DDH has been associated with hip pain and loss of function in young adults, and may lead to an up to six times increased risk of developing hip osteoarthritis (OA) later in life. Despite early screening at birth and during infancy, DDH can remain undetected until adulthood, with an estimated prevalence of 0.1% in the United States. In hips with DDH a moderate correlation between W-LCEA and W-ACEA was calculated indicating that joints with normal acetabular coverage on the AP view can still be undercovered on the FP view.ĭevelopmental dysplasia of the hip (DDH) is a commonly seen developmental disorder of the acetabulum, leading to undercoverage of the femoral head and increase in contact pressure on the joint cartilage. Over 4 out of 10 (43.2%) individuals’ DDH will be missed when only using the AP radiograph. There is a strong additional value of the FP radiograph in the diagnosis of DDH. A mean difference of 9.4° (SD 8.09) was present between the W-LCEA and the W-ACEA in the hips with DDH. The Pearson correlation coefficient between W-LCEA and W-ACEA of all included hips was 0.547 (95% confidence interval: 0.503–0.591) and 0.441 (95% confidence interval: 0.231–0.652) in hips with DDH. DDH was present in 74 hips (5.3%), of which 32 were only present on the FP view radiograph (43.2%). In total 720 participants (1391 hips) were included.

The correlation between the W-LCEA and W-ACEA was determined. The proportion of DDH only present on the FP view determined the FP view additional value. A threshold of <20° was used to determine DDH for both the W-LCEA and the W-ACEA. DDH was quantified on AP pelvic and FP hip radiographs using semi-automatic measurements of the W-LCEA and W-ACEA.

We used baseline data from a nationwide prospective cohort study (Cohort Hip and Cohort Knee). The aim of this study was to determine the additional value of the false-profile (FP) view radiograph in the diagnosis of developmental dysplasia of the hip (DDH), as compared with an anteroposterior (AP) pelvic radiograph only, and evaluate the correlation between the Wiberg-lateral center edge angle (W-LCEA) and Wiberg-anterior center edge angle (W-ACEA).

Hips normal xray