gait symmetry analysis

The symmetry index(SI) is commonly used as a method of percentage to assess the differences between the kinematic and kinetic parameters for both lower limbs during walking or running.

The value of SI =0 indicates full symmetry,while SI >=100% indicates asymmetry.It has been shown that the SI of mean swing phase is the most significant parameter to study gait symmetry.Typically the value is below 10% for healthy people,while abnormal value is above 20%.The symmetry index is most commonly used to evaluate the gait symmetry in patients with stroke, cerebral palsy or Parkinson’s disease.

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