The imaging features of the meniscal roots on isotropic 3D MRI in young asymptomatic volunteers

Wang, Ping; Zhang, Cheng-Zhou; Zhang, Di; Liu, Quanyuan; Zhong, Xiaofei; Yin, Zhijie; Wang, Bin

doi:10.1097/md.0000000000010624

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…describe that a partial radial tear of the MM posterior root (LaPrade arthroscopic/morphologic classification type 1 [ 11 ]) shows a fluid signal intensity at the root insertion and the subchondral and/or subenthesial linear bone marrow signal intensity on MRI [ 2 ]. However, the MM posterior root usually consists of multiple fiber bundles, typically exhibited as hyperintensity-/hypointensity-mixed signals (most of which are stripe-like signals) on MRI [ 12 ]. Many other meniscus tears at the MM posterior horn (horizontal, radial, and/or complex tears) show subcortical cystic lesions and/or posterior shiny-corner lesions (bone marrow lesions at the meniscal-covered portions of the tibial plateau) around the MM posterior root insertion [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

A characteristic MRI finding to diagnose a partial tear of the medial meniscus posterior root: an ocarina sign

Furumatsu

Hiranaka

Kintaka

et al. 2021

Knee Surg & Relat Res

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Background Diagnosing partial tears of the medial meniscus (MM) posterior root is difficult. The aim of this study was to evaluate diagnostic values involved in conventional magnetic resonance imaging (MRI) features of MM posterior root tears (MMPRTs) and find other MRI-based findings in patients with partial MMPRTs. Methods Eighteen patients who had arthroscopically confirmed partial MMPRTs were included. As a control, 18 patients who underwent partial meniscectomy for other types of MM tears were evaluated. Isolated partial MMPRTs were classified into the following three types: type A, accurate partial stable tear (cleavage < 1/2 of root width); type B, bridged unstable root tear (cleavage ≥ 1/2 of root width); type C, complex horn tear expanded to the root. Conventional MRI-based findings of MMPRTs were evaluated between two groups (n = 23). Posterior root irregularity, bone marrow spot, and ocarina-like appearance showing several condensed circles in triangular meniscal horn (ocarina sign) were also evaluated. Results Posterior root irregularity and bone marrow spot were frequently observed in the partial MMPRTs (47.8%), compared with the other MM tears (P = 0.007 and 0.023, respectively). The ocarina sign was detected in 69.6% of patients with partial MMPRTs. A significant difference between two groups was observed in a positive ratio of ocarina sign (P < 0.001). Types A, B, and C of the partial tear/damage were observed in three, eight, and seven patients, respectively. The ocarina sign was the most common MRI finding in each type of partial MMPRT. Conclusions This study demonstrated that a characteristic MRI finding, “ocarina sign,” was frequently observed in patients with partial tear/damage of the MM posterior root. The ocarina sign was the most common MRI finding in several types of partial MMPRTs. Our results suggest that the ocarina sign may be useful to diagnose unnoticed partial MMPRTs. Level of evidence: IV, retrospective comparative study.

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