A marker registration method to improve joint angles computed by constrained inverse kinematics.
| Autor: | Dunne JJ; Departments of Mechanical Engineering and Bioengineering, Stanford University, Stanford, California, United States of America.; School of Sport Science, Exercise and Health, University of Western Australia, Crawley, Western Australia, Australia., Uchida TK; Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario, Canada., Besier TF; Department of Engineering Science, Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand., Delp SL; Departments of Mechanical Engineering and Bioengineering, Stanford University, Stanford, California, United States of America., Seth A; Department of Biomechanical Engineering, Delft University of Technology, Delft, The Netherlands. |
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| Jazyk: | angličtina |
| Zdroj: | PloS one [PLoS One] 2021 May 28; Vol. 16 (5), pp. e0252425. Date of Electronic Publication: 2021 May 28 (Print Publication: 2021). |
| DOI: | 10.1371/journal.pone.0252425 |
| Abstrakt: | Accurate computation of joint angles from optical marker data using inverse kinematics methods requires that the locations of markers on a model match the locations of experimental markers on participants. Marker registration is the process of positioning the model markers so that they match the locations of the experimental markers. Markers are typically registered using a graphical user interface (GUI), but this method is subjective and may introduce errors and uncertainty to the calculated joint angles and moments. In this investigation, we use OpenSim to isolate and quantify marker registration-based error from other sources of error by analyzing the gait of a bipedal humanoid robot for which segment geometry, mass properties, and joint angles are known. We then propose a marker registration method that is informed by the orientation of anatomical reference frames derived from surface-mounted optical markers as an alternative to user registration using a GUI. The proposed orientation registration method reduced the average root-mean-square error in both joint angles and joint moments by 67% compared to the user registration method, and eliminated variability among users. Our results show that a systematic method for marker registration that reduces subjective user input can make marker registration more accurate and repeatable. Competing Interests: The authors have declared that no competing interests exist. |
| Databáze: | MEDLINE |
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