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Scientific article
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English

Three-Dimensional Lower-Limb Kinematics from Accelerometers and Gyroscopes with Simple and Minimal Functional Calibration Tasks: Validation on Asymptomatic Participants

Published inSensors, vol. 22, no. 15, 5657
Publication date2022-07-28
First online date2022-07-28
Abstract

The use of inertial measurement units (IMUs) to compute gait outputs, such as the 3D lower-limb kinematics is of huge potential, but no consensus on the procedures and algorithms exists. This study aimed at evaluating the validity of a 7-IMUs system against the optoelectronic system. Ten asymptomatic subjects were included. They wore IMUs on their feet, shanks, thighs and pelvis. The IMUs were embedded in clusters with reflective markers. Reference kinematics was computed from anatomical markers. Gait kinematics was obtained from accelerometer and gyroscope data after sensor orientation estimation and sensor-to-segment (S2S) calibration steps. The S2S calibration steps were also applied to the cluster data. IMU-based and cluster-based kinematics were compared to the reference through root mean square errors (RMSEs), centered RMSEs (after mean removal), correlation coefficients (CCs) and differences in amplitude. The mean RMSE and centered RMSE were, respectively, 7.5° and 4.0° for IMU-kinematics, and 7.9° and 3.8° for cluster-kinematics. Very good CCs were found in the sagittal plane for both IMUs and cluster-based kinematics at the hip, knee and ankle levels (CCs > 0.85). The overall mean amplitude difference was about 7°. These results reflected good accordance in our system with the reference, especially in the sagittal plane, but the presence of offsets requires caution for clinical use.

eng
Keywords
  • Inertial measurement units
  • Gait kinematics
  • Lower limbs
  • Tridimensional kinematics
  • Clinical gait analysis
Funding
  • Innosuisse—Swiss Innovation Agency (Bern, Switzerland) - KINEMAGICS: 3D kinematics for clinical gait analysis using wearable sensors [38215]
Citation (ISO format)
CARCREFF, Léna et al. Three-Dimensional Lower-Limb Kinematics from Accelerometers and Gyroscopes with Simple and Minimal Functional Calibration Tasks: Validation on Asymptomatic Participants. In: Sensors, 2022, vol. 22, n° 15, p. 5657. doi: 10.3390/s22155657
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Identifiers
ISSN of the journal1424-8220
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Technical informations

Creation08/03/2022 9:19:00 AM
First validation08/03/2022 9:19:00 AM
Update time03/16/2023 8:43:49 AM
Status update03/16/2023 8:43:47 AM
Last indexation05/06/2024 11:55:22 AM
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