To evaluate the usefulness of dynamic ultrasound assessment for the diagnosis of DDH and for Pavlik harness treatment monitoring.

Dynamic ultrasound examination was performed on 35 infants (average age: 3 months) having possible hip dysplasia. Based on ultrasonographic findings (normal, laxity with stress, subluxated, dislocated), the indication and duration of Pavlik harness treatment was determined. Radiographic examinations were performed at regular intervals (after 6 months) to assess hip development.

All hips showing normal ultrasonographic findings developed well. In 20 infants treated with the Pavlik harness, 2 infants failed to maintain the harness application, 16 infants among 18 were successfully weaned from the harness, and 2 infants required additional treatment. Of the 16 successfully treated patients, 3 showed hip dysplasia, and one showed mild avascular necrosis of the femoral head.

Dynamic ultrasound monitoring is an effective method for the accurate diagnosis of various degrees of hip dysplasia, the assessment of reduction quality, and for the assessment of hip stability during Pavlik harness treatment, and provides a reliable guide during the weaning from the harness process.