Arthroscopy: The Journal of Arthroscopic & Related Surgery
Original ArticleMagnetic Resonance Imaging and Arthroscopic Findings of the Popliteomeniscal Fascicles With and Without Recurrent Subluxation of the Lateral Meniscus
Section snippets
Methods
The subjects of this study were 142 patients who visited our knee joint clinic between January 2007 and December 2008. More than half of the patients of the knee joint clinic were referred from other clinics, whereas the other patients were referred from other outpatient clinics in our hospital by our colleagues for possible need for surgical intervention. All patients of the knee joint clinic underwent radiographic and MRI examination of both knee joints. We included all of the patients of the
Results
Interobserver errors for sPMFs and iPMFs were 0.73 and 0.75, respectively. Intraobserver errors for sPMFs and iPMFs were 0.88 and 0.90, respectively.
The percentage of patients with the same type of sPMF classification on MRI between the right and left knee joints was 77%, whereas that for iPMF was 80%.
There was no significant difference in mean age among groups C, CR, and R in patients who underwent MRI or in those who underwent arthroscopy. There was no significant difference in mean age
Discussion
Our hypothesis that the asymptomatic knees contralateral to knees with RSLM exhibit the same percentage of abnormal PMFs as knees with RSLM was supported only in the case of sPMFs but not in that of iPMFs. The type of sPMF in the 2 knee joints in individuals was the same in 77% of cases, whereas that of iPMF was the same in 80%, indicating a high degree of agreement in PMF type between the 2 knee joints. This finding is consistent with the report of Tria et al.6 that the relation between the
Conclusions
A significantly high incidence of abnormal sPMFs was found in RSLM and contralateral knees. Thus abnormal sPMFs existed in both knee joints before patients had locking symptoms, suggesting that abnormal sPMFs may be required for locking symptoms. A significantly high incidence of abnormal iPMFs was found only in the knee joints with RSLM. An abnormal iPMF is thus the essential lesion to allow the at-risk lateral meniscus to become unstable beyond the rate of control knees.
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2017, Journal of Clinical Orthopaedics and TraumaCitation Excerpt :Mechanism behind dislocation of the lateral meniscus is still unclear. Two studies using MRI analysis for meniscal instability postulate that disruption of the popliteomeniscal fascicles between the lateral meniscus and popliteus may cause increased mobility of the meniscus.5,6 One report discussed posterior meniscular-capsular separation as a cause.4
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The authors report no conflict of interest.