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MRI characteristics of healed and unhealed peripheral vertical meniscal tears
Richard Kijowski1, Humberto G Rosas, Kenneth S Lee
11 Department of Radiology, University of Wisconsin, 600 Highland Ave, Clinical Science Center E3/311, Madison, WI 53792-3252.
Objective:
The objective of our study was to retrospectively compare the MRI characteristics of surgically confirmed healed and unhealed peripheral vertical meniscal tears.
Materials And Methods:
The study group consisted of 64 patients with 86 peripheral vertical meniscal tears diagnosed on MRI who subsequently underwent knee surgery. The MRI examinations were retrospectively reviewed to assess the following tear characteristics: tear location relative to the meniscocapsular junction, tear width, tear length, tear extension through one or both surfaces, sequences on which tear was visualized, signal intensity of tear on T2-weighted imaging, and presence of low-signal-intensity strands bridging the tear on T2-weighted imaging. Multivariate logistic regression models were used to determine whether MRI characteristics could be used to distinguish between healed and unhealed tears at surgery.
Results:
Tear location was the most significant characteristic (p<0.001) for distinguishing between healed and unhealed tears: 17 of 18 (94.4%) tears located at the meniscocapsular junction of the medial meniscus were healed and 15 of 68 (22.1%) tears not located at the meniscocapsular junction were healed. For tears not located at the meniscocapsular junction, MRI characteristics significantly associated with healed tears included a tear width of less than 2 mm (p=0.01), tear visualized only on intermediate-weighted imaging (p=0.01), tear showing intermediate or bright signal intensity on T2-weighted imaging (p=0.06), and low-signal-intensity strands bridging the tear on T2-weighted imaging (p<0.001).
Conclusion:
Most peripheral vertical tears at the meniscocapsular junction of the medial meniscus spontaneously heal. The MRI characteristics of tears not located at the meniscocapsular junction can help distinguish between healed and unhealed tears.
Insights
Peripheral vertical meniscal tears at the medial meniscus
Area of Science:
- Orthopedic imaging
- Knee MRI analysis
- Meniscal tear healing
Background:
- Peripheral vertical meniscal tears are common knee injuries.
- Assessing spontaneous healing of these tears is crucial for treatment decisions.
- Magnetic Resonance Imaging (MRI) is a key diagnostic tool for meniscal pathology.
Purpose of the Study:
- To retrospectively compare MRI characteristics of healed versus unhealed peripheral vertical meniscal tears.
- To identify specific MRI features that predict meniscal tear healing.
- To evaluate the utility of MRI in distinguishing between surgically confirmed healed and unhealed meniscal tears.
Main Methods:
- Retrospective review of 86 peripheral vertical meniscal tears in 64 patients diagnosed by MRI and confirmed surgically.
- Assessment of MRI characteristics including tear location, width, length, surface extension, visualization sequences, and signal intensity.
- Multivariate logistic regression analysis to correlate MRI findings with surgical outcomes (healed vs. unhealed tears).
Main Results:
- Tear location is the most significant predictor of healing (p<0.001).
- Tears at the meniscocapsular junction of the medial meniscus showed a high healing rate (94.4%).
- For tears not at the meniscocapsular junction, healed tears were associated with smaller width (<2 mm), visualization on intermediate-weighted imaging, intermediate/bright T2 signal, and bridging low-signal strands.
Conclusions:
- Peripheral vertical tears at the meniscocapsular junction of the medial meniscus frequently heal spontaneously.
- Specific MRI characteristics can aid in differentiating healed from unhealed peripheral vertical meniscal tears, particularly those not at the meniscocapsular junction.
