Bone development is one of the most important parts of the growth. Delay in the onset of ossification in the femoral head is one of the important complications in growth, showing the possibility of various medical conditions in infants, as well as skeletal dysplasia or endocrine diseases. Normal femoral head ossification appears in radiographs of most 7-8 months age infants; while physiologically ossification of femur nucleus gets started at 4 months age, making the radiological studies useful after 7-8-month ages. While timely diagnosis of hip conditions in infants stand in a high priority to prevent growth retardations and developmental dysplasia of the hip (DDH); we used ultrasonographic studies to assess ossification center of the femoral head. delayed ossification of the femur head was diagnosed by ultrasonography in 162 infants, aged between 6 to 10 months in 2020 at Hawler teaching hospital and Helina center in Erbil. The diagnoses were confirmed by radiological study. Infants with confirmed DDH diagnosis were excluded. Our primarily result showed the possibility of ultrasonographic examination for detection of delayed ossification of the femur head and the ultrasonographic characteristics of these cases were discussed. So, in further studies it can be used to assess the hips of infants in lower ages. Ultrasonographic seems to be an efficient diagnostic method in examining bone at an early age and could be used as a powerful screening tools of hip in lower ages that radiography is not so useful like ultrasound.

Keywords: Femoral head, ossification center, Ultrasound and X-ray.