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Myoelectric and body-powered prostheses

L M Kruger1, S Fishman

  • 1Shriners Hospital for Crippled Children, Springfield, Massachusetts.

Journal of Pediatric Orthopedics
|January 1, 1993
PubMed
Summary
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Most children initially preferred myoelectric (MYO) prosthetic hands, but long-term use favored body-powered (BP) options. Older children demonstrated better prosthetic prehension and satisfaction with body-powered devices.

Area of Science:

  • Pediatric Orthopedics
  • Rehabilitation Engineering
  • Prosthetics and Orthotics

Background:

  • Below-elbow limb differences in children present unique challenges for prosthetic fitting and function.
  • Both myoelectric (MYO) and body-powered (BP) prostheses offer distinct advantages and disadvantages for pediatric users.
  • Understanding long-term user preference and functional outcomes is crucial for optimizing prosthetic selection.

Purpose of the Study:

  • To compare the long-term acceptance and functional outcomes of myoelectric (MYO) versus body-powered (BP) prosthetic hands in children with below-elbow amputations.
  • To evaluate the influence of age on prosthetic prehension and user satisfaction.
  • To identify factors contributing to prosthetic non-wear.

Main Methods:

Related Experiment Videos

  • A cohort of 120 children with below-elbow amputations were provided with both cosmetically similar MYO and BP prosthetic hands for a 3-month trial period.
  • User preference was recorded after the initial trial.
  • Follow-up assessments at 2 years evaluated continued prosthetic use, type of prosthesis worn, and functional prehension.
  • Prosthetic prehension capabilities were assessed based on age groups (<5, 5-8, >8 years).

    • Main Results:

    • Initially, 78% of children preferred the MYO prosthesis, while 22% preferred the BP prosthesis.
    • At the 2-year follow-up, only 44% continued to wear the MYO, 33% used a BP hand or hook, and 23% became non-wearers.
    • Active prosthetic prehension was demonstrated by 80% of children aged 8 years and older, compared to 30% aged 5-8 years, and 0% aged under 5 years.
    • Children who actively used the BP prosthesis reported higher satisfaction with its features.

    Conclusions:

    • While initially favored for aesthetics, myoelectric prostheses showed lower long-term adherence compared to body-powered options in this pediatric cohort.
    • Age significantly impacts the ability to achieve active prosthetic prehension, with older children benefiting more from advanced prosthetic technologies.
    • Body-powered prostheses may offer a more sustainable and satisfactory solution for many children, particularly regarding functional outcomes and user satisfaction.