How to judge pelvic malposition when assessing acetabular index in children? Three simple parameters can determine acceptability.

Yang Y , Porter D , Zhao L , Zhao X , Yang X , Chen S
Journal of orthopaedic surgery and research
The acetabular index (AI) is the most commonly used parameter for diagnosing hip dysplasia. Pelvic malposition can result in misinterpretation of AI measurement especially in younger children. We aimed to investigate the correlation between pelvic orientation and acetabular index (AI) by using digital reconstructed radiographs (DRRs) and identify reliable parameters predictive of pelvic orientation on plain radiographs.

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