Modeling the Index Finger Extensor Hood Mechanism

finite element model Unfortunately, this control is likely to be compromised following stroke. We are trying to determine the changes that occur after stroke and how these alterations produce chronic deficits in hand function. The finger extensor apparatus is an elaborate structure that integrates multiple tendon forces to generate movements or exert fingertip forces. We are developing a dynamic, 3D model of the index finger using cadaver extremities in order to elucidate the function of each tendon within the extensor mechanism in the cadaveric experimental setup.


    We utilize different means to quantify the effects of the tendon force application within the extensor mechanism: the resultant fingertip forces and moments are measured by a 6 degree-of-freedom load cell, whereas the strain distribution within the extensor apparatus is estimated by a three-dimensional motion capture systGrasp em. Obtained experimental data are utilized to develop the model of effective moment arm of each tendon, which quantifies the contribution of the tendon force to joint moments, as well as the finite element model of the extensor apparatus that can precisely describes its tendon force distribution characteristics.

Experimental Setup

experimental setup