OSTEOGENESIS IMPERFECTAThe natural history of developmental dysplasia of the hip: sonographic findings in infants of 1–3 months of ageRoovers, Elisabeth A.a; Boere-Boonekamp, Magda M.a; Mostert, Adriaan K.b; Castelein, René M.c; Zielhuis, Gerhard A.d; Kerkhoff, Toon H.M.aAuthor Information aCentre for Health Care Research, University of Twente, Enschede bDepartment of Orthopaedic Surgery, Isala Clinics, Location Weezenlanden, Zwolle cDepartment of Orthopaedics, University Medical Centre Utrecht, Utrecht dDepartment of Epidemiology and Biostatistics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands Sponsorship: This project was funded by the Netherlands Organisation for Health Research and Development (ZonMw). Correspondence and requests for reprints to M.M. Boere-Boonekamp, MD, PhD, Centre for Health Care Research, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. Tel: +31 53 4894483; fax: +31 53 4894734; e-mail: [email protected] Journal of Pediatric Orthopaedics B: September 2005 - Volume 14 - Issue 5 - p 325-330 Buy Abstract The natural history of sonographic developmental dysplasia of the hip was determined in a population-based study in which 5170 infants were screened by ultrasound using Graf's method. Of the normal hips at the age of 1 month, 99.6% were still normal at the age of 3 months. Of the immature type IIa/IIa+ and type IIa− hips, if untreated, 95.3 and 84.4% had become normal, respectively. Of the infants with type IIc, D and III/IV hips at the age of 1 month 70, 58.3 and 90.9% were treated, respectively. This study shows that normal hips remain normal in nearly 100% of cases, but development to abnormality is possible. It shows also that most of the immature hips at the age of 1 month become normal without treatment. Although treatment seems to be indicated in the majority of sonographically abnormal hips, the occurrence of overtreatment could not be excluded in our study. © 2005 Lippincott Williams & Wilkins, Inc.