JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE B 2014 Vol.15 No.8 P.720-726

Three-dimensional reconstruction method for measuring the knee valgus angle of the femur in northern Chinese adults*

Author(s): Tong Liu¹, Chen-yu Wang², Jian-lin Xiao¹, Lan-yu Zhu³, Xue-zhou Li⁴, Yan-guo Qin⁴, Zhong-li Gao¹
Affiliation(s): 1. Department of Orthopedics, China-Japan Union Hospital of Jilin University, Changchun 130033, China; more
Corresponding email(s): liutong1986@gmail.com
Key Words: Knee valgus angle, Three-dimensional reconstruction femoral model, Total knee arthroplasty, Northern Chinese adults, Preoperative design

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Tong Liu, Chen-yu Wang, Jian-lin Xiao, Lan-yu Zhu, Xue-zhou Li, Yan-guo Qin, Zhong-li Gao. Three-dimensional reconstruction method for measuring the knee valgus angle of the femur in northern Chinese adults[J]. Journal of Zhejiang University Science B, 2014, 15(8): 720-726.

@article{title="Three-dimensional reconstruction method for measuring the knee valgus angle of the femur in northern Chinese adults",
author="Tong Liu, Chen-yu Wang, Jian-lin Xiao, Lan-yu Zhu, Xue-zhou Li, Yan-guo Qin, Zhong-li Gao",
journal="Journal of Zhejiang University Science B",
volume="15",
number="8",
pages="720-726",
year="2014",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.B1400019"
}

%0 Journal Article
%T Three-dimensional reconstruction method for measuring the knee valgus angle of the femur in northern Chinese adults
%A Tong Liu
%A Chen-yu Wang
%A Jian-lin Xiao
%A Lan-yu Zhu
%A Xue-zhou Li
%A Yan-guo Qin
%A Zhong-li Gao
%J Journal of Zhejiang University SCIENCE B
%V 15
%N 8
%P 720-726
%@ 1673-1581
%D 2014
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.B1400019

TY - JOUR
T1 - Three-dimensional reconstruction method for measuring the knee valgus angle of the femur in northern Chinese adults
A1 - Tong Liu
A1 - Chen-yu Wang
A1 - Jian-lin Xiao
A1 - Lan-yu Zhu
A1 - Xue-zhou Li
A1 - Yan-guo Qin
A1 - Zhong-li Gao
J0 - Journal of Zhejiang University Science B
VL - 15
IS - 8
SP - 720
EP - 726
%@ 1673-1581
Y1 - 2014
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.B1400019

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: The purpose of this study was to establish a method for measuring the knee valgus angle from the anatomical and mechanical axes on three-dimensional reconstruction imaging models, and to use this method for estimating an average knee valgus angle value for northern Chinese adults. Computed tomographic angiography data in DICOM format for 128 normal femurs from 64 adult subjects were chosen for analysis. After the femur images were subjected to three-dimensional reconstruction, the deepest point in the intercondylar notch (point A), the midpoint of the medullary cavity 20 cm above the knee-joint line (point B), and the landmark of the femoral head rotation center (point C) were identified on each three-dimensional model. The knee valgus angle was defined as the angle enclosed by the distal femoral anatomical axis (line AB) and the femoral mechanical axis (line AC). The average (mean±SD) of knee valgus angle for the 128 femurs was 6.20°±1.20° (range, 3.05° to 10.64°). Significant positive correlations were found between the knee valgus angles of the right and left sides and between the knee valgus angle and age. During total knee arthroplasty, choosing a valgus cut angle of approximately 6° may achieve a good result in reestablishing the natural mechanical alignment of the lower extremity for patients of northern Chinese ethnicity. Larger valgus cut angles should be chosen for older patients.

三维重建法测量中国北方成人股骨膝外翻角

研究目的：利用三维重建影像模型获取膝外翻角，并通过使用这种方法来测量中国北方成人膝外翻角的平均估计值。
创新要点：本研究所获取的膝外翻角平均值对于在中国北方人群进行膝关节置换术时有着重要的参考意义，新的三维重建测量法使得膝外翻角的术前个体化测量更加精确。
研究方法：利用64名患者的CT血管造影（CTA）的DICOM数据获取共128件股骨三维重建模型。在重建的股骨模型上分别定位髁间凹最高点（点A）、膝关节线上20cm截面的髓腔中点（点B）和股骨头旋转中心（点C）。之后膝关节外翻角即由股骨远端解剖轴（线AB）与股骨机械轴（线AC）所围成（上述定位过程详见图5）。经统计分析后，128件股骨的平均外翻角值为6.20°±1.20°。统计分析还发现，膝外翻角与个体年龄呈显著性正相关，同一个体的左右侧外翻角呈显著性正相关。
重要结论：在对北方成年人群进行膝关节置换术时，选取外翻角为6°可会在重建人体下肢力线上获得更好的术后效果。在对年长患者进行手术时应选用更大的外翻角。
膝外翻角；股骨三维重建模型；中国北方成人；膝关节置换术；术前设计

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三维重建法测量中国北方成人股骨膝外翻角

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