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The effect of pelvic movement on the accuracy of hip centre location acquired using an imageless navigation system

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Abstract

Objective

The aim of this study was to assess the accuracy of an imageless navigation system in localising the hip centre and to evaluate the effect of pelvic movement on the accuracy of hip centre acquisition.

Material and methods

A phantom leg was constructed to simulate the hip joint and upper femur. A 3D measurement device was used to measure precisely the co-ordinates of hip centre. A limber link simulated hip motion as used when defining the hip centre during computer-assisted surgery. The data generated by the 3D measurement device and the image-free navigation system was compared with increasing amounts of simulated pelvic movement.

Results

For moderate pelvic movement (5 mm) the mean error of the hip centre ranged between 1.5 mm and 3.9 mm with a corresponding angular error of between 0.25° and 0.64°. In conditions of excessive pelvic movement (15 mm) the mean error was 11.7 mm corresponding to an angular error of 1.9°.

Conclusion

This in vitro study showed accurate acquisition of the centre of hip with a surgical navigation system. These data suggest that during TKA using this computer assisted navigation system, the accuracy of insertion will not be significantly affected by moderate pelvic movement during data acquisition.

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Acknowledgements

The authors would like to thank Damien Goy, Regis Capellaro and Frederic Marcelli for their help during experimentation.

Conflict of interest statement

All of the authors have received benefits from a commercial organisation (Tornier®) related to this study.

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Correspondence to Sebastien Lustig.

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Lustig, S., Fleury, C., Servien, E. et al. The effect of pelvic movement on the accuracy of hip centre location acquired using an imageless navigation system. International Orthopaedics (SICOT) 35, 1605–1610 (2011). https://doi.org/10.1007/s00264-010-1194-2

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  • DOI: https://doi.org/10.1007/s00264-010-1194-2

Keywords

Navigation