References of "Remy-Neris, Olivier"
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See detailUsing merged kinematic and anatomical data to evaluate humeral motion estimation: a pilot study
Schwartz, Cédric ULg; Leboeuf, Fabien; Rémy-Néris, Olivier et al

in Computer Methods in Biomechanics and Biomedical Engineering. Imaging & Visualization (2013)

Optoelectronic systems are widely used in 3D motion capture. However, the reliability of the motion estimation depends on soft tissue artifacts and should therefore be validated. Two different sets of ... [more ▼]

Optoelectronic systems are widely used in 3D motion capture. However, the reliability of the motion estimation depends on soft tissue artifacts and should therefore be validated. Two different sets of humeral markers were studied on four subjects. Anatomical and kinematic measurements were combined and the plausibility of the relative position of the bones in the glenohumeral joint during motion was evaluated using a new coherence index. Our findings show that an identical protocol leads to a large variability of the articular coherence for the subjects. However the use of an extra marker on the distal part of the humerus improves the humeral kinematics for three of the four subjects. Scientists and clinicians using 3D systems should remain aware of the influence of subject-specific morphology on the accuracy of the measure. Differences with a reference group may come from clinical reasons but also from measurement errors due to the inter-individual morphological differences. [less ▲]

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See detailDetection of incoherent joint state due to inaccurate bone motion estimation
Schwartz, Cédric ULg; Leboeuf, Fabien; Rémy-Néris, Olivier et al

in Computer Methods in Biomechanics & Biomedical Engineering (2011)

In biomechanical modeling and motion analysis, the use of personalized data such as bone geometry would provide more accurate and reliable results. However, there is still a limited number of tools used ... [more ▼]

In biomechanical modeling and motion analysis, the use of personalized data such as bone geometry would provide more accurate and reliable results. However, there is still a limited number of tools used to measure the evolution of articular interactions. This paper proposes a coherence index to describe the articular status of contact surfaces during motion. The index relies on a robust estimation of the evolution of surfacic interactions between the joint surfaces. The index is first compared to distance maps on simulated motions. It is then used to compare two motion capture protocols (two different localizations of the markers for scapula tracking). The results show that the index detects progressive modifications in the joint and allows to distinguish the two protocols, in accordance with the literature. In the future, the index could, among other things, be used to compare / improve biomechanical models and motion analysis protocols. [less ▲]

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See detailLocation of the best confident scapula cluster during a forward humeral elevation
Leboeuf, Fabien; Brochard, Sylvain; Lempereur, M. et al

Poster (2011, July)

Eleven subjects were equipped with a cluster of 120 markers on the scapula. Forward humeral elevation was then performed. Robust estimators are used in order to eliminate high deformation. Results ... [more ▼]

Eleven subjects were equipped with a cluster of 120 markers on the scapula. Forward humeral elevation was then performed. Robust estimators are used in order to eliminate high deformation. Results underline the modification of the best cluster during elevation. Markers located on the lateral posterior part of the acromion were identified. They could be the best ones to measure dynamic scapula rotation during entire elevation. [less ▲]

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See detailBuilding and tracking root shapes.
Jacq, Jean-Jose; Schwartz, Cédric ULg; Burdin, Valerie et al

in IEEE Transactions on Biomedical Engineering (2010), 57(3), 696-707

An algorithm aiming at robust and simultaneous registrations of a sequence of 3-D shapes was recently presented by Jacq et al. [IEEE Trans. Biomed. Eng., vol. 55, no. 5, 2008]. This algorithm has to carry ... [more ▼]

An algorithm aiming at robust and simultaneous registrations of a sequence of 3-D shapes was recently presented by Jacq et al. [IEEE Trans. Biomed. Eng., vol. 55, no. 5, 2008]. This algorithm has to carry out an implicit representation of their common root shape (RS). A particular emphasis was put on the median consensus shape, which is a specific type of RS. Unlike this previous study, mainly focusing on the algorithm foundations while dealing with very specific applications examples, this paper attempts to show the versatility of the RS concept through a set of three problems involving a wider scope of application. The first problem copes with the design of prosthetic cortical plates for the hip joint. It shows how an explicit reconstruction of the RS, coming with its consensus map, could bring out an intermediary anatomical support from which pragmatic choices could be made, thereby performing a tradeoff between morphological, surgical, and production considerations. The second problem addresses in vivo real-time shoulder biomechanics through a miniature 3-D video camera. This new protocol implicitly operates through RS tracking of the content of virtual spotlights. It is shown that the current medical-oriented protocol, while operating within expert offices through low-cost equipments, could challenge high-end professional equipments despite some limitations of the 3-D video cameras currently available. The last problem deals with respiratory motions. This is an auxiliary measurement required by some medical imaging systems that can be handled as a basic application case of the former new protocol. [less ▲]

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See detailEvaluation of elbow biomechanical models using data fusion: Application to elbow flexion
Leboucher, Julien; Schwartz, Cédric ULg; Brochard, Sylvain et al

in Gait & Posture (2009), 30(2009), 60-61

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See detailMéthode d'analyse du mouvement de l'épaule par utilisation de nappes
Schwartz, Cédric ULg; Lempereur, Mathieu; Burdin, Valérie et al

Poster (2006)

Nous proposons une méthode permettant d’étudier le mouvement des structures osseuses du complexe de l'épaule (humérus, omoplate, clavicule). Cette méthode est basée sur le suivi de nappes de marqueurs ... [more ▼]

Nous proposons une méthode permettant d’étudier le mouvement des structures osseuses du complexe de l'épaule (humérus, omoplate, clavicule). Cette méthode est basée sur le suivi de nappes de marqueurs plutôt qu'un ensemble de marqueurs individuels à l'aide d'un système de caméras VICON. Le suivi du mouvement des nappes par un algorithme de recalage robuste doit permettre de s'affranchir du mouvement de la peau et avoir accès aux mouvements des structures osseuses sous-jacentes. Cette méthode est comparée à une méthode standard de la littérature. Les résultats montrent que le mouvement de l’omoplate est sous estimé ou sur estimé suivant les axes de rotation. [less ▲]

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