MRI Imaging of the Acute Knee Injury Associated with Fracture Around the Knee Joint.

概要

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In the acute knee injury accompanied by a fracture around the knee joint, diagnosis of ligamentous and meniscal injury is difficult. Neither the stress test nor arthrogram helps in the diagnosis of ligamentous and meniscal injuries because of instability at the fracture site and rupture of the joint capsule. We compared MRI findings with operative findings in eight acute knee injuries with fracture. Operative findings revealed lateral meniscus injury in three knees, ACL+MCL+LCL injury in one, ACL+MCL, injury in two, solitary ACL injury in one and no soft tissue injury in one. Accuracy of ligamentous and meniscal iniury diagnosed by MRI was 100% in ACL, PCL and MCL, 88% in meniscal (one false positive in MRI finding) and 63% in LCL (three false positives), False positive finding of LCL injury was mainly caused by misreading of a redundant LCL accompanied by lateral tibial condylar fracture which caused disruption of LCL. Accuracy of diagnosis will improve by aveiding this false positive finding of LCL injury. MRI was not only non-invasive but also a useful diagnostic tool for the evaluation of ACL, PCL, MCL and menisci even in acute knee injury.
西日本整形・災害外科学会の論文