Agreement between inertial measurement unit and optoelectronic system to measure postural sway

Article type: Brief Report

Authors: Vagnini, Alessandro^a | Furone, Roberta^a | Zanotti, Giulia^b | Adamo, Paola^b | Temporiti, Federico^{b; c} | Gatti, Roberto^{b; c; *}

Affiliations: [a] BTS S.p.A., Milan, Italy | [b] Physiotherapy Unit, Humanitas Clinical and Research Center – IRCCS Rozzano, Milan, Italy | [c] Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milan, Italy

Correspondence: [*] Corresponding author: Roberto Gatti, Physiotherapy Unit, Humanitas Clinical and Research Center and Humanitas University, Via Manzoni 56, 20089 Rozzano, Milan, Italy. Tel.: +39 282245610; E-mail: roberto.gatti@hunimed.eu.

Abstract: BACKGROUND: Optoelectronic systems and force platforms represent the gold standard for postural sway assessment, but pose disadvantages in terms of equipment, cost and preparation time. OBJECTIVE: Wearable inertial measurement units (IMUs) have been proposed to overcome these issues, but have never been compared to an optoelectronic system. The study aim was therefore to investigate agreement between inertial measurement unit and optoelectronic system in postural sway assessment. METHODS: Thirty healthy volunteers performed four balance tasks. IMU was placed on the sacrum (S2) with a retroreflective marker over the sensor and subjects’ performance was simultaneously recorded by both systems. Total (TOT), anterior-posterior (AP) and medial-lateral (ML) length of trace, range, speed, root mean squared (RMS), and confidence ellipse were computed. RESULTS: ICCs revealed excellent correlations for Length-TOT, Length-AP and Speed-AP, good correlation for Length-ML, Speed-ML, Confidence Ellipse, Range-AP and RMS-AP, and moderate correlation for range-ML and RMS-ML. Bland-Altman plot showed greater estimation for Length-TOT, Length-AP, Speed-AP, confidence ellipse and RMS-AP using optoelectronic system, and for Length-ML, Range-AP, Range-ML, Speed-ML, RMS-ML using IMU. Both systems revealed the same differences among tasks. CONCLUSION: The excellent to good agreement of IMU for length of trace and speed parameters and its user-friendly application suggest its potential implementations in clinical practice.

Keywords: Optoelectronic system, Inertial Measurement Unit, postural sway

DOI: 10.3233/THC-212924

Journal: Technology and Health Care, vol. 30, no. 3, pp. 757-762, 2022