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Evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment
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 morphol...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9022343/ https://www.ncbi.nlm.nih.gov/pubmed/35443728 http://dx.doi.org/10.1186/s13018-022-03132-2 |
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author | Araki, Shotaro Tsubosaka, Masanori Muratsu, Hirotsugu Inokuchi, Takao Maruo, Hiroaki Miya, Hidetoshi Kuroda, Ryosuke Matsushita, Takehiko |
author_facet | Araki, Shotaro Tsubosaka, Masanori Muratsu, Hirotsugu Inokuchi, Takao Maruo, Hiroaki Miya, Hidetoshi Kuroda, Ryosuke Matsushita, Takehiko |
author_sort | Araki, Shotaro |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-9022343 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-90223432022-04-22 Evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment Araki, Shotaro Tsubosaka, Masanori Muratsu, Hirotsugu Inokuchi, Takao Maruo, Hiroaki Miya, Hidetoshi Kuroda, Ryosuke Matsushita, Takehiko J Orthop Surg Res Research Article 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. BioMed Central 2022-04-20 /pmc/articles/PMC9022343/ /pubmed/35443728 http://dx.doi.org/10.1186/s13018-022-03132-2 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visithttp://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/ (https://creativecommons.org/publicdomain/zero/1.0/) ) applies to the data made available in this article, unless otherwise stated in a credit line to the data. |
spellingShingle | Research Article Araki, Shotaro Tsubosaka, Masanori Muratsu, Hirotsugu Inokuchi, Takao Maruo, Hiroaki Miya, Hidetoshi Kuroda, Ryosuke Matsushita, Takehiko Evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment |
title | Evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment |
title_full | Evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment |
title_fullStr | Evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment |
title_full_unstemmed | Evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment |
title_short | Evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment |
title_sort | evaluation of morphological characteristics for incomplete discoid medial meniscus with an oversized posterior segment |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9022343/ https://www.ncbi.nlm.nih.gov/pubmed/35443728 http://dx.doi.org/10.1186/s13018-022-03132-2 |
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