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Evaluation of EMG pattern recognition for upper limb prosthesis control: a case study in comparison with direct
Linda Resnik1,2, He Helen Huang3,4,5, Anna Winslow6,7
1Health Services, Policy and Practice, School of Public Health, Brown University, 121 South Main Street, Providence, RI, 02908, USA. Linda_Resnik@Brown.edu.
Journal of Neuroengineering and Rehabilitation
|March 17, 2018
Summary
Electromyogram (EMG) pattern recognition (PR) and direct myoelectric control (DC) for upper limb prostheses showed similar outcomes, though DC slightly favored in some measures. Dexterity declined one week post-training, indicating a need for further research on PR benefits.
Area of Science:
- Biomedical Engineering
- Rehabilitation Science
- Prosthetics and Orthotics
Background:
- Electromyogram (EMG) pattern recognition (PR) for upper limb prosthesis control is established, but clinical benefits remain under-examined.
- Previous research has focused on PR control, with limited studies evaluating its real-world clinical impact compared to direct control (DC).
Purpose of the Study:
- To compare self-report and performance outcomes of transradial amputees using direct myoelectric control (DC) versus EMG pattern recognition (PR) for a two-degree-of-freedom (DOF) prosthesis.
- To evaluate changes in outcomes one week after PR training and assess the rate of skill acquisition in two transradial amputees.
Main Methods:
- A cross-over study design randomized two transradial amputees (current 1-DOF myoelectric users) to receive either PR or DC training for a 2-DOF prosthesis.
- Outcomes measured included dexterity (with/without cognitive load), activity performance, self-reported function, and prosthetic satisfaction, assessed immediately and one week post-training.
- Skill acquisition speed was monitored hourly; one subject completed both PR and DC training, while both completed PR training and testing.
Main Results:
- In a single subject crossover, DC showed superior performance in 26% of dexterity and self-report measures compared to PR; other metrics were comparable.
- Both participants demonstrated a decline in dexterity one week after completing PR training.
- The rate of skill acquisition varied significantly between the two subjects.
Conclusions:
- Outcomes for PR and DC control of a 2-DOF prosthesis were largely similar, with a slight advantage for DC in specific metrics.
- A decline in dexterity was observed one week after training cessation, highlighting potential challenges in sustained prosthetic skill.
- Further research is needed to quantify the functional and clinical advantages of EMG pattern recognition control for upper limb prostheses.
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