FP8.4 POSTERIOR ACETABULAR COVERAGE DRIVES BILATERAL ASYMMETRY ACROSS MORPHOLOGICAL PATTERNS: A SECTOR ANGLE–BASED CT STUDY

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ID: 331258
2026
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Abstract
Abstract ICLA08 - AI and 3D Simulations: Trustworthy Clinical Partners or Tech Hype? Auditorium B (BMCC Level 1), October 8, 2026, 14:00 - 16:00 Purpose To propose and evaluate a novel classification of acetabular morphology based on anterior and posterior sector angles, and to analyze its distribution, demographic associations, and bilateral symmetry in a cohort of patients undergoing hip imaging. Methods A retrospective analysis of 48 (96 hips) patients was performed using axial computed tomography. Acetabular morphology was characterized by using acetabular version (VA), anterior acetabular sector angle (AASA), posterior acetabular sector angle (PASA), and global coverage (HASA = AASA + PASA). Patients were classified into five patterns: normal, anterior over-coverage , global overcoverage, posterior deficiency, and global undercoverage based on predefined thresholds. Associations between patterns and demographic variables (age and sex) were analyzed. Bilateral comparisons of AASA, PASA, and HASA were performed using paired statistical tests. Results The cohort had a mean age of approximately 65 years (range, 15–86) and was predominantly male (67%). The most common pattern was normal morphology (31%), followed by anterior overcoverage (27%), global overcoverage (21%), posterior deficiency (13%), and global undercoverage (8%). Overcoverage patterns accounted for 48% of cases. No statistically significant differences in age (p = 0.075) or sex distribution (p = 0.20) were observed across patterns. However, a trend toward increased anterior overcoverage in males and undercoverage in females was noted. Bilateral analysis demonstrated no significant differences in AASA (p = 0.21), but a significant side-to-side difference in PASA was identified (p = 0.04), with HASA showing a trend toward asymmetry (p = 0.06). Conclusion Acetabular morphology in this cohort was predominantly characterized by overcoverage patterns and was not associated with demographic factors. Bilateral asymmetry was primarily driven by differences in posterior acetabular coverage (PASA), highlighting its potential role in hip pathomechanics. The proposed sector angle–based classification integrates anterior, posterior, and global acetabular coverage, and may enhance the assessment of hip morphology beyond traditional radiographic parameters by emphasizing posterior coverage, an underrecognized factor that could improve diagnostic accuracy and inform surgical decision making.
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Authors Jose Castillo de la Peña, Cesar Alejandro Jimenez Aroche, Jose Eduardo Miranda Mayen, Martha Acosta Pavon, Vanessa Nava Vargas, Omar Alberto Valdez Lopez, Jacobo Kerbel Sutton
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.060
URL
https://doi.org/10.1093/jhps/hnag043.060
Keywords Keywords not found

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