隐性骨与软骨损伤的MRI诊断

目的探讨隐性骨与软骨损伤的MRI特点,分析骨挫伤、隐性骨折和关节软骨损伤间的关系。方法回顾性分析了101例隐性骨与软骨损伤,其中骨挫伤70例,隐性骨折13例,关节软骨损伤18例。观察病变的MRI特点、分布,检出骨挫伤的序列敏感性。结果T1WI,STIR或PDWI(f/s)检出骨挫伤的敏感性为95.7%及100%。骨挫伤病变在关节主要分布于骨骼的边缘,脊椎主要分布于椎体上缘终板下。隐性骨折骨折线走行方向不定,平均宽度为1.8 mm,邻近区域的骨挫伤是其重要的间接征象。关节软骨损伤MRI表现为关节软骨变薄、断裂或缺损,软骨下骨挫伤出现率为100%。结论隐性骨折和关节软骨损伤均合并有骨挫伤,MRI是诊断隐性骨与软骨损伤的敏感方法。

MR Imaging Diagnosis of Occult Bone and Cartilage Injuries

Objective To investigate MR imaging features of occult bone and cartilage injuries and to evaluate the relationship among bone contusion,occult fracture and joint cartilage injury.Methods 101 patients with occult bone and cartilage injuries were retrospectively analyzed,including 70 patients with bone contusion,13 with occult fracture and 18 with joint cartilage injury.MR imaging features,distribution of lesions and the sensitive series in the detection of bone contusion by MR imaging were evaluated.Results T1WI and STIR or PDWI(f/s) were more sensitive sequences in detecting the bone contusion(95.7% and 100% respectively).Bone contusion course of mainly distributed in the margin area of joint and in superior portion of vetebral body.The course of the occult fracture lines was irregular,the width of fracture lines was about 1.8 mm with bone contusion in nearby area.On MR imaging,joint cartilage injury appeared as the thicknees of articular cartilage decreased or defect,subcartilage contusion was seen in 100%.Conclusion The occult fracture and joint cartilage injuries are all associated with bone contusion.MR imaging is the sensitive method in determining the occult bone injuries.