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Meniscal tears of the knee: accuracy of MR imaging
Abstract:
Before surgery, 277 menisci in 144 knees were examined with magnetic resonance (MR) imaging. They were then examined directly with arthroscopy or arthrotomy. Menisci were graded on a scale of 1-3 according to the character of the intrameniscal MR imaging signal. At surgery, 137 of 154 (89%) menisci exhibiting only grade 1 or grade 2 signal were found to be normal. One hundred sixteen of 123 (94%) menisci exhibiting intrameniscal signal communicating with a meniscal articular surface (grade 3 signal) had tears. If only a grade 3 signal is considered consistent with meniscal tears, then MR findings and surgical findings agreed in 91.3% of menisci. MR imaging can separate surgically significant from nonsignificant meniscal lesions and is useful in the noninvasive preoperative screening of suspected meniscal tears.
Insights
Magnetic resonance (MR) imaging effectively differentiates significant meniscal tears from normal menisci. This noninvasive technique aids in preoperative screening for knee injuries, improving diagnostic accuracy before surgery.
Area of Science:
- Orthopedics
- Radiology
- Sports Medicine
Background:
- Meniscal tears are common knee injuries requiring accurate diagnosis.
- Preoperative assessment of meniscal integrity is crucial for surgical planning.
- Magnetic resonance (MR) imaging is a key noninvasive diagnostic tool.
Purpose of the Study:
- To evaluate the accuracy of magnetic resonance (MR) imaging in diagnosing meniscal tears.
- To determine if MR imaging can differentiate between surgically significant and insignificant meniscal lesions.
- To assess the utility of MR imaging in preoperative screening for suspected meniscal tears.
Main Methods:
- Prospective study involving 277 menisci in 144 knees.
- Preoperative magnetic resonance (MR) imaging with grading of intrameniscal signal (1-3).
- Direct surgical examination (arthroscopy or arthrotomy) for definitive diagnosis.
Main Results:
- Grade 1 or 2 MR signal indicated normal menisci in 89% of cases (137/154).
- Grade 3 MR signal (communicating with articular surface) correctly identified tears in 94% of cases (116/123).
- Overall agreement between MR imaging and surgical findings was 91.3% when considering grade 3 signal indicative of tears.
Conclusions:
- Magnetic resonance (MR) imaging is a valuable tool for noninvasive preoperative screening of suspected meniscal tears.
- MR imaging can reliably distinguish between surgically significant and nonsignificant meniscal lesions.
- The grading system based on intrameniscal signal characterization improves diagnostic precision.