Objective To evaluate the diagnosis value of low-field magnetic resonance on anterior cruciate ligament rupture. Methods MR images of 92 patients undergoing knee joint surgery during January 2009 and October 2010 were respectively analyzed. The diagnosis value of low-field magnetic resonance on anterior cruciate ligament rupture was analyzed and surgical findings were the gold standard. Results Among 92 patients, 25 were diagnosed as having anterior cruciate ligament rupture by MR, 22 were confirmed by surgery findings, and other 3 patients had anterior cruciate ligament injury ( not rupture ); 4 patients were diagnosed as having anterior cruciate ligament injury but were confirmed as having anterior cruciate ligament rupture in surgery. Low-field MR diagnosis of anterior cruciate ligament rupture had sensitivity rate of 84.6% , specificity rate of 95.5% , positive predictive value of 88.0% , and negative predictive value of 94.0%. Conclusion Low-field MR can be used in anterior cruciate ligament rupture in preoperative evaluation.%目的 评价低场强磁共振对膝关节前交叉韧带断裂的诊断价值.方法 回顾分析我院2009年1月1日～2010年10月31 日行膝关节手术治疗并于术前做膝关节磁共振检查92例的临床资料,以手术所见为金标准,分析低场强(0.2 T)磁共振对前交义韧带断裂的诊断价值.结果 本组92例磁共振诊断前交叉韧带断裂25例,符合手术所见22例,另3例术中证实为前交叉韧带损伤(未断裂)；磁共振诊断前交叉韧带损伤而手术证实断裂4例.低场强磁共振对前交叉韧带断裂诊断的敏感性为84.6%,特异性为95.5%,阳性预测值为88.0%,阴性预测值为94.0%.结论 低场磁共振可用于前交叉韧带断裂的术前评估.
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