Clinical Gait Analysis and Musculoskeletal Modeling

Tecante, Karelia; Seehaus, Frank; Welke, Bastian; Olender, Gavin; Schwarze, Michael; Lynch, Sean; Hurschler, Christof

doi:10.1007/978-1-4471-6275-9_7

Cited by 2 publications

(1 citation statement)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4 In both fields, obtained kinetic and kinematic data is frequently used as input data for musculoskeletal simulations of the studied movements and events. [4][5][6] There are various approaches and methods to motion tracking depending on applications. A systematic review of most of the systems was presented by van der Kruk and Reijne.…”

Section: Introductionmentioning

confidence: 99%

Comparison of three methods for reconstructing 3D motion from 2D video recordings for low cost gait analysis systems

Cygan

Specyalska

2021

Polish Journal of Medical Physics and Engineering

View full text Add to dashboard Cite

Purpose: The aim of this study was to quantify the accuracy of 3D trajectory reconstructions performed from two planar video recordings, using three different reconstruction methods. Additionally, the recordings were carried out using easily available equipment, like built-in cellphone cameras, making the methods suitable for low-cost applications. Methods: A setup for 3D motion tracking was constructed and used to acquire 2D video recordings subsequently used to reconstruct the 3D trajectories by 1) merging appropriate coordinates, 2) merging coordinates with proportional scaling, and 3) calculating the 3D position based on markers’ projections on the viewing plane. As experimental verification, two markers moving at a fixed distance of 98.9 cm were used to assess the consistency of results. Next, gait analysis in five volunteers was carried out to quantify the differences resulting from different reconstruction methods. Results: Quantitative evaluation of the investigated 3D trajectories reconstruction methods showed significant differences between those methods, with the worst reconstruction approach resulting in a maximum error of 50% (standard deviation 13%), while the best resulting in a maximum error of 1% (standard deviation 0.44%). The gait analysis results showed differences in mean angles obtained with each reconstruction method reaching only 2°, which can be attributed to the limited measurement volume. Conclusions: Reconstructing 3D trajectory from 2D views without accounting for the “perspective error” results in significant reconstruction errors. The third method described in this study enables a significant reduction of this issue. Combined with the proposed setup, it provides a functional, low-cost gait analysis system.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparison of three methods for reconstructing 3D motion from 2D video recordings for low cost gait analysis systems

Cygan

Specyalska

2021

Polish Journal of Medical Physics and Engineering

View full text Add to dashboard Cite

show abstract

A Proof of Concept Study of the Mechanical Behavior of Lattice Structures Used to Design a Shoulder Hemi-Prosthesis

Peto

Aguilar-Rosas

Ramírez-Cedillo

et al. 2021

Journal of Engineering and Science in Medical Diagnostics and Therapy

View full text Add to dashboard Cite

Lattice structures offer great benefits when employed in medical implants for cell attachment and growth (osseointegration), minimization of stress shielding phenomena, and weight reduction. This study is focused on a proof of concept for developing a generic shoulder hemi-prosthesis, from a patient-specific case of a 46 years old male with a tumor on the upper part of his humerus. A personalized biomodel was designed and a lattice structure was integrated in its middle portion, to lighten weight without affecting humerus’ mechanical response. To select the most appropriate lattice structure, three different configurations were initially tested: Tetrahedral Vertex Centroid (TVC), Hexagonal Prism Vertex Centroid (HPVC), and Cubic Diamond (CD). They were fabricated in resin by digital light processing and its mechanical behavior was studied via compression testing and finite element modeling (FEM). The selected structure according to the results was the HPVC, which was integrated in a digital twin of the biomodel to validate its mechanical performance through FEM but substituting the bone material model with a biocompatible titanium alloy (Ti6Al4V) suitable for prostheses fabrication. Results of the simulation showed acceptable levels of Von Mises stresses (325 MPa max.), below the elastic limit of the titanium alloys, and a better response (52 MPa max.) in a model with equivalent elastic properties, with stress performance in the same order of magnitude than the showed in bone’s material model.

show abstract

Clinical Gait Analysis and Musculoskeletal Modeling

Cited by 2 publications

References 65 publications

Comparison of three methods for reconstructing 3D motion from 2D video recordings for low cost gait analysis systems

Comparison of three methods for reconstructing 3D motion from 2D video recordings for low cost gait analysis systems

A Proof of Concept Study of the Mechanical Behavior of Lattice Structures Used to Design a Shoulder Hemi-Prosthesis

Contact Info

Product

Resources

About