Calibration and validation of 6 DOFs instrumented spatial linkage for biomechanical applications. A practical approach.
A method for both calibration and validation of a 6 DOF electrogoniometer is presented. A 6 Revolute Instrumented Spatial Linkage (6R-ISL) and a three-dimensional digitizer (3DD) were used simultaneously to collect both static and continuous poses of unconstrained or constrained motions. Validation occurred using a calibrated ball-and-socket joint. A parametrical model of the 6R-ISL (i.e. Virtual Goniometer or VG) was designed using a standard multibody system geometry. Two approaches were used to adjust the VG parameters: a parametrical adjustment of the VG linkage geometry, and a functional adjustment of the potentiometer calibration curves (angle-voltage) in a predefined range of motion. After calibration, 6R-ISL accuracy was better than 1 mm and 1 degrees for translation and orientation, respectively. The functional method presented in this paper can be suggested as a practical approach, which allows on-line checking and calibration of 6R-ISL within the specific range of interest of a particular anatomical joint. In addition, improving the potentiometer calibration curves was less time consuming than the parametrical adjustment.
Department of Anatomy (CP 619), University of Brussels, Lennik Street 808, 1070 Brussels, Belgium.
Victor
V
Sholukha
Patrick
P
Salvia
Isam
I
Hilal
Véronique
V
Feipel
Marcel
M
Rooze
Serge Van Sint
SV
Jan
D000465:Algorithms; D001696:Biomechanical Phenomena / Q000379:methods*; D001698:Biomedical Engineering / Q000379:methods*; D002138:Calibration; D003198:Computer Simulation; D004867:Equipment Design; D006801:Humans; D021621:Imaging, Three-Dimensional; D007596:Joints / Q000473:pathology; D016014:Linear Models; D015233:Models, Statistical; D008962:Models, Theoretical; D011199:Potentiometry; D016059:Range of Motion, Articular