Accuracy of a hexapod parallel robot kinematics based external fixator

Maximilian Faschingbauer*, Hinrich J D Heuer, Klaus Seide, Robert Wendlandt, Matthias Münch, Christian Jürgens, Rainer Kirchner

*Corresponding author for this work
2 Citations (Scopus)


Background: 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

Original languageEnglish
JournalInternational Journal of Medical Robotics and Computer Assisted Surgery
Issue number4
Pages (from-to)424-435
Number of pages12
Publication statusPublished - 01.12.2015


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