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Performance specification for lower limb orthotic devices.

G R Johnson1, M Ferrarin, M Harrington

  • 1Centre for Rehabilitation and Engineering Studies, University of Newcastle, Newcastle NE1 7RU, UK.

Clinical Biomechanics (Bristol, Avon)
|August 4, 2004
PubMed
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This study quantifies forces on lower limb orthoses during walking, finding median maximum normalized ankle moments of 0.15 and knee/hip moments of 0.09. Gait analysis effectively estimates orthotic loads without transducers.

Area of Science:

  • Biomechanics
  • Orthotics and Prosthetics
  • Rehabilitation Engineering

Background:

  • Orthotic design traditionally relies on evolution, lacking formal engineering principles.
  • Limited data on forces and moments during ambulation hinders advanced orthotic design.

Purpose of the Study:

  • To determine the range of forces and moments applied to lower limb orthoses during routine ambulation.
  • To establish a baseline for engineering-driven orthotic development.

Main Methods:

  • Utilized established gait analysis techniques to measure joint loading in 164 patients across four European labs.
  • Employed in-house biomechanical models to calculate joint moments, normalizing data by patient weight and leg length.

Main Results:

Related Experiment Videos

  • Median maximum normalized ankle moment transmitted by ankle-foot orthoses was 0.15.
  • Maximum normalized knee and hip moments for hip-knee-ankle-foot orthoses were 0.09.
  • Significant data variability observed, attributed to diverse patient impairments.

Conclusions:

  • Established gait analysis procedures can estimate orthotic loads without requiring load measurement transducers.
  • Future research should focus on expanding datasets and conducting validation studies with transducers.