EP4.17 Identifying Global Three-Dimensional Acetabular Morphologic Characteristics Associated with Radiographic Lateral Center-Edge Angle Measurements

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ID: 331163
2026
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Abstract
Abstract Background Femoroacetabular impingement syndrome (FAIS) outcomes following hip arthroscopy vary when considering decreased lateral center edge angles (LCEA). Understanding the relationship between two-dimensional radiographic findings and three-dimensional (3D) morphology of the acetabulum may contribute to defining the spectrum of hip dysplasia. While previous literature has focused on two-dimensional global measures of acetabular coverage, regional 3D differences in acetabular morphology remain to be determined. Methods Patients treated by a single fellowship trained hip arthroscopist surgeon between February 2016 and October 2020 with available MRI and enrollment in a prospective imaging registry were identified. The MRIs providing advanced imaging of the acetabulum were segmented. Statistical shape modeling (SSM) was performed to compare acetabular morphology between normal coverage patients (LCEA >25°) and under covered patients (LCEA ≤25°). Results A total of 104 MRI scans were segmented to generate 3D acetabular models. Of these, 31 patients had an LCEA ≤25° and were compared to 73 hips with an LCEA >25°. SSM demonstrated distinct regional differences in acetabular morphology in the under covered group. Notably, the depth of the acetabular fossa decreased by approximately 0.5–1.0 mm throughout virtually the entire fossa in the under covered group, suggesting an involution of the acetabular fossa as lateral coverage decreases. Additionally, the under covered group exhibited recession of the superior acetabular rim by 1.0 mm and recession of the anterior and anteroinferior acetabular rim ranging from 0.5 mm to 1.0 mm when compared to the normal coverage group. Conclusions Patients with decreased lateral coverage exhibit interrelated recession of the anterior margins of the acetabulum alongside involution of the acetabular fossa, suggesting less available bony surface area for femoral head coverage. These 3D morphological findings underscore the importance of incorporating advanced imaging and 3D planning when evaluating and treating patients with borderline or frank hip dysplasia.
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Authors Ty Monty, Jack Yang, Joseph Brinkman, Steven P. Mell, Kristen Barton, Philip J. Malloy, Shane Nho, Catherine Yuh
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.351
URL
https://doi.org/10.1093/jhps/hnag043.351
Keywords Keywords not found

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