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Updated: May 21, 2025

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

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Published on: February 10, 2014

Testing an adjustable prosthetic socket in a simulated military environment.

J C Mertens¹, C A Price^2,3, M E Baumann^2,4

¹Department of Bioengineering, University of Washington, Seattle, WA, USA.

Journal of Rehabilitation and Assistive Technologies Engineering

|May 19, 2025

Summary

This summary is machine-generated.

An automatically adjusting prosthetic socket improved fit for transtibial prosthesis users during military tasks. This advanced socket technology minimized errors in socket fit compared to static or manually adjusted options.

Keywords:

adjustable socket amputee control system limb-socket motion pistoning pressure prosthesis residual limb socket fit trans-tibial volume accommodation

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Area of Science:

Biomedical Engineering
Rehabilitation Engineering
Prosthetics and Orthotics

Background:

Transtibial prosthesis users often experience issues with socket fit, impacting comfort and performance.
Traditional prosthetic sockets can be static or manually adjusted, leading to suboptimal fit during dynamic activities.
Military personnel and veterans using prostheses require reliable and adaptable solutions for demanding tasks.

Purpose of the Study:

To evaluate the performance of a novel motor-driven adjustable socket for transtibial prosthesis users.
To compare the socket fit metric (SFM) and task performance across static, user-adjusted, and automatically adjusting socket modes.
To assess the impact of adjustable socket technology on military-relevant activities.

Main Methods:

Fabrication of investigational sockets with motor-driven adjustable panels and embedded sensors to measure liner-to-socket distance.
Quantification of socket fit using a socket fit metric (SFM).
Participants (11 Service members or Veterans) performed military readiness assessments under three socket volume adjustment conditions: static, user-adjusted (app-controlled), and auto-adjusted (controller-controlled).

Main Results:

The automatically adjusting socket mode demonstrated a significantly lower SFM distribution compared to user-adjusted and static modes.
Socket volume adjustments occurred more frequently and with a greater range in the auto mode versus the user-adjusted mode.
No significant differences were found in the change of socket comfort score (SCS) between the different adjustment modes.

Conclusions:

Automatically adjusting prosthetic sockets can significantly minimize errors in socket fit.
This technology offers a potential improvement for transtibial prosthesis users, particularly in dynamic and demanding scenarios.
The automatic adjustment system effectively maintained or improved socket fit without negatively impacting task performance.