, Volume 471, Issue 6, pp 1946-1954
Date: 21 Mar 2013

Variations in the Use of Diagnostic Criteria for Developmental Dysplasia of the Hip

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Abstract

Background

Wide variation exists in reported prevalence estimates and management standards of developmental dysplasia of the hip (DDH). Discrepancies in diagnosticians’ opinions may explain some of this variation.

Questions/purposes

We sought to determine (1) the consistency with which pediatric orthopaedic surgeons rate the importance of diagnostic criteria for DDH, and (2) whether there were geographic differences in how the diagnostic criteria were rated by surgeons.

Methods

One hundred ninety-seven of 220 members of the European Paediatric Orthopaedic Society and 100 of 148 members of the British Society of Children’s Orthopaedic Surgery treating children with DDH participated in this cross-sectional study across 35 countries (15 regions). Each rated 37 items in four domains that specialists previously had identified as the most important features associated with DDH in early infancy. We determined consistency using the intraclass correlation coefficient (ICC; two-way random-effects model) interpreted as poor (0–0.40), acceptable (0.41–0.74), or good (≥ 0.75).

Results

Poor consistency among surgeons was found in rating the 37 diagnostic criteria (ICC, 0.33; 95% CI, 0.24–0.45). Consistency was poor for three domains (patient characteristics/history: ICC, 0.29; 95% CI, 0.16–0.58; ultrasound: ICC, 0.26; 95% CI, 0.14–0.52; radiography: ICC, 0.34; 95% CI, 0.12–0.95) and acceptable for one (clinical examination: ICC, 0.50; 95% CI, 0.33–0.73). Surgeons in particular regions appeared to have a concept of DDH diagnosis that distinguished them from specialists of other regions; consistency in eight regions was greater (ICC ≥ 0.40) than consistency among all 15 regions.

Conclusions

The consistency of specialists in rating diagnostic criteria for DDH was lower than expected, and there was considerable geographic variation in terms of how specialists assigned importance ratings of the diagnostic criteria; these findings are somewhat counterintuitive, given the frequency with which this condition is diagnosed. These inconsistencies could explain, partly, the widely differing prevalence estimates and management standards of DDH.

The institution of one or more of the authors (AR) has received, during the study period, funding from Bupa Foundation and Great Ormond Street Hospital Children’s Charity.
All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research editors and board members are on file with the publication and can be viewed on request.
Each author certifies that his or her institution approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.
A comment to this article is available at http://dx.doi.org/10.1007/s11999-013-2971-1.