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首页> 外文期刊>Skeletal radiology >The neck-malleolar angle: an alternative method for measuring total lower limb torsion that considers the knee joint rotation angle.
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The neck-malleolar angle: an alternative method for measuring total lower limb torsion that considers the knee joint rotation angle.

机译：脖子-臼齿夹角：一种考虑膝盖关节旋转角度的测量下肢总扭力的替代方法。

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OBJECTIVE: A greater understanding of the lower limb geometry is necessary for the correction of lower limb torsional deformities. The purpose of our study was to measure the normal values of knee torsion using CT and to introduce the neck-malleolar angle as an alternative for measuring lower limb torsion. PATIENTS AND METHODS: We studied 77 consecutive CT studies performed from 2007 to 2009 in our clinic. In 67 cases, there was evidence of old trauma or surgical intervention to one limb, whereas the contralateral limb was healthy. The remaining 10 patients had no history of trauma or surgical intervention and were available for paired analysis in order to find the normal intraindividual variability. The whole limb, femoral and tibial torsion were measured according to the "Ulm method". Finally, the knee joint rotational angle and the neck-malleolar angle (the angle between the femoral neck axis and the bimalleolar axis) were measured. RESULTS: The average knee joint rotation angle was 2.4 +/- 6.4 degrees while the neck-malleolar angle was 13.2 +/- 10.2 degrees . Right to left side differences in healthy paired limbs for total limb rotation, knee joint rotation and the neck-malleolar angle were 6.1 +/- 4.1 degrees , 3.9 +/- 2.8 degrees and 7.5 +/- 4.3 degrees respectively. The mean absolute rotational differences between injured and healthy limbs was 14.5 +/- 10.1 degrees , whereas the mean absolute neck-malleolar differences amounted to 12.5 +/- 9.9 degrees (p = 0.013) indicating that the knee compensates for torsional asymmetries. CONCLUSIONS: The neck-malleolar angle takes into consideration the buffering effects of the knee joint in the transverse plane and contributes valuable additional information. Further studies including the long-term results of patients with torsional errors are important.
机译：目的：对下肢的几何形状有更多的了解对于矫正下肢的扭转畸形是必要的。我们研究的目的是使用CT测量膝关节扭转的正常值，并引入颈髓角作为测量下肢扭转的替代方法。患者与方法：我们研究了2007年至2009年在我们诊所进行的77项连续CT研究。在67例病例中，有证据表明对一只肢体有旧的创伤或手术干预，而对侧肢体则健康。其余10例患者没有外伤史或手术干预史，可以进行配对分析以发现正常的个体差异。根据“ Ulm法”测量整个肢体，股骨和胫骨的扭转。最终，测量膝关节旋转角度和颈部-睫状体角度（股骨颈轴与双侧颌骨轴之间的角度）。结果：平均膝关节旋转角度为2.4 +/- 6.4度，而颈髓角为13.2 +/- 10.2度。在健康的成对肢体中，左右肢总旋转度，膝关节旋转度和颈髓臼角的左右差异分别为6.1 +/- 4.1度，3.9 +/- 2.8度和7.5 +/- 4.3度。受伤肢与健康肢体之间的平均绝对旋转差异为14.5 +/- 10.1度，而颈部-颌骨的绝对绝对平均值为12.5 +/- 9.9度（p = 0.013），表明膝盖可以补偿扭转不对称。结论：颈髓角考虑了膝关节在横向平面上的缓冲作用，并提供了有价值的附加信息。重要的是进一步研究包括扭转错误患者的长期结果。

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