中文摘要：

目的：了解正常膝关节软骨分布及股骨髁承重区的软骨厚度特点，为膝关节病变早期诊断和动态观察提供依据。方法：选取100名成人志愿者，男、女各50名，年龄20—30岁，平均25．3岁，膝关节均行MRI扫描。应用MIMICS软件对图像进行处理，在矢状位窗面上测量膝关节各部位软骨最大厚度。选择膝关节正常运动时的承重区，测量承重区域软骨的最大厚度并与其他区域进行比较。基于MRI图像行膝关节软骨三维重建，观察膝关节软骨的三维形态特征。结果：膝关节各部位的最大软骨厚度如下。胫骨外侧平台3．19mm，胫骨内侧平台3．07mm，股骨外侧髁2．93mm，股骨内侧髁3．19mm，股骨滑车软骨3．57mm，髌软骨3．75mm。不同性别与左右侧之间的软骨厚度差异无统计学意义（P〉0．05）。胫股关节承重区软骨厚度大于其他区域，有统计学差异（P〈0．05）。结论：成人正常膝关节各区域软骨厚度不同，胫股关节承重区软骨厚度大于非承重区域。基于MRI可以准确地测量膝关节各部软骨的厚度及重建膝关节软骨的三维形态。

英文摘要：

Objective：To understand the distribution of normal knee cartilage andfemoralcondyle cartilage thickness of the weight bearing regions, to provide a basis for early diagnosis and dynamic observation for the knee joint disease. Methods ：50 male and 50 female, a total of 100 adult volunteers were involved, ranging from 20 to 30 years old, with a mean age of 25.3 years. All the knees were scanned by magnetic resonance im- aging （MRI）. Knee cartilage thickness of medial tibia platform, lateral tibia platform, patellar, femoral troch- lea, medial and lateral femoral condyle in sagittal windows were measured in the software MIMICS. The maxi- mum cartilage thickness of the selected area of normal weight bearing region were measured and compared. The three - dimensional morphological characteristics of the knee cartilage reconstructed was observed by MRI. Re- suits ：The maximum thickness of the knee joint cartilage on each regions were as follows ：Tibia lateral platform： 3.19mm, tibia1 medial platform ： 3.07mm, femoral lateral condyle ： 2.93 mm, femoral medial condyle ： 3.19mm, femoral trochlea cartilage：3.57mm, patellar cartilage：3.75mm. There were no statistical differences between men and women for cartilage thickness （ P 〉 0.05 ）, but significantly statistical differences between weight bear- ing regions and non - weight beating regions （ P 〈 0.05 ）. Conclusions ： The thickness of the normal adult knee joint cartilage is various in different regions, thickness of the weight beating regions were significantly greater than the non - weight beating regions in femoral condyle. Thickness of the knee joint cartilage can be ac- curately measured and the three - dimensional morphology of knee joint cartilage can be easily reconstructed based on MRI.