With the number of shoulder arthroplasty procedures reaching well into the thousands in the United States every year, there is a need for tools that can reliably and consistently measure three-dimensional in-vivo skeletal motion in patients with joint implants. Bi-planar videoradiography may provide a solution to common problems encountered when quantify in-vivo joint kinematics. Directly tracking bone motion with the use of x-ray imaging avoids the limitations inherent in conventional optical motion capture systems, which have skin-based marker sets that can cause soft tissue artifact and lead to inaccuracies. One cadaveric humerus bone with implant was attached to a custom designed pendulum and jig and studied using the W.M. Keck XROMM Facility’s bi-planar videoradiography system. Marker-less tracking was performed using the semi-automated tracking algorithms of the Autoscoper software. Marker-based tracking was performed using implanted tantalum beads and the custom Matlab program XrayProjects. A Qualisys Optical Motion Capture system utilizing infrared cameras and reflective beads served as the independent gold standard for error evaluation. For marker-less tracking, translation data was accurate within 0.2 mm, and rotation data was accurate within 0.8 degrees. For marker-based tracking, translation data was accurate within 0.2 mm, and rotation data was accurate within 0.7 degrees. Error values are in close agreement with the results of previous studies [1]. The data presented supports the use of bi-planar videoradiography for studying the kinematics of the shoulder joint in shoulder arthroplasty patients. Further research will employ bi-planar videoradiography to track in-vivo joint motion in human subjects.
Stylianou, Alexia,
"Bi-planar videoradiography for tracking post-arthroplasty shoulder joint motion"
(2014).
Summer Research Symposium.
Brown Digital Repository. Brown University Library.
https://doi.org/10.26300/2sjv-m061
Each year, Brown University showcases the research of its undergraduates at the Summer Research Symposium. More than half of the student-researchers are UTRA recipients, while others receive funding from a variety of Brown-administered and national programs and fellowships and go …
