Developmental dysplasia of the hip (DDH) is a condition seen in infants and young children. It is also called hip dysplasia. In a normal hip joint, the ball of the femur (thigh bone) fits snugly ...

In a newborn infant, most of the hip joint is cartilage, which is soft and may contribute to the laxity of the joint. During the baby’s first year, the cartilage is replaced by bone.