膝关节骨关节炎MRI表现

目的：评价MRI在膝关节骨关节炎临床诊治中的价值。方法：对127例184个受累膝关节骨关节炎MRI各序列图像进行分析。结果：所有膝关节均表现不同程度MRI异常信号改变，15个仅表现为单纯软骨下骨质水肿．27个表现为I级软骨损伤，35个表现为Ⅱ级软骨损伤，40个表现为Ⅲ级软骨损伤，67个表现为Ⅳ级软骨损伤，82个关节间隙不均匀变窄，103个膝关节存在轻一中等度滑膜增厚，少一中等量关节腔积液。软骨损伤MRI分别表现为高信号软骨内异常低信号影．软骨面毛糙、缺损、完全缺失、骨赘形成。软骨下骨单纯水肿在T1wI上表现为片状低信号，FS-T1WI-FLASH上呈高信号，骨质吸收破坏呈斑片状长T1长T2影，境界清晰，骨质增生硬化在MRI各序列上均呈片状、条状、环状及分隔状低信号。结论：MRI能准确反映膝关节骨关节炎损伤的程度、范围，为临床对骨关节炎的诊治提供了可靠、直接的依据。

MRI features of knee osteoarthritis

Objective：To evaluate MRI in the clinical diagnosis of knee osteoarthritis. Methods： 184 knees of 127 cases were involved and all the MRI images were analyzed. Results： Various abnormal signal in MRI images was observed. 15 only showed subchondral bone edema, while I , II , III and IV grade cartilage damage, respectively 27, 35, 40 and 67, uneven joint space narrowing in 82. Each knee joint showed light-moderate synovial thickening and small-medium amount of joint effusion. MRI showed abnormal low signal within high signal cartilage, while the cartilage surface was rough, defective or completely absent, as well as osteophyte formation. Subchondral bone edema alone showed low-signal chip in T1WI, high signal in FS-T1 WI-FLASH, while bone resorption and destruction showed patchy long T1 and long T2 signal with clear realm, bone hyperostosis and sclerosis showed patchy, strip, annular or separate low signal. Conclusion： MRI can accurately reflect the extent and the scope of the knee osteoarthritis, providing a reliable and direct basis for clinical diagnosis and treatment.