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Research Papers

Influence of the Level of Muscular Redundancy on the Validity of a Musculoskeletal Model

[+] Author and Article Information
Florent Moissenet

CNRFR—Rehazenter,
Laboratoire d'Analyse du Mouvement
et de la Posture,
1 rue André Vésale,
L-2674, Luxembourg
e-mail: florent.moissenet@mailoo.org

Laurence Chèze

Université de Lyon,
Lyon F-69622, France;
Université Claude Bernard Lyon 1,
Villeurbanne, France;
IFSTTAR, UMR_T9406,
Laboratoire de Biomécanique
et Mécanique des Chocs,
Bron F-69675, France
e-mail: laurence.cheze@univ-lyon1.fr

Raphaël Dumas

Université de Lyon,
Lyon F-69622, France;
Université Claude Bernard Lyon 1,
Villeurbanne, France;
IFSTTAR, UMR_T9406,
Laboratoire de Biomécanique
et Mécanique des Chocs,
Bron F-69675, France
e-mail: raphael.dumas@ifsttar.fr

1Corresponding author.

Manuscript received October 14, 2015; final manuscript received November 26, 2015; published online January 27, 2016. Editor: Beth A. Winkelstein.

J Biomech Eng 138(2), 021019 (Jan 27, 2016) (6 pages) Paper No: BIO-15-1513; doi: 10.1115/1.4032127 History: Received October 14, 2015; Revised November 26, 2015

While recent literature has clearly demonstrated that an extensive personalization of the musculoskeletal models was necessary to reach high accuracy, several components of the generic models may be further investigated before defining subject-specific parameters. Among others, the choice in muscular geometry and thus the level of muscular redundancy in the model may have a noticeable influence on the predicted musculotendon and joint contact forces. In this context, the aim of this study was to investigate if the level of muscular redundancy can contribute or not to reduce inaccuracies in tibiofemoral contact forces predictions. For that, the dataset disseminated through the Sixth Grand Challenge Competition to Predict In Vivo Knee Loads was applied to a versatile 3D lower limb musculoskeletal model in which two muscular geometries (i.e., two different levels of muscular redundancy) were implemented. This dataset provides tibiofemoral implant measurements for both medial and lateral compartments and thus allows evaluation of the validity of the model predictions. The results suggest that an increase of the level of muscular redundancy corresponds to a better accuracy of total tibiofemoral contact force whatever the gait pattern investigated. However, the medial and lateral contact forces ratio and accuracy were not necessarily improved when increasing the level of muscular redundancy and may thus be attributed to other parameters such as the location of contact points. To conclude, the muscular geometry, among other components of the generic model, has a noticeable impact on joint contact forces predictions and may thus be correctly chosen even before trying to personalize the model.

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References

Figures

Grahic Jump Location
Fig. 1

Medial, lateral, and total tibiofemoral contact force predictions compared to implant measurements [19] for both Delp et al. [17] and Klein Horsman et al. [18] muscular geometries during normal gait pattern

Grahic Jump Location
Fig. 2

Medial, lateral, and total tibiofemoral contact forces predictions compared to implant measurements [19] for both Delp et al. [17] and Klein Horsman et al. [18] muscular geometries during bouncy gait pattern

Grahic Jump Location
Fig. 3

Medial, lateral, and total tibiofemoral contact force predictions compared to implant measurements [19] for both Delp et al. [17] and Klein Horsman et al. [18] muscular geometries during smooth gait pattern

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