They look to see if the baby's hips can be subluxed or moved out of position. If subluxation is detected, further evaluation is needed. The femoral head sits in the acetabulum. The femoral head freely rotates within the acetabulum. This type of joint allows for many planes of motion.
Dysplasia is abnormal development of one part or both parts of the hip.
The severity of dysplasia will affect the hip in several ways that will be discussed later. Congenital Hip Dysplasia has a spectrum of risk factors and potential causes. On a genetic level, authors have shown that it may be due to an increase in a particular type of collagen, a building block of bone and cartilage. Several developmental risk factors exist. There is a higher incidence of CHD in first -born children.