Single sensor measurement of heel-height during the push-off phase of gait
| Autor: | Fredrik Öhberg, Helena Grip, Tomas Bäcklund, Nina Sundström |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_specialty
Heel Physiology Computer science Medical Engineering Biomedical Engineering Biophysics Phase (waves) Walking Motion capture heel-height push-off phase Gait (human) Physical medicine and rehabilitation Physiology (medical) medicine Humans heel-height variability optical sensor Gait Medicinteknik Aged Leg Lift (data mining) Swing Biomechanical Phenomena body regions medicine.anatomical_structure Push off (Idiopathic) normal pressure hydrocephalus Algorithms |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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