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Association Between the Elasticity of Hip Muscles and the Hip Migration Index in Cerebral Palsy

Pinar Doruk Analan1, Hulya Aslan2

  • 1Department of Physical Medicine and Rehabilitation, Baskent University Faculty of Medicine, Istanbul, Turkey.

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|February 20, 2019
PubMed

Insights

This study found that hip flexor and adductor muscle elasticity in children with cerebral palsy (CP) correlates with hip migration index (MI). However, increased elasticity does not definitively cause hip dislocation in CP patients.

Area of Science:

  • Pediatric Orthopedics
  • Medical Imaging
  • Rehabilitation Medicine

Background:

  • Cerebral palsy (CP) elevates the risk of hip displacement in children.
  • Abnormal hip muscle forces are suspected predisposing factors for hip displacement in CP.
  • The Reimers hip migration index (MI) is a standard radiographic measure for hip displacement in CP.

Purpose of the Study:

  • To investigate the correlation between hip muscle elasticity, measured by shear wave elastography, and the hip migration index (MI) in children with CP.
  • To analyze the association between the elasticity of hip flexor and adductor muscles and the MI.
  • To examine the relationship between the elasticity of agonist/antagonist hip muscles and the MI.

Main Methods:

  • Prospective study including bilateral hips of 25 children with spastic CP.
  • Hip migration index (MI) measured using anteroposterior pelvic radiographs.
  • Shear wave elastography used to assess hip flexor, adductor, and agonist/antagonist muscle elasticity.

Main Results:

  • Fair to good correlations (r values between 0.52 and 0.71) were observed between MI and hip flexor/adductor elasticity.
  • Mean MIs were 22.64% ± 7.79% (reader 1) and 21.55% ± 8.83% (reader 2).
  • Little to weak correlations (r values between -0.07 and 0.32) found between agonist/antagonist muscle elasticity and MI.

Conclusions:

  • Hip flexor and adductor muscle elasticity shows a correlation with the hip migration index in children with CP.
  • The current findings suggest a link but do not establish causality between increased hip flexor/adductor muscle elasticity and hip dislocation in CP.
Abstract

Keywords:
cerebral palsyelastographyhip migration indexhip muscle

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