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Area of Science:

  • Biomechanics
  • Prosthetics
  • Rehabilitation Engineering

Background:

  • Navigating uneven terrain requires different musculoskeletal demands than level walking.
  • Transtibial amputees often use hip-dominant strategies due to lack of ankle plantar flexor power.
  • Previous studies show myoelectric prosthesis use can retain passive device mechanics due to motor memory.

Purpose of the Study:

  • To investigate if individuals with transtibial amputation utilize the power capabilities of a myoelectric bionic prosthesis during a simulated curb-stepping task.
  • To compare biomechanical parameters and user preference between a powered bionic prosthesis and a passive prosthesis.

Main Methods:

  • Six individuals with transtibial amputation performed a simulated curb-stepping task using a direct proportional myoelectric controlled Open Source Leg prosthesis.
  • Measurements included step time, prosthetic preference, muscle activity, kinematics, and kinetics.
  • Comparison was made between bionic and passive prosthesis conditions.

Main Results:

  • Participants used similar prosthetic ankle power and mechanics with the bionic prosthesis as with their passive prosthesis, despite the bionic device's higher capacity.
  • No significant differences were found in peak prosthetic ankle power or work between the bionic and passive prostheses.
  • Powered prosthesis use led to increased intact limb hip work and residual limb quadriceps activity, with 4/6 participants preferring the powered option.

Conclusions:

  • Individuals with transtibial amputation may not automatically exploit the full capabilities of powered bionic prostheses due to ingrained movement patterns.
  • Extended training or biofeedback interventions may be necessary to facilitate adaptation to powered prostheses for enhanced function.
  • User preference for powered prostheses exists, but functional adaptation requires further investigation.