Changes in the position of the medial meniscus owing to degenerative meniscus tears
Background: While meniscal extrusion has been recognized as a key factor in meniscal dysfunction and osteoarthritis (OA) development, the specific movement of the posterior horn of the medial meniscus (MM) during extrusion, particularly in early-stage OA, remains unexplored. Therefore, in this study...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-04-01
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| Series: | Asia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214687325000020 |
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| author | Tomoyuki Kanayama Yasushi Takata Yoshihiro Ishida Naoki Takemoto Manase Nishimura Satoru Demura Junsuke Nakase |
| author_facet | Tomoyuki Kanayama Yasushi Takata Yoshihiro Ishida Naoki Takemoto Manase Nishimura Satoru Demura Junsuke Nakase |
| author_sort | Tomoyuki Kanayama |
| collection | DOAJ |
| description | Background: While meniscal extrusion has been recognized as a key factor in meniscal dysfunction and osteoarthritis (OA) development, the specific movement of the posterior horn of the medial meniscus (MM) during extrusion, particularly in early-stage OA, remains unexplored. Therefore, in this study, we investigated the position of the MM in patients with medial knee pain and a Kellgren–Lawrence grade ≤1, investigating the relationship between meniscal extrusion and degenerative tears. We hypothesized that the MM extrusion (MME) would be larger when degenerative tears are present; the anterior horn would move posteriorly, and the posterior horn would move anteriorly, accordingly. Methods: A total of 181 knees (mean age 61.7 ± 12.1 years; 97 men and 84 women) were included. Simple radiographs were used to measure the weight-bearing line ratio and medial proximal tibia angle. Magnetic resonance imaging was used to measure the medial proximal tibia slope, medial meniscus extrusion, anterior and posterior horn position, and degenerative tears on the posterior segment of the medial meniscus. Those with degenerative tears were designated as group T and those without were designated as group C. Student's t-test and Pearson's χ2 test were performed to compare groups T and C. Statistical significance was set at p < 0.05. Results: Group T had a significantly larger medial posterior tibial slope (group T: 7.4 ± 2.3°; group C: 6.6 ± 2.2°, p = 0.010) and medial meniscus extrusion (group T: 2.7 ± 1.4 mm; group C: 1.9 ± 1.2 mm, p < 0.001) scores compared with group C. Furthermore, the posterior point of the anterior horn (group T: 16.3 ± 5.0 %; group C: 14.3 ± 3.8 %, p = 0.004) and anterior point of the posterior horn (group T: 36.4 ± 7.1 %; group C:26.9 ± 5.9 %, p < 0.001) were significantly larger in group T than in group C. Conclusion: Degenerative MM tears cause not only MME but also an anteroposterior shift. |
| format | Article |
| id | doaj-art-ec4979d976144a458ccfd53d01b9145c |
| institution | DOAJ |
| issn | 2214-6873 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Asia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology |
| spelling | doaj-art-ec4979d976144a458ccfd53d01b9145c2025-08-20T03:14:03ZengElsevierAsia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology2214-68732025-04-014071110.1016/j.asmart.2025.01.002Changes in the position of the medial meniscus owing to degenerative meniscus tearsTomoyuki Kanayama0Yasushi Takata1Yoshihiro Ishida2Naoki Takemoto3Manase Nishimura4Satoru Demura5Junsuke Nakase6Department of Orthopedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan 13-1 Takara-machi, Kanazawa-city, 920-8641, JapanDepartment of Orthopedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan 13-1 Takara-machi, Kanazawa-city, 920-8641, JapanDepartment of Orthopedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan 13-1 Takara-machi, Kanazawa-city, 920-8641, JapanDepartment of Orthopedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan 13-1 Takara-machi, Kanazawa-city, 920-8641, JapanDepartment of Orthopedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan 13-1 Takara-machi, Kanazawa-city, 920-8641, JapanDepartment of Orthopedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan 13-1 Takara-machi, Kanazawa-city, 920-8641, JapanCorresponding author.; Department of Orthopedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan 13-1 Takara-machi, Kanazawa-city, 920-8641, JapanBackground: While meniscal extrusion has been recognized as a key factor in meniscal dysfunction and osteoarthritis (OA) development, the specific movement of the posterior horn of the medial meniscus (MM) during extrusion, particularly in early-stage OA, remains unexplored. Therefore, in this study, we investigated the position of the MM in patients with medial knee pain and a Kellgren–Lawrence grade ≤1, investigating the relationship between meniscal extrusion and degenerative tears. We hypothesized that the MM extrusion (MME) would be larger when degenerative tears are present; the anterior horn would move posteriorly, and the posterior horn would move anteriorly, accordingly. Methods: A total of 181 knees (mean age 61.7 ± 12.1 years; 97 men and 84 women) were included. Simple radiographs were used to measure the weight-bearing line ratio and medial proximal tibia angle. Magnetic resonance imaging was used to measure the medial proximal tibia slope, medial meniscus extrusion, anterior and posterior horn position, and degenerative tears on the posterior segment of the medial meniscus. Those with degenerative tears were designated as group T and those without were designated as group C. Student's t-test and Pearson's χ2 test were performed to compare groups T and C. Statistical significance was set at p < 0.05. Results: Group T had a significantly larger medial posterior tibial slope (group T: 7.4 ± 2.3°; group C: 6.6 ± 2.2°, p = 0.010) and medial meniscus extrusion (group T: 2.7 ± 1.4 mm; group C: 1.9 ± 1.2 mm, p < 0.001) scores compared with group C. Furthermore, the posterior point of the anterior horn (group T: 16.3 ± 5.0 %; group C: 14.3 ± 3.8 %, p = 0.004) and anterior point of the posterior horn (group T: 36.4 ± 7.1 %; group C:26.9 ± 5.9 %, p < 0.001) were significantly larger in group T than in group C. Conclusion: Degenerative MM tears cause not only MME but also an anteroposterior shift.http://www.sciencedirect.com/science/article/pii/S2214687325000020Degenerative tearsMedial meniscus extrusionMeniscal tearsOsteoarthritis |
| spellingShingle | Tomoyuki Kanayama Yasushi Takata Yoshihiro Ishida Naoki Takemoto Manase Nishimura Satoru Demura Junsuke Nakase Changes in the position of the medial meniscus owing to degenerative meniscus tears Asia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology Degenerative tears Medial meniscus extrusion Meniscal tears Osteoarthritis |
| title | Changes in the position of the medial meniscus owing to degenerative meniscus tears |
| title_full | Changes in the position of the medial meniscus owing to degenerative meniscus tears |
| title_fullStr | Changes in the position of the medial meniscus owing to degenerative meniscus tears |
| title_full_unstemmed | Changes in the position of the medial meniscus owing to degenerative meniscus tears |
| title_short | Changes in the position of the medial meniscus owing to degenerative meniscus tears |
| title_sort | changes in the position of the medial meniscus owing to degenerative meniscus tears |
| topic | Degenerative tears Medial meniscus extrusion Meniscal tears Osteoarthritis |
| url | http://www.sciencedirect.com/science/article/pii/S2214687325000020 |
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