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The AERO prosthetic liner: socket pressure distribution, comfort and material composition
Yusuke Miyata1, Kazuhiko Sasaki1, Gary Guerra2
1Sirindhorn School of Prosthetics and Orthotics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
Annals of Medicine
|July 26, 2024
Summary
The AERO liner significantly improved pressure distribution and comfort for transtibial prosthesis users compared to traditional liners. This affordable ethyl-vinyl acetate (EVA) option offers a better solution for prosthetic socket comfort.
Area of Science:
- Biomedical Engineering
- Prosthetics and Orthotics
- Materials Science
Background:
- Transtibial prosthesis users often experience discomfort due to pressure distribution issues with traditional liners.
- Ethyl-vinyl acetate (EVA) based liners offer a potential low-cost alternative for improving prosthetic socket comfort and fit.
Purpose of the Study:
- To evaluate the pressure distribution and comfort of transtibial prosthesis users utilizing an affordable ethyl-vinyl acetate (EVA) roll-on (AERO) liner.
- To compare the performance of the AERO liner with traditional polyethylene foam (PE-lite) liners.
Main Methods:
- Fifteen unilateral transtibial prosthesis users participated, initially using PE-lite liners in patella tendon bearing (PTB) sockets.
- Six force sensors measured pressure distribution during treadmill walking; Socket Comfort Score (SCS) assessed comfort.
- Fourier transform infrared (FT-IR) spectroscopy analyzed the material composition of both EVA and PE-lite liners.
Main Results:
- The AERO liner demonstrated significantly improved pressure distribution (CV: 83.3 ± 4.1) compared to PE-lite (CV: 75.7 ± 6.0).
- Residual limb pressure was significantly reduced with the AERO liner (p = .0007, r = 0.87).
- Mean SCS was higher for the AERO liner (8.9 ± 1.1) versus PE-lite (7.5 ± 1.3), indicating greater comfort.
Conclusions:
- The AERO liner provides superior pressure distribution and comfort for transtibial prosthesis users.
- The material composition of the AERO liner, with a higher proportion of calcium carbonate (CaCO3), contributes to its improved performance.
- The AERO liner presents a viable and effective off-the-shelf solution for enhancing comfort in traditional prosthetic sockets.
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