Journal
JOURNAL OF PEDIATRIC ORTHOPAEDICS
Volume 26, Issue 3, Pages 310-315Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/01.bpo.0000214920.54619.c7
Keywords
acetabular index; developmental dysplasia of the hip; plain radiography; magnetic resonance imaging; hip development
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This is a series of 7 children (14 hips) with a mean age of 7.3 years (range, 3.3-10.5 years) and an underlying diagnosis of developmental dysplasia of the hips and no previous open-hip surgery who underwent plain radiographic and magnetic resonance imaging (MRI) measures of bony acetabular index. There was a significant correlation between the measurement of acetabular index using plain radiography and MRI, with a Spearman correlation coefficient of 0.88 (95% confidence interval, 0.61-0.96; P < 0.001) and a mean difference between the 2 measures of 0.36 +/- 6.5 degrees. Furthermore, the bony and cartilaginous acetabular indexes as measured by MRI had a significant correlation with a Spearman correlation coefficient of 0.88 (95% confidence interval, 0.80-0.98; P < 0.001). We suggest that plain radiography is still an appropriate tool for follow-up for the nonoperated hip with developmental dysplasia and may be a good indicator of hip cartilaginous development.
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