Natural progress of infantile developmental dysplasia of hip

Objective To explore the natural progress of developmental dysplasia of hip (DDH) by observing the transformation of infantile DDH with growth.Methods A total of 1,472 outpatient cases undergoing DDH screening from June 2010 to August 2012 were reviewed.And they were continually examined by ultrasonography and physical examination.Results All cases were examined by ultrasonography and physical examination.Eleven cases,12 hips were Graf Ⅱc; 4 cases,4 hips Graf Ⅲ; 1 case,1 hip Graf Ⅳ.All 16 cases wore Pavlik harness immediately.And 173 hips were of Graf Ⅱ a and 85 ％ acquired stabilization spontaneously during clinical observations.Two cases 2 hips among 1,331 cases with Graf Ⅰ hip developed into Graf Ⅱ dysplasia during observations.Conclusions Graf Ⅱ a hip in 6 weeks after birth has the potential of stabilizing with development.And most cases may become spontaneously stable within 14 weeks.And active follow-ups with ultrasound examination are important for preventing DDH. Key words: Hip joint;  Ultrasonography;  Graf classification