MR imaging and MR arthrography for diagnosis of recurrent tears in the postoperative meniscus.

The accuracy, pitfalls, and limitations of magnetic resonance (MR) imaging for diagnosing a tear in the nonoperated knee are well known. However, the diagnosis of a recurrent tear can be more difficult in the postoperative meniscus. Resection or meniscal repair results in postoperative changes that can mimic a recurrent tear. To serve as a foundation, the techniques of treatment for meniscal tears are reviewed. This is followed by a detailed review of the literature on the accuracy of diagnosis of a recurrent meniscal tear using MR imaging and MR arthrography. Finally, recommendations are given as to the circumstances in which MR imaging or MR arthrography should be used for evaluation of the postoperative meniscus.