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Is labral hypotrophy correlated with increased acetabular depth?

Felix Toft¹, Elmar Anliker², Martin Beck³

¹1. Schulthess Klinik Zurich, Team Obere Extremitäten, Lengghalde 2, 8008 Zurich, Switzerland; 3. Head of Orthopaedic Department, Luzerner Kantonsspital Luzern, 6000 Luzern 16, Switzerland.

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Summary

Labral size in hip dysplasia correlates with acetabular coverage. Smaller labra (hypotrophic) were associated with better coverage, while larger labra (hypertrophic) indicated poorer coverage, impacting hip joint health.

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Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse

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Published on: April 17, 2019

Area of Science:

Orthopedics
Radiology
Hip Joint Pathologies

Background:

Labral hypertrophy is common in hip dysplasia.
Hypotrophic labra are rarely observed, with no existing literature on this condition.
The relationship between labral size and acetabular coverage in hip dysplasia is not well-defined.

Purpose of the Study:

To investigate the correlation between hip labral size and radiologic parameters of acetabular coverage.
To test the hypothesis that smaller labral size is negatively correlated with acetabular coverage.

Main Methods:

Categorized labra into hypotrophic, normal, and hypertrophic groups based on height-to-length ratio.
Measured labral cross-sectional area (CSA) using MRI-arthrography in 50 hips.
Analyzed CSA against radiographic parameters: neck-shaft angle (NSA), lateral center-edge angle (LCE), acetabular index (AI), femoral extrusion index (FEI), and acetabular retroversion index (ARI).

Main Results:

Significant differences in mean labral CSA were found across all groups (hypotrophic: 12.1 mm², normal: 25.2 mm², hypertrophic: 41.1 mm²).
NSA, LCE, AI, and FEI differed significantly between hypertrophic and hypotrophic/normal groups.
Labral CSA showed a significant correlation with the LCE angle (R²=0.301).
Hypotrophic labra were associated with the highest mean acetabular coverage, while hypertrophic labra had the lowest.

Conclusions:

Hip labral size significantly correlates with acetabular coverage parameters, particularly the LCE angle.
Hypotrophic labra are linked to better acetabular coverage, whereas hypertrophic labra are associated with poorer coverage.
Further research is warranted to understand the clinical implications of hypotrophic labra in hip dysplasia.