Background/Purpose: The relationship between acetabular dysplasia (HD) and hip osteoarthritis remains unclear, especially for mild forms of dysplasia. Our objectives were to estimate the prevalence of HD in a population-based sample with hip symptoms and to evaluate potential associations linking HD, hip osteoarthritis, and hip pain.

Methods: Individuals 40 to 75 years of age with symptoms in one or both hips were recruited during a multiregional prevalence survey. All study participants underwent a physical examination and radiographs. Radiographs were evaluated using Kellgren and Lawrence (KL) staging (with stages ≥2 indicating hip osteoarthritis) and HD parameters (center-edge [CE] angle, acetabular inclination angle [HTE], acetabular depth [AD], and vertical-center-anterior margin [VCA] angle).

Results: We studied both hips of 842 individuals (1684 hips) among whom 203 had hip osteoarthritis. Compared to left hips, right hips had significantly smaller CE angles and significantly greater AD and HTE values (P≤0.001). Overall, the prevalence of HD ranged from 7.6% to 22.2% of the hips depending on the parameter used. The prevalence of HD was higher in individuals with hip osteoarthritis, with significant differences for abnormal HTE (19.1% vs. 11.4%; P<0.0001) and abnormal CE (11.3% vs. 7.5%; P=0.04). By logistic regression, only abnormal HTE remained associated with OA (P=0.05). Hip pain was more common in individuals with HD (P<0.0001) but the association was not statistically significant after stratification on osteoarthritis status (P=0.25).

Conclusion: Our study confirms the relationship between osteoarthritis and HD, particularly defined based on the HTE angle. HD was not associated with hip pain.

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ACR Meeting Abstracts - https://acrabstracts.org/abstract/relation-between-hip-dysplasia-pain-and-osteoarthritis-in-a-cohort-of-patients-with-hip-symptoms/