A bilateral discoid medial meniscus with symptomatic intrasubstance cleavage tear

Song, Woo-Suk; Choi, Jun-Chul; Kim, Tae‐Hwan; Kim, Tae Hyun; Oh, Sae-Sook

doi:10.14517/aosm13002

Cited by 1 publication

(1 citation statement)

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“…Significantly larger sizes characterized the abnormal morphology of the oversized posterior segment medial meniscus at the mid-body and posterior segment, without a significant difference at the anterior segment compared to the normal group. Previous reports of a discoid medial meniscus pointed out “cupping” [ 26 , 27 ] of the medial tibial plateau on AP radiographs and the central indentation of the medial tibial plateau on sagittal MRI as characteristic imaging findings [ 28 ]. Similar to previous reports, all patients with discoid and oversized posterior segment medial menisci in our study indicated indentation of the medial tibial plateau on lateral radiographs and sagittal MRI.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment

Araki¹,

Tsubosaka

Muratsu³

et al. 2022

J Orthop Surg Res

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Background A discoid medial meniscus is rare in comparison with a discoid lateral meniscus. We encountered a new type of incomplete discoid with an oversized posterior segment. Therefore, this study aimed to report cases of medial meniscus with an oversized posterior segment and analyze the morphological characteristics by comparing them to cases with a discoid medial meniscus and normal medial meniscus. Methods Four patients with an oversized posterior segment medial meniscus (oversize group, mean age: 25.3 ± 12.0 years) and seven patients with a discoid medial meniscus (discoid group, mean age: 34.4 ± 19.6) were identified using magnetic resonance imaging (MRI) and diagnosed by arthroscopic findings in our hospital. Fifty patients without medial meniscal injury were retrospectively selected as the normal group (normal group, mean age: 24.0 ± 11.3 years). The clinical symptoms were examined. The anteroposterior (AP) length of both the anterior and posterior segments, AP length ratio of the posterior segment to the AP length of the medial tibial plateau, and mediolateral (ML) width of the mid-body of the medial meniscus were also evaluated using MRI and compared among the three groups. Results All patients in the oversize group complained of medial knee pain during deep knee flexion. In sagittal MRI, posteriorly deviated indentations were also observed at the medial tibial plateau in all cases in the oversize group. There was a significant difference in the AP length of the posterior segment between the normal and oversize groups (14.3 ± 2.8 vs. 23.6 ± 2.8 mm, P < 0.001), whereas there was no significant difference in the AP length of the anterior segment (9.1 ± 2.1 vs. 9.5 ± 1.9 mm, P = 0.869). The ML width of the mid-body in the normal, oversize, and discoid groups was 9.3 ± 1.8, 19.9 ± 2.6, and 25.8 ± 1.9 mm, respectively (normal vs. oversize group: P < 0.001, oversize vs discoid group: P = 0.01, normal vs. discoid group: P < 0.001). Conclusions Oversized posterior and normal anterior segments characterize this new type of incomplete discoid medial meniscus as a morphological abnormality.

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Section: Discussionmentioning

confidence: 99%