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Does having a computerized prosthetic knee influence cognitive performance during amputee walking?

Rhonda M Williams1, Aaron P Turner, Michael Orendurff

  • 1VA Puget Sound Health Care System, Seattle, WA 98108, USA. Rhonda.Williams1@med.va.gov

Archives of Physical Medicine and Rehabilitation
|July 4, 2006
PubMed
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Computerized prosthetic knees did not improve cognitive performance but were perceived as less burdensome by experienced amputees during walking. Noncomputerized options may suffice for many users.

Area of Science:

  • Prosthetics and Biomechanics
  • Neuroscience and Cognitive Science
  • Rehabilitation Engineering

Background:

  • Transfemoral amputees utilize prosthetic knees to restore mobility.
  • Cognitive burden associated with prosthetic use can impact daily function.
  • Computerized prosthetic knees offer advanced features compared to noncomputerized designs.

Purpose of the Study:

  • To compare cognitive performance and perceived cognitive burden between computerized (Otto Bock C-leg) and noncomputerized (Ossur Mauch SNS) prosthetic knees.
  • To evaluate the impact of different prosthetic knee types on cognitive load during walking tasks.

Main Methods:

  • A two-group crossover trial involving eight transfemoral amputees.
  • Participants underwent assessments during self-selected and controlled speed walking conditions.

Related Experiment Videos

  • Objective cognitive measures included verbal fluency, attention, working memory, and walking speed; subjective measures assessed perceived cognitive burden.

    • Main Results:

    • No significant differences in objective cognitive performance were observed between the computerized and noncomputerized prosthetic knees.
    • Walking speed did not differ between the two prosthetic knee types during free-speed walking.
    • Participants reported lower attentional requirements and cognitive burden with the computerized C-leg compared to the noncomputerized prosthesis.

    Conclusions:

    • Experienced amputees perceive computerized prosthetic knees as less cognitively demanding, though this subjective experience does not enhance objective performance in basic walking tasks.
    • Noncomputerized prosthetic knees may be adequate for the majority of amputees.
    • Further research should identify specific amputee populations who could benefit from advanced computerized prosthetic technology.