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Chen X, Xue C, Li K, Mu K, Yao C, Wang Z, Chen H, Zhang J. Finite element analysis of anterior cruciate ligament reconstruction techniques: A comparison of the mechanical properties of all-inside fixation and traditional fixation. Front Bioeng Biotechnol 2024; 12:1438839. [PMID: 39157441 PMCID: PMC11327044 DOI: 10.3389/fbioe.2024.1438839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2024] [Accepted: 07/19/2024] [Indexed: 08/20/2024] Open
Abstract
Objective The main purpose of this study was to explore the mechanical properties of the anterior cruciate ligament and its attachments following reconstruction with the all-inside technique after anterior cruciate ligament injury. Methods Knee joint computed tomography data were collected from healthy volunteers, and knee joint models were created using Mimics software. A normal knee joint model, an all-inside reconstructed anterior cruciate ligament model, and a traditional reconstructed anterior cruciate ligament model were established. A tensile force of 134 N and a bending moment of 5 N/m were applied at the anterior aspect of the proximal tibia in these three models. The knee joint was subjected to external rotation, internal rotation, varus, valgus, flexion, and extension under this bending moment. The magnitude and distribution of stress on the ligament or graft and the magnitude and distribution of stress on the graft attachments were observed under different loading conditions. Results Under different external forces, the maximum stress on the ligament in the normal model fluctuated from 1.949 to 18.302 MPa, with an uncertain distribution of maximum stress. The maximum stress on the graft in the all-inside reconstructed anterior cruciate ligament model fluctuated from 0.705 to 3.465 MPa and was mainly distributed at the junction of the graft and the tibial footprint. In the traditional reconstructed anterior cruciate ligament model, the maximum stress on the graft fluctuated from 5.012 to 59.269 MPa and was primarily distributed at the junction of the interference screw and the graft. The concentration of stress on the loop and plate in the all-inside reconstructed anterior cruciate ligament model fluctuated from 70.461 to 346.363 MPa, with maximum stress distributed at the junction of the loop and the tibial surface. The maximum stress on the interference screw in the traditional reconstructed anterior cruciate ligament model fluctuated from 10.184 to 92.298 MPa, with maximum stress primarily distributed at the end of the interference screw. Conclusion Under different external forces, the graft used in all-inside anterior cruciate ligament reconstruction is subjected to fewer external forces than that used in traditional anterior cruciate ligament reconstruction, which may indicate a relatively stable mechanical environment. The strength of the loop and plate can theoretically tolerate daily knee joint movements of patients without injury.
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Affiliation(s)
- Xiaodong Chen
- Anhui Key Laboratory of Tissue Transformation, Department of Orthopedics, The First Affiliated Hospital of Bengbu Medical University, Bengbu Medical University, Bengbu, Anhui, China
| | - Changguo Xue
- School of Material Science and Engineering, Anhui University of Science and Technology, Huainan, China
| | - Kuanxin Li
- Anhui Key Laboratory of Tissue Transformation, Department of Orthopedics, The First Affiliated Hospital of Bengbu Medical University, Bengbu Medical University, Bengbu, Anhui, China
| | - Kecheng Mu
- Anhui Key Laboratory of Tissue Transformation, Department of Orthopedics, The First Affiliated Hospital of Bengbu Medical University, Bengbu Medical University, Bengbu, Anhui, China
| | - Cheng Yao
- Department of Orthopedics, The Third People’s Hospital of Bengbu, Bengbu, China
| | - Zhiyan Wang
- Anhui Key Laboratory of Tissue Transformation, Department of Orthopedics, The First Affiliated Hospital of Bengbu Medical University, Bengbu Medical University, Bengbu, Anhui, China
| | - Hongzhi Chen
- Department of Radiology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Jun Zhang
- Department of Orthopedics, The First People’s Hospital of Bengbu, Bengbu, China
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Halloran JP, Abdollahi Nohouji N, Hafez MA, Besier TF, Chokhandre SK, Elmasry S, Hume DR, Imhauser CW, Rooks NB, Schneider MTY, Schwartz A, Shelburne KB, Zaylor W, Erdemir A. Assessment of reporting practices and reproducibility potential of a cohort of published studies in computational knee biomechanics. J Orthop Res 2023; 41:325-334. [PMID: 35502762 PMCID: PMC9630164 DOI: 10.1002/jor.25358] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 03/22/2022] [Accepted: 04/20/2022] [Indexed: 02/04/2023]
