title: Discrepancy between sonographic and radiographic values after ultrasound-monitored treatment of developmental dysplasia of the hip.
abstract: BACKGROUND
  The purpose of the study was to examine the accordance between the actually used sonographic and radiographic standard values after ultrasound-monitored treatment of developmental dysplasia of the hip (DDH).
  
  
  METHODS
  One hundred and fifty-three (119 children) ultrasound-monitored treated hips (initial staging according to Graf: type IIc-IV) which attained normal ultrasound findings (type I according to Graf) during treatment and underwent an anteroposterior radiograph of the pelvis at the time of starting walking (mean age 18.6 months) were evaluated retrospectively.
  
  
  RESULTS
  While all hips showed normal sonographic values (Graf type I), 26 (17%) showed mild and 17 (11.1%) severe dysplasia (by measuring the acetabular index) according to the radiographic Toennis classification system, and 29 (19%) showed mild and 48 (31.4%) severe dysplasia according to the Wiberg centre-edge angle.
  
  
  CONCLUSIONS
  This data show that the actually used sonographic and radiographic standard values concerning DDH do not correlate appropriately. It must be put up for discussion whether the radiographic standard values might be too strict. Further criteria must be developed to better assess the prognosis of residual dysplasia.
authors.affiliation: Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Munich, Germany.
authors.forename: Sandra
authors.initials: S
authors.lastname: Utzschneider
authors.affiliation: Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Munich, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Chita
authors.affiliation: Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Munich, Germany.
authors.forename: Alexander C
authors.initials: AC
authors.lastname: Paulus
authors.affiliation: Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Munich, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Guenther
authors.affiliation: Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Munich, Germany.
authors.forename: Volkmar
authors.initials: V
authors.lastname: Jansson
authors.affiliation: Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Munich, Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Heimkes
keywords: Graf; Toennis classification; acetabular index; developmental dysplasia of the hip; hip ultrasound