Arthroscopy of the knee is plasying on increasingly important role in the diagnosis and treatment of the Interanl Deragngement of the Knee. Magnetic resonance imaging is a non-invasive, and relatively accurate method of diagnosis but it has some
difficulty in reading. Therefore, the purpose of our study is to increase the diagnostic value of MRI by dividing MRI signals specifically.
From Sept. 1993 to Jan. 1994, authors analyzed 54 patients on whom MRI, arthroscopy were performed in internal derangement of the knee.
@ES The results obtained were as follows:
@EN 1) There were 60 meniscus tears and 22 cruciate ligament injuries and 3 extra-articular masses, 21 chondromalacia by arthroscopic diagnosis.
2) MRIe finding in actual ACL tear, wer equite similar comparing partial rupture of more than 50% with complete rupture.
3) As for partial rupture of more than 50%, there was low axis with no visualization, and relatively empty lateral wall findings, these show up us that the described findings are not present in minimal partial rupture of less than 50%.
4) Sensitivity of MRI, in order, is PCL, ACL, Meniscus and for specificity, PCL, Medial meniscus, ACL, lateral meniscus. From MRI, high PPV is found in anterior, mid horn of medial meniscus, and high NPV is found in anterior horn of both
meniscus.
5) Chondromalacia were hardly found in MRI while it was possible from arthroscopy.
6) MRI is useful in diagnosintg extra-articular mass, bony contusion, a very low diagnosing rate of chondromalacia and synovitis.
We believe that MRI, when combined with clinical and roentgenographic findings, provides the most accurate non-invasive source of information in diagnosis of cruciate ligament and meniscus injuries.
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