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Kaneguchi A, Ozawa J, Minamimoto K, Yamaoka K. The Natural History of Medial Meniscal Tears in the ACL Deficient and ACL Reconstructed Rat Knee. Cartilage 2021; 13:1570S-1582S. [PMID: 34024166 PMCID: PMC8804834 DOI: 10.1177/19476035211014588] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
OBJECTIVE The process of anterior cruciate ligament (ACL) injury-induced meniscal tear formation is not fully understood. Clinical studies have shown that ACL reconstruction (ACLR) reduces the development of secondary meniscal tears, but it is difficult to gain insight into the protective effects of ACLR from clinical studies alone. Using rat ACL transection (ACLT) and ACLR models, we aimed to reveal (1) the formation process of meniscal tears secondary to ACLT and (2) the protective effects of ACLR on secondary meniscal tears. DESIGN ACLT surgery alone or with ACLR was performed on the knees of rats. Histomorphological and histopathological changes were examined in the posteromedial region of the meniscus in intact rats and in rats that received ACLT or ACLR up to 12 weeks postsurgery. In addition, anterior-posterior joint laxity was measured using the universal testing machine to evaluate the effects of ACLT and ACLR on joint laxity. RESULTS AAnterior-posterior laxity was significantly increased by ACLT compared to the intact knee. This ACLT-induced joint laxity was partially but significantly reduced by ACLR. Meniscal proliferation and hyaline cartilage-like tissue formation were detected in the medial meniscus at 4 weeks post-ACLT. At 12 weeks post-ACLT, hyaline cartilage-like tissue was replaced by ossicles and meniscal tears were observed. These ACLT-induced abnormalities were attenuated by ACLR. CONCLUSIONS Our results suggest that ACLT-induced joint laxity induces secondary medial meniscal tears through meniscal proliferation and ossicle formation via endochondral ossification. Joint re-stabilization by ACLR suppresses meniscal proliferation and ossicle formation and consequently prevents secondary meniscal tears.
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Affiliation(s)
- Akinori Kaneguchi
- Department of Rehabilitation, Faculty
of Rehabilitation, Hiroshima International University, Higashi-Hiroshima, Hiroshima,
Japan
| | - Junya Ozawa
- Department of Rehabilitation, Faculty
of Rehabilitation, Hiroshima International University, Higashi-Hiroshima, Hiroshima,
Japan,Junya Ozawa, Department of Rehabilitation,
Faculty of Rehabilitation, Hiroshima International University, Kurose-Gakuendai
555-36, Higashi-Hiroshima, Hiroshima 739-2695, Japan.
| | - Kengo Minamimoto
- Major in Medical Engineering and
Technology, Graduate School of Medical Technology and Health Welfare Sciences,
Hiroshima International University, Higashi-Hiroshima, Hiroshima, Japan
| | - Kaoru Yamaoka
- Department of Rehabilitation, Faculty
of Rehabilitation, Hiroshima International University, Higashi-Hiroshima, Hiroshima,
Japan
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Rolin GL, Binda D, Tissot M, Viennet C, Saas P, Muret P, Humbert P. In vitro study of the impact of mechanical tension on the dermal fibroblast phenotype in the context of skin wound healing. J Biomech 2014; 47:3555-61. [PMID: 25267573 DOI: 10.1016/j.jbiomech.2014.07.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 07/17/2014] [Accepted: 07/22/2014] [Indexed: 12/26/2022]
Abstract
Skin wound healing is finely regulated by both matrix synthesis and degradation which are governed by dermal fibroblast activity. Actually, fibroblasts synthesize numerous extracellular matrix proteins (i.e., collagens), remodeling enzymes and their inhibitors. Moreover, they differentiate into myofibroblasts and are able to develop endogenous forces at the wound site. Such forces are crucial during skin wound healing and have been widely investigated. However, few studies have focused on the effect of exogenous mechanical tension on the dermal fibroblast phenotype, which is the objective of the present paper. To this end, an exogenous, defined, cyclic and uniaxial mechanical strain was applied to fibroblasts cultured as scratch-wounded monolayers. Results showed that fibroblasts' response was characterized by both an increase in procollagen type-I and TIMP-1 synthesis, and a decrease in MMP-1 synthesis. The monitoring of scratch-wounded monolayers did not show any decrease in kinetics of the filling up when mechanical tension was applied. Additional results obtained with proliferating fibroblasts and confluent monolayer indicated that mechanical tension-induced response of fibroblasts depends on their culture conditions. In conclusion, mechanical tension leads to the differentiation of dermal fibroblasts and may increase their wound-healing capacities. So, the exogenous uniaxial and cyclic mechanical tension reported in the present study may be considered in order to improve skin wound healing.
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Affiliation(s)
- Gwenae L Rolin
- University Hospital of Besançon, Clinical Investigation Center, 2 Place St. Jacques, Inserm 1431, Besançon 25000, France; Inserm UMR 1098, Engineering and Cutaneous Biology team, Besançon, France; Université de Franche-Comté, Besançon, France; EFS Bourgogne Franche-Comté, Besançon, France; SFR FED 4234, France.
| | - Delphine Binda
- University Hospital of Besançon, Clinical Investigation Center, 2 Place St. Jacques, Inserm 1431, Besançon 25000, France; EFS Bourgogne Franche-Comté, Besançon, France; SFR FED 4234, France
| | - Marion Tissot
- Inserm UMR 1098, Engineering and Cutaneous Biology team, Besançon, France; Université de Franche-Comté, Besançon, France; EFS Bourgogne Franche-Comté, Besançon, France; SFR FED 4234, France
| | - Céline Viennet
- Inserm UMR 1098, Engineering and Cutaneous Biology team, Besançon, France; Université de Franche-Comté, Besançon, France; EFS Bourgogne Franche-Comté, Besançon, France; SFR FED 4234, France
| | - Philippe Saas
- University Hospital of Besançon, Clinical Investigation Center, 2 Place St. Jacques, Inserm 1431, Besançon 25000, France; Inserm UMR 1098, Engineering and Cutaneous Biology team, Besançon, France; Université de Franche-Comté, Besançon, France; University Hospital of Besançon, Department of Dermatology, Besançon, France; EFS Bourgogne Franche-Comté, Besançon, France; SFR FED 4234, France
| | - Patrice Muret
- Inserm UMR 1098, Engineering and Cutaneous Biology team, Besançon, France; Université de Franche-Comté, Besançon, France; EFS Bourgogne Franche-Comté, Besançon, France; SFR FED 4234, France
| | - Philippe Humbert
- Inserm UMR 1098, Engineering and Cutaneous Biology team, Besançon, France; Université de Franche-Comté, Besançon, France; University Hospital of Besançon, Department of Dermatology, Besançon, France; EFS Bourgogne Franche-Comté, Besançon, France; SFR FED 4234, France
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