Abstract：【Objective】To explore the value of 3.0 T MRI in the diagnosis of bone infarctions of the knee. 【Methods】Twentyfive patients with bone infarction in the knee, who were confirmed by pathological examination, were enrolled in the study. All patients underwent a 3.0T MRI scan. The MRI features of all patients' images were analyzed. 【Results】In 28 knee joints with bone infarctions, 55 total lesions were detected. Of them, 39 lesions involved both the distant femur and proxial tibia, 11 lesions only involved the distant femur, and 5 lesions involved only the proxial tibia. Fifteen lesions demonstrated the "three ring sign", in which the center of lesion equal or slightly longer than T1, equal or slightly longer than T2, with long T1 and long T2 signal bands around. Ten lesions demonstrated the "double line sign", in which the center of lesion was equal or slightly longer than T1, equal or slightly longer than T2, with the line equal lengths with long T1 and long T2 signals in the proximity. Ten lesions of late bone infarctions demonstrated the "single ring sign", in which both the lesion's center and edge showed low signals in MR. Calcification was also found in some lesions, which demonstrated lower signals. 【Conclusion】Examination of bone infarction characteristics using the 3.0T MRI can signal changes directly, issue multilevel responses of bone infarction range, and determine location by application of different MRI sequences. It provides important clinical implications in diagnosis and treatment of knee joint bone infarctions.
2016, Vol. 33 
