A morphological approach to the simulation of forearm motion

Abstract

Computer-based simulations support surgeons in preoperative planning of osteotomy and assessing the improvement of the forearm motion. To this end, an in-silico model of patient-specific forearm kinematics is required. In this paper we introduce a motion model of the forearm which is based on a patient's joint morphology, the form and shape of the joints. The morphology of the articulations is represented by 3-dimensional splines. In this way the gliding motion of the articulations is expressed analytically in a closed-form. Our algorithm was designed to work with available clinical planning data and requires minimal user interaction. This allows an integration in computer-aided planning systems that are operated by surgeons. The accuracy of the simulation results is verified via cadaver experiments. Abstract-Computer-based simulations support surgeons in preoperative planning of osteotomy and assessing the improvement of the forearm motion. To this end, an in-silico model of patient-specific forearm kinematics is required. In this paper we introduce a motion model of the forearm which is based on a patient's joint morphology, the form and shape of the joints. The morphology of the articulations is represented by 3-dimensional splines. In this way the gliding motion of the articulations is expressed analytically in a closed-form. Our algorithm was designed to work with available clinical planning data and requires minimal user interaction. This allows an integration in computer-aided planning systems that are operated by surgeons. The accuracy of the simulation results is verified via cadaver experiments. A Morphological Approach to the Simulation of Forearm Motion

Three-Dimensional Computed Tomographic Analysis of 11 Scaphoid Waist Nonunions

“…To obtain an exact quantification of that displacement, we exported all 3 fragments (the proximal fragment and the displaced and reduced distal fragments) as surface tessellation language files from Mimics and imported them using customized software, as previously described. 25,26 This software, which was originally developed to automatically find the best volumetric fit in forearm osteotomies, is able to calculate the 6 degrees of freedom (3 rotation and 3 translation) of the transposition in space of an object from a defined start position to a defined end position with reference to an arbitrary coordinate system. In our setup, the 3-dimensional model of the displaced distal scaphoid fragment was the start position and the reduced distal fragment (copy) was the end position.…”

Surgical Treatment of Long-Bone Deformities: 3D Preoperative Planning and Patient-Specific Instrumentation

“…Consequently, a successful clinical outcome cannot always be ensured by merely relying on the contralateral bone anatomy, even if the reduction is performed precisely as planned. The integration of a pre-and postoperative motion simulation into the preoperative planning application may be the next step to better predict the functional outcome [53] for soft tissue injuries. Apart from this, the resolution of the image data used for planning and the subsequent segmentation process are additional technical factors, which may also influence the planning accuracy.…”

Reconstruction of Malunited Diaphyseal Fractures of the Forearm

“…Pre-operative planning is essential in deformity correction surgery for malunited forearm fractures [4]. Early experience of computer-aided planning has been promising [17, 24, 28, 50]. It has been utilised for simulating pre- and post-operative motion and integrated into software for planning osteotomies in complex diaphyseal malunions with good functional results [17, 50].…”