Abstract
Developmental dysplasia of the hip (DDH) is a spectrum of diseases ranging from frank dislocation of the hip to mild acetabular dysplasia. DDH screening for detection is performed routinely in our country using pelvic x-ray at 3 months of age. The radiographic measured acetabular index is used to evaluate the dysplastic hip, at initial presentation and during follow-up.
Objective: Evaluation of the intra- and inter-observer variability, among medical professionals, when measuring acetabular index.
Methods: Four reviewers (a children orthopedic surgeon, a general practitioner, a pediatrician and a radiologist) performed acetabular index measurement in 100 radiographs (200 hips), on three occasions, separated each by one month (600 total measurements). An independent observer evaluated the measurement reproducibility. The intra-class correlation coefficient to determine significant differences was used.
Results: The intra-observer variability was less than the inter-observer variability. The intra-observer variability was similar among the different assessors, ± 1.5 degrees. The inter-observer variability was ± 3.4 degrees.
Conclusions: A high concordance among measurements was reported, evidencing a high reproducibility of the acetabular index; this index is a reliable method for the diagnosis and follow-up of acetabular dysplasia.
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