Abstract
Reproducible research serves as a pillar of the scientific method and is a foundation for scientific advancement. However, estimates for irreproducibility of preclinical science range from 75% to 90%. The importance of reproducible science has not been assessed in the context of mechanics-based modeling of human joints such as the knee, despite this being an area that has seen dramatic growth. Framed in the context of five experienced teams currently documenting knee modeling procedures, the aim of this study was to evaluate reporting and the perceived potential for reproducibility across studies the teams viewed as important contributions to the literature. A cohort of studies was selected by polling, which resulted in an assessment of nine studies as opposed to a broader analysis across the literature. Using a published checklist for reporting of modeling features, the cohort was evaluated for both "reporting" and their potential to be "reproduced," which was delineated into six major modeling categories and three subcategories. Logistic regression analysis revealed that for individual modeling categories, the proportion of "reported" occurrences ranged from 0.31, 95% confidence interval (CI) [0.23, 0.41] to 0.77, 95% CI: [0.68, 0.86]. The proportion of whether a category was perceived as "reproducible" ranged from 0.22, 95% CI: [0.15, 0.31] to 0.44, 95% CI: [0.35, 0.55]. The relatively low ratios highlight an opportunity to improve reporting and reproducibility of knee modeling studies. Ongoing efforts, including our findings, contribute to a dialogue that facilitates adoption of practices that provide both credibility and translation possibilities.
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Affiliation(s)
- Jason P Halloran
- Applied Sciences Laboratory, Institute for Shock Physics, Washington State University, Spokane, WA, USA,Corresponding author: Applied Sciences Laboratory, Institute for Shock Physics, 412 E Spokane Falls Blvd, Spokane, WA 99202, Phone: 509-358-7713,
| | - Neda Abdollahi Nohouji
- Center for Human Machine Systems, Cleveland State University, Cleveland, OH, USA,Department of Mechanical Engineering, Cleveland State University, Cleveland, OH, USA,Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OHIO, USA
| | - Mhd Ammar Hafez
- Center for Human Machine Systems, Cleveland State University, Cleveland, OH, USA,Department of Civil Engineering, Cleveland State University, Cleveland, OH, USA
| | - Thor F Besier
- Auckland Bioengineering Institute, University of Auckland, Auckland, NZ,Department of Engineering Science, Faculty of Engineering, University of Auckland, Auckland, NZ
| | - Snehal K Chokhandre
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OHIO, USA,Computational Biomodeling (CoBi) Core, Lerner Research Institute, Cleveland Clinic, USA
| | - Shady Elmasry
- Department of Biomechanics, Hospital for Special Surgery, New York, NY, USA
| | - Donald R Hume
- Department of Mechanical and Materials Engineering, University of Denver, Denver, CO, USA,Center for Orthopaedic Biomechanics, University of Denver, Denver, CO, USA
| | - Carl W Imhauser
- Department of Biomechanics, Hospital for Special Surgery, New York, NY, USA
| | - Nynke B Rooks
- Auckland Bioengineering Institute, University of Auckland, Auckland, NZ
| | | | - Ariel Schwartz
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OHIO, USA,Computational Biomodeling (CoBi) Core, Lerner Research Institute, Cleveland Clinic, USA
| | - Kevin B Shelburne
- Department of Mechanical and Materials Engineering, University of Denver, Denver, CO, USA,Center for Orthopaedic Biomechanics, University of Denver, Denver, CO, USA
| | - William Zaylor
- Center for Human Machine Systems, Cleveland State University, Cleveland, OH, USA,Department of Mechanical Engineering, Cleveland State University, Cleveland, OH, USA
| | - Ahmet Erdemir
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OHIO, USA,Computational Biomodeling (CoBi) Core, Lerner Research Institute, Cleveland Clinic, USA
