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Rapport Année : 2022

The Detailed Model of the Middle Finger Extensor Mechanism for Understanding the Role of Intercrossing Fibers

Résumé

The extensor mechanism is a tendinous structure playing an important role in finger movement. It transmits the forces from several intrinsic and extrinsic muscles to multiple tendinous attachment points. The most important attachment points are located at the base of the second and third phalanx (proximal and distal attachments). The extrinsic muscle controls the force in proximal attachment by medial extensor mechanism band and intrinsic muscles control the force in distal attachment by lateral bands. Moreover, there exists two layers of intercrossing fibers, connecting medial band with the lateral ones. Intercrossing fibers transmits a fraction of the extrinsic muscle force to the proximal attachment and a fraction of the intrinsic muscle force to the distal one. In the current study, a numerical model of the extensor mechanism was built to analyze the role of intercrossing fibers in force transmission. The full extensor mechanism model containing the intercrossing fibers was compared with a trivial model, containing no connecting tissue between the medial and lateral bands. It was shown that the intercrossing fibers can play an important role in force transmission, modifying the force distribution among the extensor mechanism bands according to loading and posture. Influence of the intercrossing fiber parameters on force transmission was also demonstrated.
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Dates et versions

hal-03955693 , version 1 (25-01-2023)

Identifiants

  • HAL Id : hal-03955693 , version 1

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Anton Dogadov, Francisco Valero-Cuevas, Christine Serviere, Franck Quaine. The Detailed Model of the Middle Finger Extensor Mechanism for Understanding the Role of Intercrossing Fibers. GIPSA Lab. 2022. ⟨hal-03955693⟩
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