患者体位对基于模型的放射立体分析精度的影响。
The effect of patient positioning on the precision of model-based radiostereometric analysis.
机构信息
Department of Biosystems Engineering, University of Manitoba, Winnipeg, MB, Canada; Concordia Joint Replacement Group, Concordia Hip and Knee Institute, Winnipeg, MB, Canada.
Department of Biosystems Engineering, University of Manitoba, Winnipeg, MB, Canada.
出版信息
J Biomech. 2014 Jun 3;47(8):1914-7. doi: 10.1016/j.jbiomech.2014.03.034. Epub 2014 Apr 3.
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.
需要一种可重复的方法来测量全膝关节置换术（TKA）中的聚乙烯磨损，本研究使用 TKA 模型检查了不同患者-射线照片方向和膝关节弯曲角度下基于模型的放射立体分析（MBRSA）的体外精度。前后和内外成像方向具有最高的精度，优于 0.036mm（三维平移）和 0.089°（三维旋转）。膝关节弯曲不会影响 MBRSA 精度。内外成像具有优势，因为它允许在 RSA 检查期间弯曲膝关节，从而为磨损测量提供更多信息。
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