Related Experiment Video
Updated: Jun 5, 2026
In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
Published on: July 2, 2021
The effect of pelvic movement on the accuracy of hip centre location acquired using an imageless navigation system
Sebastien Lustig1, Cyrille Fleury, Elvire Servien
1Service de chirurgie orthopédique, Centre Albert Trillat, Hôpital de la Croix Rousse, 103, Grande Rue de la Croix Rousse, 69004, Lyon, France. sebastien.lustig@chu-lyon.fr
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.
