Developmental dysplasia of the hip (DDH) or Hip dysplasia is a condition which is seen in infants and young children as a result of developmental problems in the hip joint. The femur (thigh bone) partially or completely slips out of the hip socket causing dislocation at the hip joint. It is most common in first born babies with a family history of the disorder. The exact cause for hip dysplasia is not known. DDH can be mild or severe and can affect one or both hips. It is more common in girls and usually affects the left hip. DDH does not cause any pain and so the condition may not be noticed until the child starts to walk.
In a normal hip, the head of the femur (thigh bone) fits well into the socket (acetabulum) whereas in hip dysplasia, the socket and femoral head are not congruent because of their abnormal development. During the adult life, patients with CDH, have a higher chances of developing arthritis and require hip replacement surgery. Depending on the severity of the case, hip replacement surgery can be straightforward or more complex. In extreme cases, custom-made hip replacement need to be manufactured for the patient.