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首页> 外文期刊>Skeletal radiology >A comparative study of the accuracy of Ranawat's and Pierchon's methods to determine the centre of rotation in bilateral coxopathy.
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A comparative study of the accuracy of Ranawat's and Pierchon's methods to determine the centre of rotation in bilateral coxopathy.

机译：Ranawat和Pierchon方法确定双侧髋关节旋转中心的准确性的比较研究。

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OBJECTIVE: The objective of the study was to compare two methods (Ranawat's and Pierchon's) used to determine the centre of rotation of the hip and establish which method calculates a position nearer to the real centre of rotation. PATIENTS AND DESIGN: We selected 24 patients with unilateral osteoarthritis of the hip. The centre of rotation of the healthy hip was determined in two consecutive radiographic studies by superimposing a template of circles and using two axes as the reference lines (X-axis=teardrop line; Y-axis=a line perpendicular to the X-axis, drawn from the intersection of the ilio-ischiatic line and the teardrop line). After ensuring the stability of these references, both methods were applied to the same radiograph to determine which one established a centre of rotation nearer to the anatomical centre identified by the template of circles. RESULTS: When the values for the healthy hip are compared with those obtained using Ranawat's method, highly significant differences are observed for both X (P<0.0001) and Y (P<0.0001). When the results for the healthy hip are compared with the values obtained using Pierchon's method, neither the X (P=0.722 ) nor the Y values (P=0.112) show any significant differences. It would be advisable to use Pierchon's method to determine the centre of rotation during the preoperative planning for a total hip arthroplasty when the anatomical alteration is bilateral.
机译：目的：本研究的目的是比较两种用于确定髋关节旋转中心的方法（Ranawat和Pierchon），并确定哪种方法可以计算出更接近真实旋转中心的位置。患者与设计：我们选择了24例髋部单侧骨关节炎患者。在两次连续的射线照相研究中，通过叠加圆圈模板并使用两个轴作为参考线（X轴=泪滴线; Y轴=垂直于X轴的线， （从虹膜坐骨线和泪滴线的交点绘制）。在确保这些参考文献的稳定性之后，将这两种方法应用于同一张X射线照片，以确定哪种方法建立的旋转中心更接近圆模板所标识的解剖学中心。结果：将健康臀部的值与使用Ranawat方法获得的值进行比较时，在X（P <0.0001）和Y（P <0.0001）上均观察到非常显着的差异。将健康髋关节的结果与使用Pierchon方法获得的值进行比较时，X值（P = 0.722）和Y值（P = 0.112）均无显着差异。在解剖学改变为双侧的全髋关节置换术的术前计划中，建议使用Pierchon方法确定旋转中心。

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