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Symptomatic femoroacetabular impingement: does the offset decrease correlate with cartilage damage? A pilot study.

Christoph Zilkens1, Falk Miese, Rüdiger Krauspe

  • 1Medical Faculty, Department of Orthopedic Surgery, University of Düsseldorf, Düsseldorf, Germany. christoph.zilkens@med.uni-duesseldorf.de

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|January 31, 2013
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Summary

The beta angle, a new measure for hip deformity, is reproducible on MRI and correlates with cartilage damage in hip impingement. This may improve assessment for slipped capital femoral epiphysis (SCFE) follow-up.

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Area of Science:

  • Orthopedic surgery
  • Radiology
  • Biomechanical analysis

Background:

  • Current slipped capital femoral epiphysis (SCFE) assessments like the alpha angle may not fully capture deformity magnitude or mechanical consequences.
  • The beta angle, considering both femoral and acetabular morphology, may offer a more accurate measure of hip deformity.

Purpose of the Study:

  • To determine the reliability of beta angle measurement on MRI.
  • To assess the correlation between the beta angle and cartilage status.

Main Methods:

  • Three-dimensional MRI with delayed gadolinium-enhanced MRI of cartilage (dGEMRIC) was performed on 10 patients with cam femoroacetabular impingement and 15 controls.
  • Alpha and beta angles, along with acetabular dGEMRIC indices, were measured in seven hip regions.

Main Results:

  • Beta angle measurements demonstrated high reproducibility, similar to alpha angles.
  • A correlation was observed between beta angles and cartilage status (dGEMRIC indices) in the superoinferior and superior hip regions.

Conclusions:

  • Beta angle measurement is reproducible on radial MRI scans.
  • The beta angle shows potential as a valuable tool for assessing hip deformity and cartilage status in SCFE follow-up.