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Abstract：
OBJECTIVE: To investigate the orientations of the surgical epicondylar axis (SEA) of varus and non-varus knees in the coronal plane.
METHODS: One-hundred and sixty-two knees from 81 Chinese patients undergoing total knee arthroplasty (TKA) were retrospectively investigated. The angle between the medial side of the femoral mechanical axis and the SEA (MA-SEA), as well as the physiological valgus angle, was measured in the coronal plane using three-dimensional reconstruction. The joint line angle (JLA) and hip-knee-ankle angle (HKAA) were measured in long-leg weight-bearing radiographs. The mean of each parameter was compared between the varus (HKAA < 177.0°) and the non-varus knees (HKAA ≥ 177.0°) using an independent t test. Linear regression was used to assess the correlation between MA-SEA with JLA and HKAA.
RESULTS: A total of 42 non-varus knees (6 valgus and 36 neutral knees) and 98 varus knees were measured, as 22 knees were abandoned due to unrecognizable bony landmarks. The mean MA-SEA and JLA were significantly larger in non-varus knees (both, p < 0.01). The mean physiological valgus angle was 5.9 ± 1.0° for Chinese TKA patients and was significantly larger in varus knees (p < 0.01). There was a strong positive correlation between the MA-SEA and JLA (R 2 = 0.35, p < 0.05).
CONCLUSIONS: There were significant differences in the orientation of the SEA between varus and non-varus knees, which was strongly correlated with the orientation of the femoral joint line. These findings will enhance the current knowledge of knee anatomy and should prove useful for coronal alignment in TKA.
METHODS: III.
METHODS: One-hundred and sixty-two knees from 81 Chinese patients undergoing total knee arthroplasty (TKA) were retrospectively investigated. The angle between the medial side of the femoral mechanical axis and the SEA (MA-SEA), as well as the physiological valgus angle, was measured in the coronal plane using three-dimensional reconstruction. The joint line angle (JLA) and hip-knee-ankle angle (HKAA) were measured in long-leg weight-bearing radiographs. The mean of each parameter was compared between the varus (HKAA < 177.0°) and the non-varus knees (HKAA ≥ 177.0°) using an independent t test. Linear regression was used to assess the correlation between MA-SEA with JLA and HKAA.
RESULTS: A total of 42 non-varus knees (6 valgus and 36 neutral knees) and 98 varus knees were measured, as 22 knees were abandoned due to unrecognizable bony landmarks. The mean MA-SEA and JLA were significantly larger in non-varus knees (both, p < 0.01). The mean physiological valgus angle was 5.9 ± 1.0° for Chinese TKA patients and was significantly larger in varus knees (p < 0.01). There was a strong positive correlation between the MA-SEA and JLA (R 2 = 0.35, p < 0.05).
CONCLUSIONS: There were significant differences in the orientation of the SEA between varus and non-varus knees, which was strongly correlated with the orientation of the femoral joint line. These findings will enhance the current knowledge of knee anatomy and should prove useful for coronal alignment in TKA.
METHODS: III.
摘要：
目的：研究内翻和非内翻膝关节的手术上髁轴（SEA）在冠状平面上的取向。
方法：回顾性调查了81例接受全膝关节置换术（TKA）的中国患者的一百六十二膝。股骨机械轴的内侧与SEA（MA-SEA）之间的角度，以及生理外翻角度，使用三维重建在冠状面测量。在长腿负重X射线照片中测量关节线角度（JLA）和髋-膝-踝角度（HKAA）。使用独立t检验比较内翻（HKAA<177.0°）和非内翻（HKAA≥177.0°）之间每个参数的平均值。使用线性回归评估MA-SEA与JLA和HKAA之间的相关性。
结果：共测量了42个非内翻膝盖（6个外翻和36个中性膝盖）和98个内翻膝盖，由于无法辨认的骨性地标，22个膝盖被遗弃。非内翻膝盖的平均MA-SEA和JLA明显更大(两者，p<0.01)。中国TKA患者的平均生理外翻角为5.9±1.0°，内翻膝明显增大（p<0.01）。MA-SEA与JLA之间呈显著正相关(R2=0.35,p<0.05)。
结论：内翻和非内翻膝盖之间的SEA方向存在显着差异，这与股骨关节线的方向密切相关。这些发现将增强当前对膝关节解剖的了解，并且应被证明对TKA的冠状排列有用。
方法：III.
方法：回顾性调查了81例接受全膝关节置换术（TKA）的中国患者的一百六十二膝。股骨机械轴的内侧与SEA（MA-SEA）之间的角度，以及生理外翻角度，使用三维重建在冠状面测量。在长腿负重X射线照片中测量关节线角度（JLA）和髋-膝-踝角度（HKAA）。使用独立t检验比较内翻（HKAA<177.0°）和非内翻（HKAA≥177.0°）之间每个参数的平均值。使用线性回归评估MA-SEA与JLA和HKAA之间的相关性。
结果：共测量了42个非内翻膝盖（6个外翻和36个中性膝盖）和98个内翻膝盖，由于无法辨认的骨性地标，22个膝盖被遗弃。非内翻膝盖的平均MA-SEA和JLA明显更大(两者，p<0.01)。中国TKA患者的平均生理外翻角为5.9±1.0°，内翻膝明显增大（p<0.01）。MA-SEA与JLA之间呈显著正相关(R2=0.35,p<0.05)。
结论：内翻和非内翻膝盖之间的SEA方向存在显着差异，这与股骨关节线的方向密切相关。这些发现将增强当前对膝关节解剖的了解，并且应被证明对TKA的冠状排列有用。
方法：III.
