计算机软件测定股骨头坏死的体积及其意义

Volumetic analysis of osteonecrosis of the femoral head using computer software

目的评估计算机软件测定股骨头坏死体积比的准确性。方法 20个比格犬(40髋)通过液氮冷冻法制成双侧股骨头坏死模型,对股骨头坏死区域体积比通过二种不同的方法来计算:①通过液体测量法测定股骨头体积和坏死股骨头体积,二者相除即为体积比;②将坏死模型的MRI图像以Dicom导入Minics,重建坏死区与股骨头的三维图像,通过逆向工程软件Geomagic处理后,导入Ansys软件划分单元,计算所有坏死单元的体积与整个股骨头单元体积比。结果计算机软件计算的体积比结果为(26.4±10.2)%,实体测定的体积比为(25.8±10.6)%,通过SPPS11.0分析,无统计学差异。结论计算机软件能准确评估股骨头坏死区域体积比,是一个可以提倡的新方法。

Objective To evaluate the accuracy of volume ratio of osteonecrosis of the femoral head measured by special computer software.Methods Necrotic volumetric ratio was evaluated by two methods in forty necrotic hips （from twenty beagle dogs） induced by liquid nitrogen：firstly,volume ratio was confirmed by the volume percentage of the necrotic lesion and the entire femoral head measured using fluid displacement.Secondly,all dogs were subjected to MRI scan before operation,and the image data were transferred to Dicom format using Mimics software,for reconstructing the three dimensional modal of the osteonecrosis of the femoral head,and then,Geomagic process and Ansys division was used to analyze the volume ratio.Results There were no significant difference appeared between the results of fluid displacement（25.8±10.6）% and the Mimic analysis（26.4±10.2）%.Conclusions As a new method,computer software is reliable for the accurate assessment of lesion size of ONFH.