低场磁共振脂肪抑制序列在膝关节骨挫伤及隐性骨折诊断中的应用价值

目的探讨低场磁共振脂肪抑制（STIR）序列在膝关节骨挫伤及隐性骨折诊断中的应用价值。方法35例膝关节急性外伤患者均行X线平片及MR检查，其中9例同时行CT检查。MR检查序列包括FSE T1WI、T2WI，STIR，GRE等。对骨挫伤及隐性骨折的MRI表现进行分析。结果本组35例X线平片均未见异常，MR检查在常规FSE序列中能显示33个骨挫伤病灶，STIR序列能检出49个骨挫伤病灶，隐性骨折线13条，病变以STIR序列上表现最明显，MRI能有效显示骨挫伤及隐性骨折的病变部位、范围及形态。结论MRI在骨挫伤及隐性骨折影像检查中具有明显的诊断优势，其脂肪抑制序列是明确诊断的最佳序列。

The value of low field MR imaging with STIR sequence in diagnosing bone contusions and occult fractures of the knee joint

Objective To evaluate the low field MR imaging with STIR sequence in diagnosing bone contusions and occult fractures of the knee joint. Methods 35 patients with acute trauma of the knee joint were examined using X- ray and MRI,3 cases also underwent CT examinations. MR sequences included FSE T1WI,T2WI,STIR and GRE. The MRI findings of the bone contusions and occult fractures were analyzed. Results All 35 cases had normal radiographic results,33 bone contusions were revealed on MRI FSE sequences,49 bone contusions and 13 occult fractures on MRI STIR sequences. The location, extent and shape of bone contusions and occult fractures were delineated accurately on MRI STIR sequences. Conclusion MRI have fairly high advantage in diagnosing bone contusions and occult fractures andST1R would be the best effective sequence.