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Forces and impulses during aided gait.

K A Opila1, A C Nicol, J P Paul

  • 1Department of Biomechanics, New York Institute of Technology, Old Westbury 11568.

Archives of Physical Medicine and Rehabilitation
|October 1, 1987
PubMed
Summary
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This study quantifies walking aid contributions to locomotion in patients with total hip replacement, tibial fracture, and paraplegia. Impulse histograms reveal aid usage patterns, aiding in prescription, training, and design.

Area of Science:

  • Biomechanics
  • Rehabilitation Engineering

Background:

  • Musculoskeletal and neuromuscular disorders impair locomotion.
  • Walking aids are crucial for stability, support, and propulsion in affected individuals.

Purpose of the Study:

  • To quantify the relative contributions of limbs and walking aids to locomotion.
  • To analyze aid forces and their temporal relationships with limb function.
  • To evaluate aid usage in specific patient populations.

Main Methods:

  • Recorded aid forces and resolved them into three components.
  • Measured floor-to-foot forces (anterior-posterior and vertical).
  • Interpreted results using temporal relationships, force symmetry, and peak forces.
  • Utilized impulse histograms to demonstrate limb and aid contributions.

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Main Results:

  • Variability in aid loadings observed in total hip replacement (THR) patients and between different walking sticks.
  • Symmetrical restraining and propelling aid loadings noted in tibial fracture patients.
  • Medial aid impulses exceeded anterior-posterior impulses in most subjects using three-point gait.

Conclusions:

  • Impulse histograms effectively quantify walking aid usage.
  • This technique can inform prescription, sizing, and gait training.
  • Findings can guide the design of improved walking aids and crutches.