Origin of Congenital Dislocation of the Hip.
—The importance of the upright position that man has assumed is pointed out by Krukenberg1 as a fundamental difference between man and the lower animals. In the upright position the hips are developed in a position of extension, which position is a critical one from the standpoint of dislocation as the flexors of the hip are developed in a position of tension. Krukenberg has experimented on three dogs soon after birth, placing their limbs in the extended position that is assumed by man standing upright. In both female animals the hips were dislocated, while the male animal showed no change.
Spontaneous Healing of Congenital Dislocation of Hip.
—Kopits2 reports three cases of spontaneous reduction of congenital dislocation of the hip and believes that they occur much more frequently than is generally believed. He realizes the danger of proclaiming this