During from January 1970 to March 1974, 3190 infants were born in the Obstetric Unit of National Kurume Hospital.
All newborn babies have been routinely examined by Ortolani's technique, and Barlow or Palmén's provocation test within the first week of life.
This test was positive in the 4 cases (male 0, female 4) were treated with Pavlik's band and Hanausek's apparatus.
The questionnairing was conducted on other infants.
In 1037 infants, 16 cases of acetabular dysplasia and 8 cases luxation (0.77%) were fonud.