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Adouni M, Faisal T, Dhaher Y. Effect of Surgical Design Variations on the Knee Contact Behavior during Anterior Cruciate Ligament Reconstruction. J Knee Surg 2023; 36:310-321. [PMID: 34375997 DOI: 10.1055/s-0041-1733879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In this study, we aimed to develop an in-silico synthesis of the effect of critical surgical design parameters on articular contact behavior for a bone-patellar-tendon-bone anterior cruciate ligament reconstruction (ACL-R) surgery. A previously developed finite element model of the knee joint consisting of all relevant soft tissues was employed. The knee model was further updated with additional features to develop the parametric FE model of the biomechanical experiments that depicted the ACL-R surgery. The parametricity was created involving femoral tunnel architecture (orientations and locations) and graft fixation characteristics (pretension and angle of fixation). A global sensitivity analysis based on variance decomposition was used to investigate the contribution of the surgical parameters to the uncertainty in response to the ACL-R joint. Our examinations indicated that the total contact force was primarily influenced by either combined or individual action of the graft pretension and fixation angle, with a modest contribution of the graft insertion sites. The joint contact center and area were affected mainly by the angle of fixation and the tunnel placements. Graft pretension played the dominant role in the maximum contact pressure variability, an observation that has been well-documented in the literature. Interestingly, the joint contact behavior was almost insensitive to the tunnel's coronal and sagittal orientations. Our data provide an evaluation of how the surgical parameters affect the knee joint's contact behavior after ACL-R and may provide additional information to better explain the occurrence of osteoarthritis as an aftermath of such surgery.
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Affiliation(s)
- Malek Adouni
- Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, Illinois.,Department of Mechanical Engineering, Australian College of Kuwait, Kuwait City, Kuwait
| | - Tanvir Faisal
- Department of Bioengineering, University of Texas Southwest, Dallas, Texas
| | - Yasin Dhaher
- Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, Illinois.,Department of Mechanical Engineering, University of Louisiana at Lafayette, Louisiana.,Department of Physical Medicine and Rehabilitation, University of Texas Southwest, Dallas, Texas.,Department of Orthopedic Surgery, University of Texas Southwest, Dallas, Texas
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Faisal TR, Adouni M, Dhaher YY. Surrogate modeling of articular cartilage degradation to understand the synergistic role of MMP-1 and MMP-9: a case study. Biomech Model Mechanobiol 2023; 22:43-56. [PMID: 36201069 DOI: 10.1007/s10237-022-01630-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Accepted: 08/22/2022] [Indexed: 11/26/2022]
Abstract
A characteristic feature of arthritic diseases is cartilage extracellular matrix (ECM) degradation, often orchestrated by the overexpression of matrix metalloproteinases (MMPs) and other proteases. The interplay between fibril level degradation and the tissue-level aggregate response to biomechanical loading was explored in this work by a computational multiscale cartilaginous model. We considered the relative abundance of collagenases (MMP-1) and gelatinases (MMP-9) in surrogate models, where the diffusion (spatial distribution) of these enzymes and the subsequent, co-localized fibrillar damage were spatially randomized with Latin Hypercube Sampling. The computational model was constructed by incorporating the results from prior molecular dynamics simulations (tensile test) of microfibril degradation into a hyper-elastoplastic fibril-reinforced cartilage model. Including MMPs-mediated collagen fibril-level degradation in computational models may help understand the ECM pathomechanics at the tissue level. The mechanics of cartilage tissue and fibril show variations in mechanical integrity depending on the different combinations of MMPs-1 and 9 with a concentration ratio of 1:1, 3:1, and 1:3 in simulated indentation tests. The fibril yield (local failure) was initiated at 20.2 ± 3.0 (%) and at 23.0 ± 2.8 (%) of bulk strain for col 1:gel 3 and col 3: gel 1, respectively. The reduction in failure stress (global response) was 39.8% for col 1:gel 3, 37.5% for col 1:gel 1, and 36.7% for col 3:gel 1 compared with the failure stress of the degradation free tissue. These findings indicate that cartilage's global and local mechanisms of failure largely depend on the relative abundance of the two key enzymes-collagenase (MMP-1) and gelatinase (MMP-9) and the spatial characteristics of diffusion across the layers of the cartilage ECM.
