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. 2021 Oct;92(5):575-580.
doi: 10.1080/17453674.2021.1936918. Epub 2021 Jul 9.

Hip dysplasia is not uncommon but frequently overlooked: a cross-sectional study based on radiographic examination of 1,870 adults

Rebecka Leide  1   2 , Anna Bohman  3 , Daniel Wenger  1   4 , Søren Overgaard  5   6 , Carl Johan Tiderius  1   4 , Cecilia Rogmark  1   4
Affiliations

Hip dysplasia is not uncommon but frequently overlooked: a cross-sectional study based on radiographic examination of 1,870 adults

Rebecka Leide et al. Acta Orthop. 2021 Oct.

Abstract

Background and purpose - Hip dysplasia in adults is a deformity in which the acetabulum inadequately covers the femoral head. The prevalence is sparingly described in the literature. We investigated the prevalence in Malmö (Sweden) and assessed whether the condition was recognized in the radiology reports.Subjects and methods - All pelvic radiographs performed in Malmö during 2007-2008 on subjects aged 20-70 years with a Swedish personal identity number were assessed. 1,870 digital radiographs were eligible for analysis. The lateral center-edge angle (LCEA) and acetabular index angle (AIA) were measured. Hip dysplasia was defined as an LCEA ≤ 20°. Intraclass correlation coefficients (ICC) for intra-observer measurements ranged from 0.87 (AIA, 95% CI 0.78-0.93) to 0.98 (LCEA, CI 0.97-0.99).Results - The prevalence of hip dysplasia (LCEA ≤ 20°) was 5.2% (CI 4.3-6.3), (98/1,870). There was no statistically significant difference between the sexes for either prevalence of hip dysplasia or mean LCEA. The mean AIA was 0.9° (CI 0.3-1.3) higher in men (4.1 SD 5.5) compared with women (3.2 SD 5.4). The radiologists had reported hip dysplasia in 7 of the 98 cases.Interpretation - The prevalence of hip dysplasia in Malmö (Sweden) is similar to previously reported data from Copenhagen (Denmark) and Bergen (Norway). Our results indicate that hip dysplasia is often overlooked by radiologists, which may influence patient treatment.

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Figures

Figure 1.
Figure 1.
Flowchart of exclusion steps resulting in the study population of 1,870 subjects. For detailed exclusion criteria see “Study design and population”.
Figure 2.
Figure 2.
Example of output using the 2D dysplasia guide of the Sectra Planning System. AI = acetabular index angle (termed AIA in the text); CE = centre edge angle (termed LCEA in the text).
Figure 4.
Figure 4.
Distribution of the right and left AIA in 1,870 adults. For right hips, the mean AIA was 4.1 (SD 5.5) and the range of 2 SDs –6.9 to 15.0. For left hips, the mean AIA was 3.2 (SD 5.4) and the range of 2 SDs –7.7 to 13.9.
Figure 3.
Figure 3.
Distribution of the right and left LCEA in 1,870 adults. For right hips, the mean LCEA was 32 (SD 6.9) and the range of 2 SDs 18.1–45.6. For left hips, the mean LCEA was 33 (SD 6.6) and the range of 2 SDs 20.2–46.7.
See this image and copyright information in PMC

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