This monograph presents a comprehensive discussion of all aspects of congenital hip dislocation, and constitutes valuable reading for both pediatrician and orthopedic surgeon. The author is well qualified to write such a book; he was associated with Lorenz for many years in Vienna, and was his successor at the Orthopedic University Clinic there.
Hass classifies congenital dislocation of the hip in 3 categories: (1) Typical, in which hip dysplasia is present at or before birth and is followed in some cases by dislocation after weight-bearing begins.