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Affiliation(s)
- Tanvir R Faisal
- Department of Mechanical Engineering, University of Louisiana at Lafayette, Lafayette, LA, 70508, USA.
| | - Malek Adouni
- Department of Mechanical Engineering, Australian College of Kuwait, East Mishref, Kuwait City, P.O. Box 1411, Kuwait
| | - Yasin Y Dhaher
- Department of Physical Medicine and Rehabilitation, University of Texas Southwest, Dallas, TX, USA
- Department of Orthopedic Surgery, University of Texas Southwest, Dallas, TX, USA
- Department of Biomedical Engineering, University of Texas Southwest, Dallas, TX, USA
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Chokhandre S, Schwartz A, Klonowski E, Landis B, Erdemir A. Open Knee(s): A Free and Open Source Library of Specimen-Specific Models and Related Digital Assets for Finite Element Analysis of the Knee Joint. Ann Biomed Eng 2023; 51:10-23. [PMID: 36104640 PMCID: PMC9832097 DOI: 10.1007/s10439-022-03074-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 09/04/2022] [Indexed: 01/28/2023]
Abstract
There is a growing interest in the use of virtual representations of the knee for musculoskeletal research and clinical decision making, and to generate digital evidence for design and regulation of implants. Accessibility to previously developed models and related digital assets can dramatically reduce barriers to entry to conduct simulation-based studies of the knee joint and therefore help accelerate scientific discovery and clinical innovations. Development of models for finite element analysis is a demanding process that is both time consuming and resource intensive. It necessitates expertise to transform raw data to reliable virtual representations. Modeling and simulation workflow has many processes such as image segmentation, surface geometry generation, mesh generation and finally, creation of a finite element representation with relevant loading and boundary conditions. The outcome of the workflow is not only the end-point knee model but also many other digital by-products. When all of these data, derivate assets, and tools are freely and openly accessible, researchers can bypass some or all the steps required to build models and focus on using them to address their research goals. With provenance to specimen-specific anatomical and mechanical data and traceability of digital assets throughout the whole lifecycle of the model, reproducibility and credibility of the modeling practice can be established. The objective of this study is to disseminate Open Knee(s), a cohort of eight knee models (and relevant digital assets) for finite element analysis, that are based on comprehensive specimen-specific imaging data. In addition, the models and by-products of modeling workflows are described along with model development strategies and tools. Passive flexion served as a test simulation case, demonstrating an end-user application. Potential roadmaps for reuse of Open Knee(s) are also discussed.
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Affiliation(s)
- Snehal Chokhandre
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Ariel Schwartz
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Ellen Klonowski
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Benjamin Landis
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Ahmet Erdemir
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA.
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Adouni M, Faisal TR, Dhaher YY. Sensitivity analysis of the knee ligament forces to the surgical design variation during anterior cruciate ligament reconstruction: a finite element analysis. Comput Methods Biomech Biomed Engin 2021; 25:1063-1071. [PMID: 34821520 DOI: 10.1080/10255842.2021.2006647] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The purpose of this study is to understand the effect of essential surgical design parameters on collateral and cruciate ligaments behavior for a Bone-Patellar-Tendon-Bone (BPTB) anterior cruciate ligament reconstruction (ACL-R) surgery. A parametric finite element model of biomechanical experiments depicting the ACL-R surgery associated with a global sensitivity analysis was adopted in this work. The model parameters were six intraoperative variables, two-quadrant coordinates of femoral tunnel placement, femoral tunnel sagittal and coronal angles, graft pretension, and the joint angle at which the BPTB graft is tensioned (fixation angle). Our results indicated that cruciate ligaments (posterior cruciate ligament (PCL) and graft) were mainly sensitive to graft pretension (23%), femoral tunnel sites (56%), and the angle at which the surgeon decided to fix the graft (14%). The collateral ligaments (medial and lateral) were also affected by the same set of surgical parameters as the cruciate ligaments except for graft pretension. The output data of this study may help to identify a better role for the ACL-R intraoperative variables in optimizing the knee joint ligaments' postsurgical functionality.
