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Significant morphological change in osteoarthritic hips identified over 6-12 months using statistical shape

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  • 1School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, UK; Medicines Monitoring Unit (MEMO), Division of Molecular & Clinical Medicine, School of Medicine, University of Dundee, UK.

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Statistical Shape Modelling (SSM) effectively tracks hip shape changes over 12 months, offering a sensitive method for monitoring osteoarthritis (OA) progression and treatment response.

Keywords:
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Area of Science:

  • Orthopedics and Sports Medicine
  • Radiology and Medical Imaging
  • Biomedical Engineering

Background:

  • Osteoarthritis (OA) prediction, progression assessment, and treatment response monitoring are critical for developing effective therapies.
  • Statistical Shape Modelling (SSM) quantifies geometric variations in the hip joint, offering a comprehensive approach to shape analysis.

Purpose of the Study:

  • To evaluate the responsiveness of Statistical Shape Modelling (SSM) in detecting changes in hip shape over a 12-month period.
  • To assess SSM's sensitivity in capturing early signs of hip osteoarthritis (OA) progression.

Main Methods:

  • Sixty-two participants (mean age 67.1 years) underwent dual-energy X-ray Absorptiometry at baseline, 6, and 12 months.
  • Subjects were classified by Kellgren-Lawrence grading (KLG) into control/doubtful (KLG < 1), moderate (KLG = 2), and severe (KLG ≥ 3) OA groups.
  • Hip morphology was quantified using SSM, and shape changes were analyzed using generalized estimating equations and standardized response means (SRMs).

Main Results:

  • Three SSM modes (1, 3, and 4) correlated with OA severity (KLG0-KLG4).
  • SRM magnitudes across the cohort ranged from 0.16 to 0.63.
  • The highest SRM (0.91) was observed over 12 months in the moderate OA subgroup (KLG2).

Conclusions:

  • Statistical Shape Modelling (SSM) demonstrates sensitivity in capturing hip shape alterations over 6 and 12 months.
  • SSM provides a valuable and sensitive quantitative measure for assessing hip osteoarthritis progression.
  • This technique aids in monitoring disease progression and evaluating early treatment responses in clinical settings.