Líf - og heilbrigðisvísindaráðstefna Háskóla Íslands 2021

Objective measures of performance with implications to inform the iterative design process of prosthetic feet

Main author: Oliver John Daliet IV
Institution or Company: University of Iceland, Össur

Introduction: Classical methods for biomechanical analysis of lower limb prosthesis struggle to identify meaningful differences between various components, even if a clear preference is exhibited from users. Therefore, the aim of this project is to create a standardized testing protocol to evaluate the functionality and usability of a prosthetic foot prototype during user testing.

Methods: Prosthesis users were recruited to participate in a data collection using wireless insoles with imbedded force, pressure, accelerometer and angular rate sensors. Three different models of feet were tested. Information regarding the alignment of each foot were recording using a static alignment tool. User feedback and biomechanical data were recorded as participants completed a range of daily tasks and functional assessments including stair ascension and descension and variable speed walking.

Results: Preliminary analysis of the data shows some consistency between user feedback and biomechanical metrics of gait performance, particularly with respect to foot range of motion and stiffness. Furthermore, users generally preferred alignment settings that caused the load line of the residual limb to originate more medially on the foot than the intact limb.

Conclusion: By supplementing user feedback with objective measures of performance, a more wholistic analysis of prosthetic foot functionality can be obtained, which may provide useful information for the design of future iterations.

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