Medinria dti software#

Until 2008, both computational and experimental studies focussed their efforts towards reducing the socket-stump interface pressure, which was considered to be the most critical factor in deciding the comfort of a prosthesis. This indicates that most fits are sub-optimal, and thereby impede the acceptance of prosthetic devices, affect gait, and may lead to pain and injury ( Klute et al., 2001 Van Velzen et al., 2005). However, studies indicate that prosthetic fit varies, not only from one prosthetist to another, but also within the same prosthetist ( Boone et al., 2012 Kobayashi et al., 2015). Those prosthetic devices that are perceived as good prosthetic fits provide the ability to walk comfortably, which should be as close as possible to normal gait, i.e., someone with a healthy residual limb ( Legro et al., 1999). When designing and fitting prosthetic devices, prosthetists try to cater to the unique needs and desires of a patient. The proposed approach is not only limited to modelling residual limbs but also has applications in predicting the impact of plastic surgery, for detailed forward-dynamics simulations of normal musculoskeletal systems. At the end of the bipedal stance analysis using the misfitted socket, the fused-muscle model predicted that 7.65% of the residual limb volume was injured, while the detailed-model predicted 16.03%. The peak interface stress in the individual-muscle model, at the end of bipedal stance analysis, was 2.63 times lower than that in the deep tissues of the stump. The results of the bipedal stance simulation showed that peak stresses in the fused-muscle model were four times lower when compared to the multi-muscle model. By analysing the potential volume of damaged muscle tissue after donning an optimally-fitted and a misfitted socket, i.e., a socket whose volume was isotropically shrunk by 10%, we were able to highlight the differences between the detailed individual- and fused-muscle models. To demonstrate the feasibility of the entire modelling-simulation-analysis workflow and the fact that detailed, anatomically realistic, multi-muscle models are superior to state-of-the-art, fused-muscle models, an implicit dynamic FE analysis of 2-h bipedal stance is carried out. For this purpose, a nonlinear hyperelastic, transversely isotropic skeletal muscle constitutive law containing a deep tissue injury model was implemented in LS-DYNA. Moreover, to complete the modelling-simulation-analysis workflow, the generated subject-specific residual limb model is used within an implicit dynamic FE simulation of bipedal stance to predict the potential sites of deep tissue injury.

Medinria dti software#

Herein, we propose a novel and efficient modelling-simulation-analysis workflow that uses commercial software for generating a detailed subject-specific, three-dimensional finite element model of an entire residual limb from Diffusion Tensor MRI images in <20 min. The lack of an efficient modelling-simulation-analysis workflow for creating and utilising detailed subject-specific computational models is one of the key reasons why simulation-based approaches for analysing socket-stump interaction have not yet been successfully established. 4Stuttgart Centre for Simulation Sciences, Universität Stuttgart, Stuttgart, Germany.3Institut für Mechanik (Bauwesen), Universität Stuttgart, Stuttgart, Germany.

2Diagnostische und Interventionelle Radiologie, Sektion für Experimentelle Radiologie, Department für Radiologie, Universitätsklinikum Tübingen, Tübingen, Germany.

1Department of Biomechatronic Systems, Fraunhofer-Institut für Produktionstechnik und Automatisierung (Fraunhofer IPA), Stuttgart, Germany.

Ellankavi Ramasamy 1, Okan Avci 1, Beate Dorow 1, Sook-Yee Chong 2, Leonardo Gizzi 3, Günter Steidle 2, Fritz Schick 2 and Oliver Röhrle 1,2,4 *