Some effects of position on the roentgenographic diagnosis of dislocation at the infant hip

Abstract

X-ray findings in the examination of the hips in infants depend upon the position of the infant during the examination. Each of three variables of position, (1) pelvic tilt, (2) abduction of the femurs, and (3) external rotation of the femurs, affects the apparent relation but not the real relation between the acetabulum and the femur.