University of Southern Mississippi
Validation of an Inertial-Measurement-Unit System for Calculating Hip and Knee Flexion Angles During Gait
Abstract
dc:description.abstract<p>Technological advances regarding Inertial Measurements Units (IMUs) have positioned this type of sensor as an alternative for camera-based motion capture. This study introduces a new IMU based system (IMU<sub>sys</sub>) to measure hip and knee flexion angles. PURPOSE: To validate the use of a five-sensor IMU<sub>sys</sub> for the measurement of knee and hip flexion angles during gait in adults and pediatrics at two different time points. METHODS: Bilateral hip and knee flexion patterns (LH, RH, LK, and RK) of twenty-two healthy participants (12 adults and 10 pediatric) between the ages of 8 – 35 years were investigated. Participants performed two 1-min gait trials on a treadmill at self-selected speeds at two different time points. Data were analyzed using linear regression coefficients, the root mean square error (RMSE), the mean absolute error (MAE), and Bland & Altman plots. RESULTS: A strong relationship (<em>r</em><sup>2</sup>> 0.94) between the IMU<sub>sys</sub> and the camera-based system was found across all condition. RMSEs [LH < 10°, RH < 10°, LK > 10°, RK > 10°] were found across all condition. Repeatability coefficients [LH ≤ 5°, RH ≤ 5°, LK > 10°, RK < 10°] were found across all condition. CONCLUSION: The validity of the IMU<sub>sys</sub> was maintained across age groups with different segment proportion, and during prolonged use. However, the large errors observed for knee flexion measurements should be considered when using the IMU<sub>sys</sub>.</p>
Degree
thesis:*- Name thesis:degree_name
- Master of Science (MS)
- Level thesis:degree_level
- Masters Thesis
- Year dc:date.available
- 2020
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Park, Joonsun
- Contributors dc:contributor
-
- Dr. Nuno Oliveira
- Dr. Paul Donahue
- Dr. Zhanxin Sha
Subjects
dc:subject × 11Identifiers
dc:identifier.*- Repository record dc:identifier
- https://aquila.usm.edu/masters_theses/790
- OAI identifier oai:identifier
- oai:aquila.usm.edu:masters_theses-1843