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Meniscal pathology. The expanding role of magnetic resonance imaging
1Department of Radiology, Santa Barbara Cottage Hospital, California 93105.
Abstract:
Magnetic resonance imaging (MRI) is a recently developed diagnostic medical imaging technology that shows great promise in the evaluation of knee meniscal diseases. Fifty-seven patient knees were evaluated by a single experienced MRI interpreter; the findings were compared with arthroscopic findings by a single experienced knee arthroscopist. The overall sensitivity and specificity rates of MRI for tears in virgin menisci compared to arthroscopy were both 92%. These results support reports in the literature that MRI is an accurate noninvasive technique for evaluating meniscal tears. Seven patients were treated with arthroscopic meniscal repair and were evaluated by MRI before and after surgery. Despite an asymptomatic postoperative status in six patients, abnormal intrameniscal signal persisted in four. An unstable meniscal fragment was visualized in the patient with postoperative pain. MRI is also useful in evaluating meniscal degeneration, meniscal ossicles, parameniscal cysts, and abnormal meniscal morphology. MRI is the noninvasive diagnostic technique of choice in evaluating a spectrum of knee meniscal diseases.
Insights
Magnetic resonance imaging (MRI) accurately diagnoses knee meniscal tears with 92% sensitivity and specificity. This noninvasive technique is the preferred diagnostic tool for various meniscal conditions.
Area of Science:
- Orthopedics
- Radiology
- Medical Imaging
Background:
- Knee meniscal diseases are common and can cause significant pain and disability.
- Accurate diagnosis is crucial for effective treatment and management.
- Magnetic resonance imaging (MRI) has emerged as a promising noninvasive diagnostic tool.
Purpose of the Study:
- To evaluate the diagnostic accuracy of MRI for knee meniscal tears.
- To assess MRI's utility in evaluating various meniscal pathologies.
- To compare MRI findings with arthroscopic results.
Main Methods:
- Fifty-seven patient knees with suspected meniscal disease underwent MRI.
- MRI findings were compared with arthroscopic surgical findings.
- Seven patients with meniscal repair were evaluated pre- and post-surgery using MRI.
Main Results:
- MRI demonstrated 92% sensitivity and 92% specificity for detecting tears in virgin menisci compared to arthroscopy.
- Post-arthroscopic meniscal repair, MRI showed persistent abnormal signal in four asymptomatic patients.
- MRI identified an unstable meniscal fragment in a patient with postoperative pain.
- MRI effectively evaluated meniscal degeneration, ossicles, cysts, and morphology.
Conclusions:
- MRI is a highly accurate noninvasive technique for diagnosing knee meniscal tears.
- MRI is valuable for assessing a wide range of meniscal pathologies.
- MRI is the diagnostic technique of choice for evaluating knee meniscal diseases.