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J Biomech. 2014 Jun 3;47(8):1914-7. doi: 10.1016/j.jbiomech.2014.03.034. Epub 2014 Apr 3.

The effect of patient positioning on the precision of model-based radiostereometric analysis.

Author information

1
Department of Biosystems Engineering, University of Manitoba, Winnipeg, MB, Canada; Concordia Joint Replacement Group, Concordia Hip and Knee Institute, Winnipeg, MB, Canada. Electronic address: tgascoyne@cjrg.ca.
2
Department of Biosystems Engineering, University of Manitoba, Winnipeg, MB, Canada.
3
Department of Surgery, 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.

KEYWORDS:

Micromotion; Phantom; Precision; Radiostereometric analysis; Total knee replacement; Wear analysis

PMID:
24735503
DOI:
10.1016/j.jbiomech.2014.03.034
[Indexed for MEDLINE]

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