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Affiliation(s)
- Malek Adouni
- Physical Medicine and Rehabilitation Department, Northwestern University, Chicago, IL, USA.,Mechanical Engineering department, Australian College of Kuwait, Kuwait City, Kuwait
| | - Tanvir R Faisal
- Department of Mechanical Engineering, University of Louisiana at Lafayette, Lafayette, LA, USA
| | - Yasin Y Dhaher
- Physical Medicine and Rehabilitation Department, Northwestern University, Chicago, IL, USA.,Department of Physical Medicine and Rehabilitation, University of Texas Southwest, Dallas, TX, USA.,Department of Orthopedic Surgery, University of Texas Southwest, Dallas, TX, USA.,Bioengineering, University of Texas Southwest, Dallas, TX, USA
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7
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Adouni M, Mbarki R, Al Khatib F, Eilaghi A. Multiscale modeling of knee ligament biomechanics. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2021; 37:e3413. [PMID: 33174350 DOI: 10.1002/cnm.3413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 10/02/2020] [Accepted: 11/01/2020] [Indexed: 06/11/2023]
Abstract
Knee connective tissues are mainly responsible for joint stability and play a crucial role in restraining excessive motion during regular activities. The damage mechanism of these tissues is directly linked to the microscale collagen level. However, this mechanical connection is still unclear. During this investigation, a multiscale fibril-reinforced hyper-elastoplastic model was developed and statistically calibrated. The model is accounting for the structural architecture of the soft tissue, starting from the tropocollagen molecule that forms fibrils to the whole soft tissue. Model predictions are in agreement with the results of experimental and numerical studies. Further, damage initiation and propagation in the collagen fiber were computed at knee ligaments and located mainly in the superficial layers. Results indicated higher crosslink density required higher tensile stress to elicit fibril damage. This approach is aligned with a realistic simulation of a damaging process and repair attempt. To the best of our knowledge, this is the first model published in which the connective tissue stiffness is simultaneously predicted by encompassing the mesoscopic scales between the molecular and macroscopic levels.
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Affiliation(s)
- Malek Adouni
- Physical Medicine and Rehabilitation Department, Northwestern University, Chicago, Illinois, USA
- Mechanical Engineering Department, Australian College of Kuwait, Kuwait city, Kuwait
| | - Raouf Mbarki
- Mechanical Engineering Department, Australian College of Kuwait, Kuwait city, Kuwait
| | - Fadi Al Khatib
- Mechanical Engineering Department, Australian College of Kuwait, Kuwait city, Kuwait
| | - Armin Eilaghi
- Mechanical Engineering Department, Australian College of Kuwait, Kuwait city, Kuwait
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Faisal TR, Adouni M, Dhaher YY. The effect of fibrillar degradation on the mechanics of articular cartilage: a computational model. Biomech Model Mechanobiol 2019; 18:733-751. [DOI: 10.1007/s10237-018-01112-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 12/20/2018] [Indexed: 12/21/2022]
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Liu C, Wang Y, Li Z, Li J, Zhang H, Fu Y, Zhang K. Tibiofemoral joint contact area and stress after single-bundle anterior cruciate ligament reconstruction with transtibial versus anteromedial portal drilling techniques. J Orthop Surg Res 2018; 13:247. [PMID: 30286774 PMCID: PMC6172839 DOI: 10.1186/s13018-018-0956-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 09/25/2018] [Indexed: 02/07/2023] Open
Abstract
