膝关节骨挫伤的MRI诊断及其随访研究

The diagnosis and follow-up study of knee joint contusion with MRI

目的:探讨膝关节骨挫伤的MRI表现及其随访特征。方法:回顾性分析112例膝关节外伤后普通X线检查膝关节未发现明显异常而MRI检查发现骨挫伤的患者,所有病例均行膝关节T1WI、T2WI、STIR序列扫描,着重分析骨挫折的MRI表现。结果:112例膝关节骨挫伤发现病灶235个,在MRI表现为不规则的斑片状、地图状的异常信号区域,病灶在T1WI上表现为不均匀低信号,在T2WI上表现为混杂高信号,在STIR序列上表现为明显高信号区,其中99例伴有不同程度的膝关节其他损伤。235个骨挫伤病灶中,在T1WI上显示209个,在T2WI上显示病灶203个,在STIR上全部显示,而且病灶边界和范围较T1WI、T2WI显示更清楚。15例进行了MR随访复查,2例膝关节骨挫伤在24周尚未完全吸收。结论:MRI是早期诊断和定期随访膝关节骨挫伤的重要影像学方法。

Objective：To investigate the MRI appearances and follow-up features of knee joint contusion. Methods： MR imagings of 112 cases with knee joint contusion were retrospectively analyzed with emphasis on the appearances of bone contusion. All the knee joints without abnormalities on conventional X-ray examination underwent MR scanning with multiple sequences, such as T1-Weighted imaging, T2-Weighted imaging, and short time inversion recovery （STIR） imaging.Results：235 bone contusion lesions were found in all 112 cases, which demonstrated irregular or map-shaped lesions with low signal on T1WI, mild high signal on T2WI and evident high signal on STIR sequence. 99 out of 112 cases were complicated with other knee joint traumas. Of the 235 lesions,209 were found on T1WI,203 were found on T2WI, and all the lesions were found on STIR with more remarkable border than on T1WI and T2WI. 15 cases underwent follow-up MR scanning, 2 cases did not completely disappeared after 24 weeks. Conclusion： MRI is an important imaging method for early diagnosis and follow-up study of knee joint contusion.