Perspectives on the comparative benefits of body-powered and myoelectric upper limb prostheses.
Susannah M Engdahl, Michael A Gonzalez, Christina Lee and 1 others
PMID 39118106WHAT IT FOUND
Body-powered and myoelectric prostheses showed no consistent functional advantage.
Performance depended more on the specific task and individual factors like cause of limb loss than device type. Prescription should focus on patient needs rather than assuming one design is superior.
Key findings
01Body-powered users could use force feedback to identify object stiffness, whereas myoelectric users performed near chance without visual cues.
02There was no significant difference in prosthesis embodiment between body-powered and myoelectric users; variability was driven by cause of limb loss.
03Movement quality and compensatory patterns differed inconsistently between devices, with neither offering an absolute advantage across tasks.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Very small sample size (n=9) limits generalizability and statistical power. Results are descriptive and lack rigorous statistical comparison for many sub-analyses. Participants had varying durations of prosthesis ownership and experience, which may confound performance. Only direct control myoelectric systems were tested; pattern recognition systems were not included. The commentary summarizes previously published work and does not present new primary data.
Declared interests
Research Support, U.S. Gov't, Non-P.H.S.
The easy way to misread this
Do not interpret the lack of significant differences as proof that body-powered and myoelectric prostheses are functionally identical. The study was underpowered to detect subtle differences, and individual variability was high. Clinical decisions should be based on patient-specific factors and trial outcomes, not on a blanket assumption of equivalence.