骨挫伤的MRI诊断价值

目的探讨骨挫伤的MRI影像表现及MRI在骨挫伤影像诊断中的价值.方法回顾性分析34例骨挫伤和3例隐匿性骨折病例的X线平片、CT及MRI影像资料,分析骨挫伤的MRI影像表现,评估X线平片、CT及MRI在骨挫伤影像诊断中的作用.结果全部病例的X线平片均未见异常.CT能有效显示3例隐匿性骨折的部位和形态,但34例骨挫伤病例CT均未能予以诊断.3例CT诊断为隐匿性骨折的病例MRI诊断为骨挫伤而未能显示骨折的存在.MRI能有效显示不同部位骨挫伤的病变部位、范围及形态,在SE序列上骨挫伤的典型MRI表现为不规则片状T1WI低信号、T2WI高信号的异常信号改变,骨皮质及骨轮廓不发生变化.结论在X线平片、CT及MRI三种影像检查方法中,MRI是唯一能有效诊断骨挫伤的检查方法,但MRI不能明确区别骨挫伤和未分离、移位的隐匿性骨折.

Diagnostic Value of Magnetic Resonance Imaging on Bone Contusion

Objective To research appearance of magnetic resonance imaging (MRI)of bone contusion and value of MRI in diagnosing bone contusion.Methods The data of X-ray plain film,computed tomography(CT)and MRI of 34 cases of bone contusions and 3 cases of occult fractures were retrospectively analyzed.MRI appearances of bone contusions were analyzed.Values of plain film,CT and MRI in diagnosing bone contusion were assessed.Results No abnormalities of all patients on plain films were found.The locations and appearances of 3 cases occult fractures could be shown on CT.But CT could not detect lesions of 34 cases of bone contusions.3 cases of occult fractures were mistaken for bone contusions on MRI and the occult fractures could not be demonstrated on MRI.MRI had an ability to delineate accurately the location,extent and appearance of bone contusion.Typical appearances of bone contusions for MRI spin echo sequence were local signal changes which appeared hypo-intensity signal on T 1-weighted imaging and hyper-intensity signal on T 2-weighted imaging,neither disruption of cortical bone nor change of bone configuration was observed on MRI.Conclusion Among X-ray plain film,CT and MRI,MRI is the only effective way of diagnosing bone contusion.But it is difficult to differentiate between bone contusion and non-displaced occult fracture on MRI.