ArticleJournal of experimental orthopaedics2026
Introducing functional dysplasia: Dynamic pelvic mechanics during running reduce femoral head coverage.
Article in Journal of experimental orthopaedics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Purpose: To investigate the influence of peak contralateral pelvic drop and ipsilateral femoral adduction during running on traditional radiographic parameters of femoral head coverage. Methods: This cross-sectional retrospective study included 19 patients (38 hips), 9 males and 10 females, with a mean age of 40 ± 10 years, all presenting with symptomatic unilateral femoroacetabular impingement. Participants underwent a three-dimensional running analysis and anteroposterior pelvic radiographs. Using specialised software, the femur and pelvis were rotated in the coronal plane based on the peak angles of contralateral pelvic drop and femoral adduction obtained from the biokinetic running analysis. After prior validation, traditional femoral head coverage parameters were assessed on both standard and adjusted radiographs, and the variation of each radiographic measurement was obtained. Results: The mean contralateral pelvic drop and ipsilateral femoral adduction were 4.6° ± 3.8° and 5.3° ± 2.6°, respectively. Comparing adjusted with standard radiographs, the lateral centre-edge angle significantly decreased by 4.8° ± 4.1° ( Conclusion: This study demonstrated that femoral head coverage significantly decreases due to contralateral pelvic drop during running. This results in an increased number of dysplastic findings on adjusted radiographs. Patients with significant contralateral pelvic drop and ipsilateral femoral adduction during running may be at risk for functional dysplasia. Level of Evidence: Level III, retrospective cross-sectional.
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