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

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

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 chara...

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Bibliographic Details
Published in:Journal of orthopaedic surgery and research Vol. 17; no. 1; p. 245
Main Authors: Araki, Shotaro, Tsubosaka, Masanori, Muratsu, Hirotsugu, Inokuchi, Takao, Maruo, Hiroaki, Miya, Hidetoshi, Kuroda, Ryosuke, Matsushita, Takehiko
Format: Journal Article
Language:English
Published: England BioMed Central Ltd 20-04-2022
BioMed Central
BMC
Subjects:
Adolescent
Adult
Age
Arthroscopy
Cartilage Diseases
Child
Dimensional analysis
Discoid
Humans
Joint Diseases
Knee
Knee Joint - surgery
Lower Extremity Deformities, Congenital
Magnetic Resonance Imaging
Medial meniscus
Medical research
Medicine, Experimental
Menisci, Tibial - diagnostic imaging
Menisci, Tibial - surgery
Meniscus
Middle Aged
Morphological characteristic
Morphology
Orthopedics
Oversize posterior segment
Pain
Patients
Physical characteristics
Retrospective Studies
Young Adult
Discoid
Morphological characteristic
Oversize posterior segment
Medial meniscus
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Summary: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. 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. 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). Oversized posterior and normal anterior segments characterize this new type of incomplete discoid medial meniscus as a morphological abnormality.
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ISSN:1749-799X
1749-799X
DOI:10.1186/s13018-022-03132-2