股骨上段髓腔的计算机测量方法(英文)

Computer-aided measurement of medullary cavity of proximal femur

背景:临床研究表明假体与股骨髓腔的匹配度决定假体的长期稳定性,以往股骨近端测量主要以正侧位X射线片为主,但存在较多误差。目的:研究股骨上段髓腔截面几何形态的统计规律。设计:重复测量观察。单位:上海交通大学医学院附属第九人民医院骨科。对象:选取无破损尸体股骨标本10个(上海第二医科大学解剖教研室提供)。方法:2000-01/03在上海第二医科大学附属第九人民医院骨科完成,以计算机图像处理的方法对股骨上段髓腔截面形态进行自动提取,并提出圆锥曲线拟合的参数化数学方法;同时采用人工方法对10例股骨上段髓腔截面的进行测量。主要观察指标:计算机和人工方法测量突出末端坐标和连接点坐标比较。结果:10个股骨标本均进入结果分析。计算机测量股骨上段髓腔截面突出末端坐标(X,Y)和连接点坐标(X,Y)与人工方法测量结果差异无显著性(P分别为0.9938,0.9969,0.9582,0.9606)。结论:计算机图像处理的方法对股骨上段髓腔截面形态进行自动提取测量法不仅减少了人为误差,且能以计算机自动完成,适合于大批量的形态计量。

DACKGROUND： Clinical studies demonstrate that the durable stability of the prosthesis depends on a close geometric fit between the prosthesis and femoral medullary cavity. OBJECTIVE： To study the law of the parameters of medullary canal section shape in proximal femur. DESIGN： Repeated measurement observation. SETTING： Department of Orthopaedics, Ninth People＇s Hospital, School of Medicine, Shanghai Jiaotong University. MATERIALS： Ten fernoral samples without any damage was obtained from corpse in the Staff Room of Anatomy of the Shanghai Second Medical University. METHODS： The experiment was carried out in the Department of Orthopaedics, Ninth People＇s Hospital between January 2000 and March 2000.Section morphology of medullary cavity of proximal femur was dealt with image-processing, and conus curve fitted parameter mathematical method was proposed; and at the same time, section of medullary cavity of proximal femur of 10 patients was measured manually. MAIN OUTCOME MEASURES： Computer-aided method and manual methood were applied to measure the coordiation at the end of extrude and the coordinate of link joint. RESULTS： 10 femoral samples entered the stage of result analysis, Computer was used to measure the coordination of the end of extrude of the section medullary cavity of proximal femur（X, Y） and the coordination of the connection point （X. Y）. There was no significant difference of the measuring results between coputer-aided method and manual. CONCLUSION： Computer-aided imaging-processing method not only reduces the error but also can be completed by computer automatically in measuring section morphology of medually cavity in proximal femur. It is suitable for a variety of morphology measurement.