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Kandil K, Zaïri F, Zaïri F. Comprehensive analysis of damage evolution in human annulus fibrosus: Numerical exploration of mechanical sensitivity to biological age-dependent alteration. Comput Biol Med 2024; 182:109108. [PMID: 39276612 DOI: 10.1016/j.compbiomed.2024.109108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 08/12/2024] [Accepted: 09/02/2024] [Indexed: 09/17/2024]
Abstract
BACKGROUND AND OBJECTIVE The annulus fibrosus is an essential part of the intervertebral disc, critical for its structural integrity. Mechanical deterioration in this component can lead to complete disc failure, particularly through tears development, with radial tears being the most common. These tears are often the result of both mechanical and biological factors. This study aims to numerically investigate the mechanisms of radial failure in the annulus tissue, taking into account the mechanical and age-dependent biological damage origins. A newly developed microstructure-based model was upgraded to predict damage evolution in the different annulus regions. METHODS The study employs a computational model to predict mechanical failures in various annulus regions, using experimental data for comparison. The model incorporates age-dependent microstructural changes to evaluate the effects of biological aging on the mechanical behavior. It specifically includes a detailed analysis of the temporal changes in circumferential rigidity and failure strain of the annulus. RESULTS The model demonstrated a strong ability to replicate the experimental responses of the different annulus regions to failure. It revealed that age-related microstructural changes significantly impact the rigidity and failure response of the annulus, particularly in the posterior regions and as well the anterior inner side. These changes increase susceptibility to rupture with aging. A correlation was also observed between the composition of collagen fibers, water content, and the annulus transversal response in both radial and axial directions. CONCLUSION The findings challenge previous assumptions, showing that age-dependent microstructural changes have a notable effect on the annulus mechanical properties. The computational model closely aligns with experimental observations, underscoring the determinant role of oriented collagen fibers in radial failure. This study enhances the understanding of annulus failure and provides a foundation for further research on the impact of aging on disc mechanical integrity and failure.
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Affiliation(s)
- Karim Kandil
- Icam School of Engineering, Lille campus, 6 rue Auber, B.P. 10079, 59016, Lille, France; Univ. Lille, IMT Nord Europe, Univ. Artois, JUNIA, ULR 4515 - LGCgE, Laboratoire de Génie Civil et géo-Environnement, F-59000, Lille, France
| | - Fahmi Zaïri
- Univ. Lille, IMT Nord Europe, Univ. Artois, JUNIA, ULR 4515 - LGCgE, Laboratoire de Génie Civil et géo-Environnement, F-59000, Lille, France.
| | - Fahed Zaïri
- Ramsay Générale de Santé, Hôpital Privé Le Bois, 59000, Lille, France
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Meng Y, Liu W, Liu H, Yu C. Role of Embinin in the reabsorption of nucleus pulposus in lumbar disc herniation: Promotion of nucleus pulposus neovascularization and apoptosis of nucleus pulposus cells. Open Life Sci 2024; 19:20220878. [PMID: 38840893 PMCID: PMC11151393 DOI: 10.1515/biol-2022-0878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 03/26/2024] [Accepted: 04/29/2024] [Indexed: 06/07/2024] Open
Abstract
Reabsorption of the nucleus pulposus (NP) in lumbar disc herniation (LDH) refers to the natural absorption or even complete disappearance of LDH. In order to better treat LDH, it is necessary to further study its mechanism and develop new therapeutic drugs. Clematidis Radix Et Rhizoma is a ranunculus family plant which has multiple biological activities, and Embinin is one of its bioactive ingredients. However, its effects on LDH were unclear. In this study, the role of Embinin was investigated in LDH rat models. LDH model was established by lumbar epidural insertion of tail disc. Our results showed that Embinin promoted lumbar disc neovascularization, induced apoptosis of NP cells in LDH rats, and promoted lumbar disc resorption. Furthermore, mechanistic study showed that Embinin activated the cAMP pathway in the rat models. In conclusion, Embinin has the potential to serve as a drug for the treatment of LDH.
