Single sensor measurement of heel-height during the push-off phase of gait

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Bäcklund, Tomas,1958-Umeå universitet,Radiofysik (författare)

Single sensor measurement of heel-height during the push-off phase of gait

Artikel/kapitelEngelska2021

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2021-11-26
Institute of Physics (IOP),2021
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LIBRIS-ID:oai:DiVA.org:umu-182776
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-182776URI
https://doi.org/10.1088/1361-6579/ac325cDOI

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Språk:engelska
Sammanfattning på:engelska

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Previously included in thesis in manuscript form.
Objective: In healthy gait a forceful push-off is needed to get an efficient leg swing and propulsion, and a high heel lift makes a forceful push-off possible. The power of the push-off is decreased with increased age and in persons with impaired balance and gait. The aim of this study was to evaluate whether a wearable equipment (Striton) and algorithms to estimate vertical heel-height during gait from a single optical distance sensor is reliable and feasible for clinical applications.Approach: To assess heel-height with the Striton system an optical distance sensor was used to measure the distance to the floor along the shank. An algorithm was created to transform this measure to a vertical distance. The heel-height was validated in an experimental setup, against a 3D motion capture system (MCS), and test-retest and day-to-day tests were performed on 10 elderly persons. As a reference material 83 elderly persons were included, and heel-height was measured before and after surgery in four patients with the neurological disorder idiopathic normal pressure hydrocephalus (iNPH).Main results: In the experimental setup the accuracy was high with a maximum error of 2% at all distances, target colours and inclination angles, and the correlation to the MCS was R = 0.94. Test-retest and day-to-day tests were equal within ±1.2 cm. Mean heel-height of the elderly persons was 16.5 ± 0.6 cm and in the patients with iNPH heel-height was increased from 11.2 cm at baseline to 15.3 cm after surgery.Significance: Striton can reliably measure heel-height during gait, with low test-retest and day-to-day variability. The system was easy to attach, and simple to use, which makes it suitable for clinical applications.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Medicinteknik hsv//swe
ENGINEERING AND TECHNOLOGY Medical Engineering hsv//eng
heel-height
optical sensor
heel-height variability
push-off phase
medical informatics
medicinsk informatik

Biuppslag (personer, institutioner, konferenser, titlar ...)

Grip, HelenaUmeå universitet,Radiofysik(Swepub:umu)heagrp96 (författare)
Öhberg, Fredrik,1969-Umeå universitet,Radiofysik(Swepub:umu)froh0003 (författare)
Sundström, NinaUmeå universitet,Radiofysik(Swepub:umu)nian0004 (författare)
Umeå universitetRadiofysik (creator_code:org_t)

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Ingår i:Physiological Measurement: Institute of Physics (IOP)42:100967-33341361-6579

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Av författaren/redakt...: Bäcklund, Tomas, ...; Grip, Helena; Öhberg, Fredrik, ...; Sundström, Nina

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Medicinteknik

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Av lärosätet: Umeå universitet

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