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Using a numerical method to precisely evaluate the alpha angle in a hip image.

Chung-Liang Lai1,2, Wei-Min Chi3, Ying-Jui Ho4

  • 1Department of Occupational Therapy, Asia University, Taichung, Taiwan, Republic of China.

Medical & Biological Engineering & Computing
|April 10, 2019
PubMed
Summary
This summary is machine-generated.

A new numerical method improves the measurement of the alpha angle for diagnosing cam-type femoroacetabular impingement (FAI). This repeatable technique enhances accuracy in assessing hip morphology, aiding early FAI detection.

Keywords:
Alpha angleFemoral neck axisFemoroacetabular impingementNumerical method

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Area of Science:

  • Orthopedics
  • Radiology
  • Biomedical Engineering

Background:

  • Cam-type femoroacetabular impingement (FAI) diagnosis relies on the alpha angle measured from 2D hip images.
  • Conventional alpha angle measurement is subjective, leading to measurement errors and poor inter-rater/intra-rater agreement.

Purpose of the Study:

  • To develop and validate a novel, objective numerical method for measuring the alpha angle.
  • To improve the repeatability and agreement of alpha angle measurements in diagnosing FAI.

Main Methods:

  • A curve fitting method was used to define the femoral neck and head morphology from 2D images.
  • The femoral neck was modeled using two polynomials, and the femoral head was represented by a circle equation.
  • Sampling points from image edges were used for curve fitting.

Main Results:

  • High inter-rater intraclass correlation coefficients (ICCs) were achieved: 0.905 for X-ray and 0.969 for MRI.
  • Good intra-rater ICCs were observed: 0.892 for X-ray and 0.840 for MRI.
  • Linear regression showed a significant association between the proposed and conventional methods (p < 0.001).

Conclusions:

  • The proposed numerical method offers a repeatable and agreed-upon approach for alpha angle measurement.
  • This method aids in distinguishing normal from abnormal femoral head-neck morphologies.
  • The technique facilitates the early diagnosis of femoroacetabular impingement (FAI).