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Revista chilena de pediatría

versión impresa ISSN 0370-4106

Resumen

IBANEZ L, ANGÉLICA et al. Variability in measurement of acetabular index. Rev. chil. pediatr. [online]. 2013, vol.84, n.2, pp.160-165. ISSN 0370-4106.  http://dx.doi.org/10.4067/S0370-41062013000200006.

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.

Palabras clave : Developmental dysplasia of the hip (DDH); acetabular index; intra-observer variability; inter-observer variability; radiography.

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