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Related Experiment Video

Updated: May 3, 2026

Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis
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South African users' function and experience with a magnetorheological microprocessor knee: A mixed methods study.

S Visagie1, B Theron2

  • 1University of Stellenbosch, Division of Disability and Rehabilitation Studies, Faculty of Medicine and Health Sciences, South Africa.

Canadian Prosthetics & Orthotics Journal
|September 4, 2025
PubMed
Summary
This summary is machine-generated.

Microprocessor knees (MPKs) significantly improved walking speed and function for South African users, though not all individuals benefit. Further research is needed to determine long-term suitability and cost-effectiveness.

Keywords:
AmputationKnee DisarticulationL-TestLower Middle-Income CountriesMPKsMicroprocessor KneeProsthetic PrescriptionRehabilitationRheo XCSouth AfricaTransfemoralTranstibial

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Area of Science:

  • Prosthetics and Orthotics
  • Rehabilitation Engineering
  • Biomedical Engineering

Background:

  • Microprocessor knees (MPKs) enhance prosthetic walking safety and confidence.
  • High cost of MPKs limits access in low- and middle-income countries like South Africa.
  • Limited local evidence hinders justification for MPK funding and prescription.

Purpose of the Study:

  • To evaluate the functional outcomes and user experiences of the Rheo XC MPK in South Africa.
  • To provide context-specific evidence for MPK funding and prescription decisions.

Main Methods:

  • Explanatory sequential mixed-methods design combining quantitative pre-test/post-test and qualitative studies.
  • 16 participants with lower-limb amputations used their regular knees then trialed the Rheo XC MPK.
  • Functional level scale, L-Test, Wilcoxon Signed-Rank test, and semi-structured interviews were employed.

Main Results:

  • Significant improvements in walking speed (p < 0.001) and functional level scores (p < 0.001) were observed.
  • L-Test completion time decreased by an average of 7.5 seconds.
  • Qualitative data revealed user acceptance alongside real-world limitations, indicating MPKs are not universally suitable.

Conclusions:

  • The study provides valuable local evidence supporting MPK use in South Africa.
  • MPK suitability varies; a trial period is recommended before prescription.
  • Further research with longer trial durations is advised to assess long-term effectiveness.