Sailhan Frédéric, Jacob Louis, Hamadouche Moussa
Hospital Cochin, Paris, France.
University of Paris 5, Paris, France.
Int Orthop. 2017 Oct;41(10):2009-2016. doi: 10.1007/s00264-017-3428-z. Epub 2017 Feb 24.
The purpose of this study was to compare the femoral mechanical-anatomical (FMA) and mechanical femoro-tibial (MFT) angles in an osteoarthritic population using the 2D (two dimension) and the 3D (three dimension) EOS low-dose biplanar radiographic system (EOS).
FMA and MFT angles were calculated in 127 adults with osteoarthritis. In 2D, FMA angle was measured between the femoral mechanical axis and the femoral anatomical axis, and MFT angle between the femoral mechanical axis and the tibial mechanical axis. In 3D, the measurement of FMA angle consisted of identifying specific anatomical landmarks on X-rays. MFT angle was then measured between the femoral mechanical axis and the tibial mechanical axis. The distribution of 2D and 3D values was assessed in terms of means and variances.
Mean age was 69 ± 12 years. A total of 10% of the patients having a 3D FMA angle between 4° and 7° have a 2D-measured FMA over or underestimated. Particularly, FMA values tend to be underestimated in women in 2D. Finally, we found that men showed a tendency to a more varus morphology, with MFT values being significantly underestimated in 2D.
The EOS 3D reconstruction system is a reliable method to measure FMA and MFT angles in an osteoarthritic population.
本研究旨在使用二维（2D）和三维（3D）EOS低剂量双平面放射成像系统（EOS），比较骨关节炎患者人群中的股骨机械解剖（FMA）角和股胫机械（MFT）角。
对127例骨关节炎成年患者计算FMA角和MFT角。在二维中，FMA角在股骨机械轴与股骨解剖轴之间测量，MFT角在股骨机械轴与胫骨机械轴之间测量。在三维中，FMA角的测量包括在X射线上识别特定的解剖标志点。然后在股骨机械轴与胫骨机械轴之间测量MFT角。根据均值和方差评估二维和三维测量值的分布情况。
平均年龄为69±12岁。三维FMA角在4°至7°之间的患者中，共有10%的患者二维测量的FMA角存在高估或低估情况。特别是，二维测量时女性的FMA值往往被低估。最后，我们发现男性呈现出更明显的内翻形态倾向，二维测量时MFT值被显著低估。
EOS三维重建系统是测量骨关节炎患者人群中FMA角和MFT角的可靠方法。
