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Bony abnormalities of the hip joint: a new comprehensive, reliable and radiation-free measurement method using

Marcie Harris-Hayes1, Paul K Commean2, Jacqueline D Patterson3

  • 1Program in Physical Therapy and Department of Orthopaedic Surgery, Washington University School of Medicine, 4444 Forest Park, Campus Box 8502, St. Louis, MO 63108, United States, .

Journal of Hip Preservation Surgery
|January 6, 2015
PubMed
Abstract

Insights

This study presents reliable, radiation-free MRI methods for quantifying hip morphology, including acetabular version (AV) and femoral version (FV). While AV, FV, femoral neck angle (FNA), and lateral center edge angle (LCEA) are reliably measured by all raters, the alpha angle (AA) requires experienced raters.

Area of Science:

  • Orthopedics
  • Radiology
  • Medical Imaging

Background:

  • Accurate quantification of femoral and acetabular morphology is crucial for diagnosing and managing hip disorders.
  • Current methods may involve radiation exposure, necessitating the development of alternative techniques.

Purpose of the Study:

  • To establish comprehensive and dependable radiation-free magnetic resonance imaging (MRI) methods for assessing femoral and acetabular morphology.
  • To evaluate the reliability of these MRI measurements among raters with varying experience levels.

Main Methods:

  • 3D fat-suppressed gradient echo MRI scans of the pelvis and distal femora were acquired from 32 hips (16 subjects).
  • Key measurements included acetabular version (AV), femoral version (FV), lateral center edge angle (LCEA), femoral neck angle (FNA), and alpha angle (AA).
  • Interrater and intrarater reliability were assessed by two experienced raters and one novice rater using Intraclass Correlation Coefficients (ICCs).

Main Results:

  • Interrater reliability was good to excellent for AV, FV, FNA, and LCEA (ICCs: 0.82-0.98) across all raters.
  • Interrater reliability for AA was good to excellent between experienced raters (ICCs: 0.78-0.86) but poor to good with novice raters (ICCs: 0.23-0.78).
  • Intrarater reliability was good to excellent for AV, FV, and FNA (ICCs: 0.93-0.99) for all raters, but varied for LCEA and AA depending on rater experience.

Conclusions:

  • Developed MRI methods provide a comprehensive and reliable approach to quantifying femoral and acetabular morphology without radiation.
  • Measurements of AV, FV, FNA, and LCEA demonstrated high reliability for both experienced and novice raters.
  • The alpha angle (AA) measurement proved reliable only among experienced raters, indicating a need for specialized training for this specific parameter.
Keywords:
femoroacetabular impingementhip dysplasiahip pain

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