MRI Features of Foot Fatigue Fracture Without X-ray Film Abnormality / 实用放射学杂志

ABSTRACT

Objective To study the MRI features of the fatigue fracture of ankle.Methods 15 patients including 11 man and 4 women were studied.The age of the patients ranged from 15～45 years,with average of 22 years.All cases had no traumatic history of ankle joint and a negative result of plain radiographs,and its clinical symptoms was pain in the local site of feet.Siemens 1.5T MRI with SE and FSE were used to investigate the ankle,T 1WI(TR/TE=700/20)and T 2WI(TR/TE=4700/100) and T 2WI fat surpassion.Results All cases demonstrated abnormal MRI signals in both T 1 and T 2 weighted image6 involving the talus,7 involving calcaneus,1 case located the navicular bone and 1 case involving both talus and calcaneus.15 cases with 16 were abnormalities of bone marrow,which 10 demonstrated hypointensity on T 1WI and hyperintensity on T 2WI,6 cases with hypointensity on T 1WI and complex signal intensity on T 2WI.Conclusion MR features of fatigue fracture of ankle joint without abnormality in X-ray films include trabecular fracture under cortical bone and edema in the trabecular bone which demonstrate irregular abnormal signal in MRI.