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The effect of patient positioning on the precision of model-based radiostereometric analysis
Trevor C Gascoyne1, Jason B Morrison2, Thomas R Turgeon3
1Department of Biosystems Engineering, University of Manitoba, Winnipeg, MB, Canada; Concordia Joint Replacement Group, Concordia Hip and Knee Institute, Winnipeg, MB, Canada.
Abstract:
A repeatable method for in vivo and in vitro measurement of polyethylene wear in total knee replacement (TKA) is needed. This research examines the model-based radiostereometric analysis' (MBRSA) in vitro precision under different patient-radiograph orientations and flexion angles of the knee using a TKA phantom. Anterior-posterior and medial-lateral imaging orientations showed the highest precision; better than 0.036mm (3-dimensional translation) and 0.089° (3-dimensional rotation). Flexion of the knee did not affect MBRSA precision. Medial-lateral imaging is advantageous as it allows for flexion of the knee joint during an RSA examination, thus providing greater information for wear measurement.
