Document Detail

Hip displacement in spastic cerebral palsy: repeatability of radiologic measurement.
MedLine Citation:
PMID:  12198471     Owner:  NLM     Status:  MEDLINE    
Radiologic measures of migration percentage (MP) and acetabular index (AI) taken from plain radiographs of the pelvis are the most commonly used tools for determining hip displacement and management options in children with cerebral palsy and spastic hip disease. This study determined interrater and intrarater reliability of MP and AI on pelvic radiographs chosen to represent a wide range of age (11 months to 8 years 5 months), MP (0%-56%), and AI (9 degrees -33 degrees ). The study demonstrated that an experienced rater would be expected to measure MP on a single radiograph to within +/-5.8% of the true value and a change in MP between two radiographs taken at different times to within +/-8.3% of the true value. Similarly for AI, the measurement error for a typical rater would be within +/-2.6 degrees on a single reading and +/-3.7 degrees if recording change between two occasions. The authors believe that the results indicating true change are acceptable in clinical practice, provided treatment decisions are based on a series of radiographs taken at 6-month intervals, methods and training are standardized, and consistent raters are used.
Jennifer Parrott; Roslyn N Boyd; Fiona Dobson; Ann Lancaster; Sarah Love; Jenene Oates; Rory Wolfe; Gary R Nattrass; H Kerr Graham
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of pediatric orthopedics     Volume:  22     ISSN:  0271-6798     ISO Abbreviation:  J Pediatr Orthop     Publication Date:    2002 Sep-Oct
Date Detail:
Created Date:  2002-08-28     Completed Date:  2002-10-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8109053     Medline TA:  J Pediatr Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  660-7     Citation Subset:  IM    
Hugh Williamson Gait Laboratory and Murdoch Children's Research Institute, Royal Children's Hospital, Melbourne, Australia.
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MeSH Terms
Acetabulum / pathology,  radiography
Cerebral Palsy / pathology*,  radiography*
Child, Preschool
Hip Joint / pathology*,  radiography*
Muscle Spasticity
Reproducibility of Results

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