1.55 to 1. The father as well as the mother in an affected family may transmit dysplasia or true dislocation. Furthermore, it is probable that unaffected persons in such a family may