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Parameniscal cyst formation in the knee is associated with meniscal tear size: an MRI study
Chia-Chun Wu1, Yi-Chih Hsu, Ying-Chun Chiu
1Department of Orthopaedic Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
Background:
The relationship between meniscal tears and parameniscal cyst formation is contentious. We investigated whether the development of a parameniscal cyst is related to the size of the meniscal tear by using magnetic resonance imaging (MRI).
Methods:
On the basis of a retrospective review of an MRI database, we identified parameniscal cysts in 34 patients with adjacent meniscal tears extending to the meniscocapsular junction. The size of the meniscal tear was measured by dividing the length of the tear along two axes: circumferential and radial. We compared parameters, such as the size of the meniscal tear, the location of the tear, the pattern of each tear, and any associated ligamentous injury and intra-articular lesion, between the 34 patients and the 30 control patients who only had meniscal tears with torn components extending to the meniscocapsular junction.
Results:
Compared with the controls, patients with parameniscal cysts had significantly larger meniscal tears along the circumferential axis (P<0.001). A critical size of the meniscal tear along the circumferential axis of 12mm was associated with the formation of a parameniscal cyst.
Conclusions:
A larger meniscal tear extending into the meniscocapsular junction is more likely to be associated with the occurrence of a parameniscal cyst. The critical size of the meniscal tear, 12mm along the circumferential axis as identified using MRI, is a discrimination value for parameniscal cyst formation.
Level Of Evidence:
Level III.
Insights
Parameniscal cysts are linked to larger meniscal tears extending to the meniscocapsular junction. Magnetic resonance imaging (MRI) identified a critical tear size of 12mm along the circumferential axis as a predictor for cyst formation.
Area of Science:
- Orthopedic Surgery
- Radiology
- Sports Medicine
Background:
- The association between meniscal tears and parameniscal cyst development remains debated.
- Investigating the correlation between meniscal tear size and parameniscal cyst formation is crucial for clinical understanding.
Purpose of the Study:
- To determine if parameniscal cyst development is associated with the size of the adjacent meniscal tear.
- To identify a potential critical size threshold for meniscal tears that predisposes to parameniscal cyst formation using magnetic resonance imaging (MRI).
Main Methods:
- Retrospective review of an MRI database including 34 patients with parameniscal cysts and adjacent meniscal tears extending to the meniscocapsular junction.
- Measurement of meniscal tear size along circumferential and radial axes.
- Comparison of tear size, location, pattern, and associated injuries between patients with parameniscal cysts and 30 control patients with similar meniscal tears but no cysts.
Main Results:
- Patients with parameniscal cysts exhibited significantly larger meniscal tears along the circumferential axis compared to controls (P<0.001).
- A meniscal tear size of 12mm along the circumferential axis was identified as a critical threshold associated with parameniscal cyst formation.
Conclusions:
- Larger meniscal tears extending to the meniscocapsular junction are more likely to be associated with parameniscal cyst occurrence.
- A 12mm circumferential tear size, as determined by MRI, serves as a discriminatory value for predicting parameniscal cyst formation.
