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Relationship between Wiberg's lateral center edge angle, Lequesne's acetabular index, and medial acetabular bone stock

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Abstract

Objective

Knowledge of acetabular anatomy is crucial for cup positioning in total hip replacement. Medial wall thickness of the acetabulum is known to correlate with the degree of developmental dysplasia of the hip (DDH). No data exist about the relationship of routinely used radiographic parameters such as Wiberg's lateral center edge angle (LCE-angle) or Lequesne's acetabular index (AI) with thickness of the medial acetabular wall in the general population. The aim of our study was to clarify the relationship between LCE, AI, and thickness of the medial acetabular wall.

Materials and methods

Measurements on plain radiographs (LCE and AI) and axial CT scans (quadrilateral plate acetabular distance QPAD) of 1,201 individuals (2,402 hips) were obtained using a PACS imaging program and statistical analyses were performed.

Results

The mean thickness of the medial acetabulum bone stock (QPAD) was 1.08 mm (95% CI: 1.05-1.10) with a range of 0.1 to 8.8 mm. For pathological values of either the LCE (<20°) or the AI (>12°) the medial acetabular wall showed to be thicker than in radiological normal hips. The overall correlation between coxometric indices and medial acetabular was weak for LCE (r =−0.21. 95% CI [−0.25, -0.17]) and moderate for AI (r = 0.37, [0.33, 0.41]).

Conclusions

We did not find a linear relationship between Wiberg's lateral center edge angle, Lequesne's acetabular index and medial acetabular bone stock in radiological normal hips but medial acetabular wall thickness increases with dysplastic indices.

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Authors and Affiliations

  1. Department of Orthopaedics, Balgrist University Hospital Zurich, Forchstrasse, 340 8008, Zurich, Switzerland

    Clément M.L. Werner, Thomas Ruckstuhl & Samy Bouaicha

  2. R. Adams Cowley Shock Trauma Center, University of Maryland Medical Systems, 22 South Greene Street, Baltimore, MD, 21201, USA

    Clément M.L. Werner, Carol E. Copeland, Jeff Stromberg & Clifford H. Turen

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  1. Clément M.L. Werner
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  2. Carol E. Copeland
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Correspondence to Clément M.L. Werner.

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Werner, C.M., Copeland, C.E., Ruckstuhl, T. et al. Relationship between Wiberg's lateral center edge angle, Lequesne's acetabular index, and medial acetabular bone stock. Skeletal Radiol 40, 1435–1439 (2011). https://doi.org/10.1007/s00256-011-1141-3

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  • DOI: https://doi.org/10.1007/s00256-011-1141-3

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