Int J Med Robot - Accuracy of a hexapod parallel robot kinematics based external fixator.

Tópicos

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Resumo

CKGROUND: Different hexapod-based external fixators are increasingly used to treat bone deformities and fractures. Accuracy has not been measured sufficiently for all models.METHODS: An infrared tracking system was applied to measure positioning maneuvers with a motorized Precision Hexapod? fixator, detecting three-dimensional positions of reflective balls mounted in an L-arrangement on the fixator, simulating bone directions. By omitting one dimension of the coordinates, projections were simulated as if measured on standard radiographs. Accuracy was calculated as the absolute difference between targeted and measured positioning values.RESULTS: In 149 positioning maneuvers, the median values for positioning accuracy of translations and rotations (torsions/angulations) were below 0.3mm and 0.2? with quartiles ranging from -0.5mm to 0.5mm and -1.0? to 0.9?, respectively.CONCLUSIONS: The experimental setup was found to be precise and reliable. It can be applied to compare different hexapod-based fixators. Accuracy of the investigated hexapod system was high. Copyright ? 2014 John Wiley & Sons, Ltd.

Resumo Limpo

ckground differ hexapodbas extern fixat increas use treat bone deform fractur accuraci measur suffici modelsmethod infrar track system appli measur posit maneuv motor precis hexapod fixat detect threedimension posit reflect ball mount larrang fixat simul bone direct omit one dimens coordin project simul measur standard radiograph accuraci calcul absolut differ target measur posit valuesresult posit maneuv median valu posit accuraci translat rotat torsionsangul mm quartil rang mm mm respectivelyconclus experiment setup found precis reliabl can appli compar differ hexapodbas fixat accuraci investig hexapod system high copyright john wiley son ltd

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