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Designs and performance of three new microprocessor-controlled knee joints.

Julius Thiele1, Christina Schöllig1, Malte Bellmann2

  • 1Technische Universität Berlin, Medical Technology Group, Dovestr. 6, D-10587 Berlin, Germany.

Biomedizinische Technik. Biomedical Engineering
|February 10, 2018
PubMed
Summary

Microprocessor-controlled knee joints (MPKs) vary in function. Optimal performance requires adaptive resistance control, which not all MPKs offer, impacting user outcomes.

Keywords:
amputeeknee jointlevel walkingmicroprocessor-controlprosthesistransfemoral

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Area of Science:

  • Biomedical Engineering
  • Prosthetics and Orthotics
  • Biomechanics

Background:

  • Microprocessor-controlled prosthetic knee joints (MPKs) offer advanced functionality.
  • Differences in mechanical design and control algorithms significantly influence user outcomes.

Purpose of the Study:

  • To evaluate and compare the performance of three MPKs: C-Leg 4, Plié 3, and Rheo Knee 3.
  • To investigate how inherent design differences affect functional characteristics during walking.

Main Methods:

  • A crossover design study involving a small group of subjects.
  • Performance evaluation during level-ground walking at various speeds in a motion analysis laboratory.
  • Technical analysis including patents, documentation, and X-ray computed tomography (CT).

Main Results:

  • C-Leg 4 and Rheo Knee 3 allow microprocessor-controlled adaptation of joint resistances for different gait velocities.
  • Plié 3 lacks stance extension damping capability.
  • Adaptive resistance control is crucial for realizing the full benefits of MPKs.

Conclusions:

  • MPK performance is highly dependent on adaptive resistance control for flexion and extension.
  • Not all users may benefit from all MPK functions, necessitating a match between user needs and device capabilities.
  • Careful consideration of user demands versus device performance is essential for maximizing user outcomes.