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两维有限单元法计算股骨与假体界面的应力、变形往往是以带有假体的股骨在正位的Ｘ光片尺寸为原始数据的。Ｘ光片和实际尺寸之间一般存在一个比例因子，并且，由于假体是装在人体内的，很难保证拍摄平面就是股骨和假体的中心平面。为了获得股骨和假体在中心平面的实际尺寸，本文介绍了一种面向髋关节置换的从Ｘ光片到中心平面尺寸的数据恢复方法。首先，利用假体实体及其在Ｘ光片上的投影关系求出Ｘ光片与实际尺寸的比例系数及投影面和股骨中心平面的夹角，然后，由Ｘ光片上股骨的投影反求出其在中心平面的实际尺寸。
The two-dimensional finite element method calculates the stress at the interface between the femur and the prosthesis. The deformation is often based on the original X-ray film size of the femur with prosthesis. There is generally a scaling factor between the radiograph and the actual size, and since the prosthesis is contained within the human body, it is difficult to ensure that the imaging plane is the central plane of the femur and prosthesis. In order to obtain the actual size of femur and prosthesis in the center plane, this paper introduces a data recovery method from X-ray to center plane for hip replacement. First, using the prosthesis body and its projection relationship on the X-ray film, the ratio between the X-ray film and the actual size and the angle between the projection plane and the center plane of the femur are obtained. Then, the angle between the X-ray film and the femur is obtained The actual size in the center plane.