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Affiliation(s)
- Yingying Meng
- Department of Acupuncture and Moxibustion Massage, Wenzhou TCM Hospital of Zhejiang Chinese Medical University, Wenzhou, Zhejiang Province, 325000, China
| | - Wei Liu
- Department of Rehabilitation, Wenzhou TCM Hospital of Zhejiang Chinese Medical University, Wenzhou, Zhejiang Province, 325000, China
| | - Haifeng Liu
- Department of Orthopedics, Wenzhou TCM Hospital of Zhejiang Chinese Medical University, No. 9 Jiaowei Road, Lucheng District, Wenzhou, Zhejiang Province, 325000, China
| | - Chengwei Yu
- Department of Orthopedics, Wenzhou TCM Hospital of Zhejiang Chinese Medical University, No. 9 Jiaowei Road, Lucheng District, Wenzhou, Zhejiang Province, 325000, China
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Liu Q, Liang XF, Wang AG, Liu Y, Jia TJ, Li K, Zhang CQ. Failure mechanical properties of lumbar intervertebral disc under high loading rate. J Orthop Surg Res 2024; 19:15. [PMID: 38167031 PMCID: PMC10763340 DOI: 10.1186/s13018-023-04424-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 11/28/2023] [Indexed: 01/05/2024] Open
Abstract
BACKGROUND Lumbar disc herniation (LDH) is the main clinical cause of low back pain. The pathogenesis of lumbar disc herniation is still uncertain, while it is often accompanied by disc rupture. In order to explore relationship between loading rate and failure mechanics that may lead to lumbar disc herniation, the failure mechanical properties of the intervertebral disc under high rates of loading were analyzed. METHOD Bend the lumbar motion segment of a healthy sheep by 5° and compress it to the ultimate strength point at a strain rate of 0.008/s, making a damaged sample. Within the normal strain range, the sample is subjected to quasi-static loading and high loading rate at different strain rates. RESULTS For healthy samples, the stress-strain curve appears collapsed only at high rates of compression; for damaged samples, the stress-strain curves collapse both at quasi-static and high-rate compression. For damaged samples, the strengthening stage becomes significantly shorter as the strain rate increases, indicating that its ability to prevent the destruction is significantly reduced. For damaged intervertebral disc, when subjected to quasi-static or high rates loading until failure, the phenomenon of nucleus pulposus (NP) prolapse occurs, indicating the occurrence of herniation. When subjected to quasi-static loading, the AF moves away from the NP, and inner AF has the greatest displacement; when subjected to high rates loading, the AF moves closer to the NP, and outer AF has the greatest displacement. The Zhu-Wang-Tang (ZWT) nonlinear viscoelastic constitutive model was used to describe the mechanical behavior of the intervertebral disc, and the fitting results were in good agreement with the experimental curve. CONCLUSION Experimental results show that, both damage and strain rate have a significant effect on the mechanical behavior of the disc fracture. The research work in this article has important theoretical guiding significance for preventing LDH in daily life.
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Affiliation(s)
- Qing Liu
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, 300384, People's Republic of China
- National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, Tianjin University of Technology, Tianjin, 300354, People's Republic of China
- Department of Mechanics, Tianjin University, Tianjin, 300354, People's Republic of China
- Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin, 300354, People's Republic of China
| | - Xiao-Feng Liang
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, 300384, People's Republic of China
- National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, Tianjin University of Technology, Tianjin, 300354, People's Republic of China
| | - Ai-Guo Wang
- Affiliated Hospital of Tianjin Academia Sinica, Tianjin, 300120, People's Republic of China
| | - Ying Liu
- Affiliated Hospital of Tianjin Academia Sinica, Tianjin, 300120, People's Republic of China
| | - Tong-Ju Jia
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, 300384, People's Republic of China
- National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, Tianjin University of Technology, Tianjin, 300354, People's Republic of China
| | - Kun Li
- Tianjin Key Laboratory of Film Electronic and Communication Device, Tianjin University of Technology, Tianjin, 300384, People's Republic of China.
| | - Chun-Qiu Zhang
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, 300384, People's Republic of China
- National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, Tianjin University of Technology, Tianjin, 300354, People's Republic of China
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