EP4.8 Labral Morphology in Dysplasia Patients Undergoing Combined Periacetabular Osteotomy and Hip Arthroscopy

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ID: 330933
2026
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Abstract
Abstract Purpose To evaluate the relationship between hip dysplasia, labral morphology, and prevalence of CAM deformity in patients undergoing combined periacetabular osteotomy (PAO) and hip arthroscopy (HA). Introduction PAO is a well-established surgical treatment for hip dysplasia, and concomitant HA can address intra-articular pathology. While the labrum is thought to play a compensatory role in dysplastic hips, quantitative data describing labral morphology in relation to dysplasia remains limited. It is unclear how labral morphology correlates with radiographic parameters and whether these changes are influenced by the presence of CAM deformity. Methods A retrospective review was performed on patients who underwent combined PAO and HA by a single surgeon since 2015. Radiographic parameters were measured, including alpha angle (AA), lateral center-edge angle (LCEA), acetabular index (AI), migration index (MI), and femoroepiphyseal acetabular roof (FEAR) index. Dysplasia was defined as LCEA <20°, borderline 20-25°, and normal >25°. CAM morphology was defined as AA >55°. Labral width was measured on MRI at the 11:30, 3:00, and 1:30 positions. Linear regression and independent sample t-tests were used to assess relationships between labral width and radiographic parameters. Results 41 hips were included, of which 44% were dysplastic, 34% borderline, and 22% normal. Mean labral width was 8.3mm (11:30), 8.3mm (3:00), and 8.4mm (1:30). On regression analysis, decreased LCEA was associated with increased labral width at all positions (β = −0.11, p < 0.001; β = −0.05, p = 0.04; β = −0.07, p = 0.02). Increased FEAR index was associated with greater labral width at the 11:30 position (β = 0.07, p=0.018). Group comparisons demonstrated greater labral width in dysplastic hips compared with normal hips (8.7±1.5 vs 7.3±1.2, p=0.03). CAM deformity was present in 20% of hips and was associated with decreased labral width compared with non-CAM deformed hips (7.9±1.4 vs 8.5±1.4, p < 0.01). Conclusion Labral width is inversely associated with LCEA, supporting the concept of compensatory hypertrophy in dysplastic hips. The presence of CAM deformity is associated with reduced labral width, suggesting that mixed morphology may influence labral adaptation. Future studies are needed to determine the clinical implications of these findings.
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Authors Christopher Jayne, MD Don Willier, MD Alec Grossman, Michael S. H. Kain
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.342
URL
https://doi.org/10.1093/jhps/hnag043.342
Keywords Keywords not found

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