title: A novel method for assessing postoperative femoral head reduction in developmental dysplasia of the hip.
abstract: OBJECTIVE
  Developmental dysplasia of the hip (DDH) affects approximately 1 % of live births. Dislocated hips require reduction and stabilisation in a spica cast, and reduction efficacy is assessed radiologically. Numerous measurements are used to ascertain the adequacy of reduction but can be inconsistent in evaluating femoral head position. This study describes the morphology of the developing acetabulum in DDH and validates a novel method to assess adequate reduction of the dysplastic hip following closed or open reduction.
  
  
  METHODS
  A retrospective review was performed of 66 consecutive patients undergoing reduction of hip dislocation over a 2-year period. Three independent reviewers evaluated postoperative CT scans to assess anterior-posterior (AP) displacement and modified Shenton's line. Acetabular morphology was also assessed along with hip congruency using a described novel 'posterior neck line'.
  
  
  RESULTS
  Dislocated hips were successfully identified using the posterior neck line with a sensitivity of 0.71 and specificity of 0.88 giving a negative predictive value of 0.97. The interobserver reliability of this technique was higher in comparison against both (AP) displacement and modified Shenton's line.
  
  
  CONCLUSIONS
  We have shown a novel approach in assessing the acetabular morphology of DDH and a novel technique to accurately confirm the reduction of dislocated hips following open or closed reduction.
authors.affiliation: Department of Orthopaedics, Sheffield Children's Hospital, Western Bank, Sheffield, S10 2TH, UK.
authors.forename: Anthony
authors.initials: A
authors.lastname: Cooper
authors.forename: Owain
authors.initials: O
authors.lastname: Evans
authors.forename: Farhan
authors.initials: F
authors.lastname: Ali
authors.forename: Mark
authors.initials: M
authors.lastname: Flowers