Comput Methods Programs Biomed - HiL simulation in biomechanics: a new approach for testing total joint replacements.

Tópicos

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Resumo

Instability of artificial joints is still one of the most prevalent reasons for revision surgery caused by various influencing factors. In order to investigate instability mechanisms such as dislocation under reproducible, physiologically realistic boundary conditions, a novel test approach is introduced by means of a hardware-in-the-loop (HiL) simulation involving a highly flexible mechatronic test system. In this work, the underlying concept and implementation of all required units is presented enabling comparable investigations of different total hip and knee replacements, respectively. The HiL joint simulator consists of two units: a physical setup composed of a six-axes industrial robot and a numerical multibody model running in real-time. Within the multibody model, the anatomical environment of the considered joint is represented such that the soft tissue response is accounted for during an instability event. Hence, the robot loads and moves the real implant components according to the information provided by the multibody model while transferring back the position and resisting moment recorded. Functionality of the simulator is proved by testing the underlying control principles, and verified by reproducing the dislocation process of a standard total hip replacement. HiL simulations provide a new biomechanical testing tool for analyzing different joint replacement systems with respect to their instability behavior under realistic movements and physiological load conditions.

Resumo Limpo

instabl artifici joint still one preval reason revis surgeri caus various influenc factor order investig instabl mechan disloc reproduc physiolog realist boundari condit novel test approach introduc mean hardwareintheloop hil simul involv high flexibl mechatron test system work under concept implement requir unit present enabl compar investig differ total hip knee replac respect hil joint simul consist two unit physic setup compos sixax industri robot numer multibodi model run realtim within multibodi model anatom environ consid joint repres soft tissu respons account instabl event henc robot load move real implant compon accord inform provid multibodi model transfer back posit resist moment record function simul prove test under control principl verifi reproduc disloc process standard total hip replac hil simul provid new biomechan test tool analyz differ joint replac system respect instabl behavior realist movement physiolog load condit

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