Journal ArticleDOI
Surface-marker cluster design criteria for 3-D bone movement reconstruction
TLDR
This paper deals with the identification of the optimal cluster position and orientation on the limb aimed at the minimization of error propagation to anatomical landmark laboratory coordinates.Abstract:
When three-dimensional (3-D) human or animal movement is recorded using a photogrammetric system, bone-embedded frame positions and orientations are estimated from reconstructed surface marker trajectories using either nonoptimal or optimal algorithms. The effectiveness of these mathematical procedures in accommodating for both photogrammetric errors and skin movement artifacts depends on the number of markers associated with a given bone as well as on the size and shape characteristics of the relevant cluster. One objective of this paper deals with the identification of marker cluster design criteria aimed at the minimization of error propagation from marker coordinates to bone-embedded frame position and orientation. Findings allow for the quantitative estimation of these errors for any given cluster configuration and suggest the following main design criteria. A cluster made up of four markers represents a good practical compromise. Planar clusters are acceptable, provided in quasi-isotropic distribution. The root mean square distance of the markers from their centroid should be greater than ten times the standard deviation of the marker position error. The second objective of this paper deals with the identification of the optimal cluster position and orientation on the limb aimed at the minimization of error propagation to anatomical landmark laboratory coordinates. Cluster position should be selected to minimize skin movement artifacts. The longest principal axis of the marker distribution should be oriented toward the relevant anatomical landmark position.read more
Citations
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Journal ArticleDOI
Human movement analysis using stereophotogrammetry. Part 1: theoretical background.
TL;DR: An effort to systematize the different theoretical and experimental approaches to the problems involved and related nomenclatures is needed to facilitate data and knowledge sharing, and to provide renewed momentum for the advancement of human movement analysis.
Journal ArticleDOI
Abnormal Rotational Knee Motion During Running After Anterior Cruciate Ligament Reconstruction
TL;DR: Anterior cruciate ligament reconstruction failed to restore normal rotational knee kinematics during dynamic loading, and these abnormal motions may contribute to long-term joint degeneration associated with anterior cruciated ligament injury/reconstruction.
Journal ArticleDOI
Human movement analysis using stereophotogrammetry. Part 2: instrumental errors.
TL;DR: Since the desired outcome of the movement measurements is a reliable estimate of body segment kinematics, state-of-the-art techniques proposed for minimization of error propagation arising from a cluster of external markers are described.
Journal ArticleDOI
Wearable soft sensing suit for human gait measurement
Yigit Menguc,Yong-Lae Park,Hao Pei,Daniel M. Vogt,Patrick M. Aubin,Ethan Winchell,Lowell Fluke,Leia Stirling,Robert J. Wood,Conor J. Walsh +9 more
TL;DR: The design and systematic characterization of a soft sensing suit for monitoring hip, knee, and ankle sagittal plane joint angles is presented and it is anticipated that wearable soft sensing will also have applications beyond wearable robotics, such as in medical diagnostics and in human–computer interaction.
Journal ArticleDOI
Dynamic function of the ACL-reconstructed knee during running.
TL;DR: Anterior cruciate ligament reconstruction failed to restore normal rotational knee kinematics during dynamic, functional loading and some degradation of graft function occurred over time, which may contribute to long-term joint degeneration associated with ACL injury and reconstruction.
References
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