Background During single-bundle ACLR, femoral tunnel location plays an important role in restoring the intact knee mechanisms, whereas malplacement of the tunnel was cited as the most common cause of knee instability. The objective of this study is to evaluate, objectively, the tibiofemoral contact area and stress after single-bundle (SB) anterior cruciate ligament reconstruction (ACLR) with femoral tunnel positions drilled by transtibial (TT) or anteromedial (AM) portal techniques. Methods Seven fresh human cadaveric knees underwent ACLR by the use of TT or AM portal techniques in a randomized order. These specimens were reused for ACL-R (TT and AM). The tibiofemoral contact area and stresses were gauged by an electronic stress-sensitive film inserted into the joint space. The knee was under the femoral axial compressive load of 1000 N using a biomechanics testing machine at 0°, 10°, 20°, and 30° of flexion. Three conditions were compared: (1) intact ACL, (2) ACLR by the use of the TT method, and (3) ACLR by the use of the AM portal method. Results Compared with AM portal ACL-reconstructed knees, a significantly decreased tibiofemoral contact area on the medial compartment was detected in the TT ACL-reconstructed knees at 20°of knee flexion (P = .047). Compared with the intact group, the TT ACLR group showed a higher mean stress at 20° and 30° of flexion on the medial compartments (P = .001, P = .003, respectively), while the AM portal ACLR group showed no significant differences at 30° of flexion (P = .073). The TT ACLR group also showed a higher mean maximum stress at 20° of flexion on the medial compartments (P = .047), while the AM portal ACLR group showed no significant differences at this angle(P = .319). Discussion The alternation of the tibiofemoral joint contact area and stress in reconstructed knees may be caused by the mismatch of the tibiofemoral joint during knee movement procedures compared with intact knees. Conclusions SB ACLR by the use of the AM portal method and TT method both alter the tibiofemoral contact area and stress when compared with the intact knee. When compared with the TT technique, ACLR by the AM portal technique more closely restores the intact tibiofemoral contact area and stress at low flexion angles.
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Affiliation(s)
- Chunhui Liu
- Department of Orthopedics, General Hospital of PLA, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Yingpeng Wang
- School of Biomedical Engineering, Capital Medical University, Beijing, 100069, China
| | - Zhongli Li
- Department of Orthopedics, General Hospital of PLA, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China.
| | - Ji Li
- Department of Orthopedics, General Hospital of PLA, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Hao Zhang
- Department of Orthopedics, General Hospital of PLA, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Yangmu Fu
- Department of Orthopedics, General Hospital of PLA, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Kuan Zhang
- School of Biomedical Engineering, Capital Medical University, Beijing, 100069, China
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Dhaher YY, Salehghaffari S, Adouni M. Anterior laxity, graft-tunnel interaction and surgical design variations during anterior cruciate ligament reconstruction: A probabilistic simulation of the surgery. J Biomech 2016; 49:3009-3016. [DOI: 10.1016/j.jbiomech.2016.07.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 07/19/2016] [Accepted: 07/20/2016] [Indexed: 01/10/2023]
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11
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Adouni M, Dhaher YY. A multi-scale elasto-plastic model of articular cartilage. J Biomech 2016; 49:2891-2898. [PMID: 27435568 DOI: 10.1016/j.jbiomech.2016.06.031] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 06/21/2016] [Accepted: 06/24/2016] [Indexed: 11/20/2022]
Abstract
Collagen damage is one of the earliest signs of cartilage degeneration and the onset of osteoarthritis (OA), but the connection between the microscale damage and macroscale tissue function is unclear. We argue that a multiscale model can help elucidate the biochemical and mechanical underpinnings of OA by connecting the microscale defects in collagen fibrils to the macroscopic cartilage mechanics. We investigated this connection using a multiscale fibril reinforced hyperelastoplastic (MFRHEP) model that accounts for the structural architecture of the soft tissue, starting from tropocollagen molecules that form fibrils, and moving to the complete soft tissue. This model was driven by reported experimental data from unconfined compression testing of cartilage. The model successfully described the observed transient response of the articular cartilage in unconfined and indentation tests with low and high loading rates. We used this model to understand damage initiation and propagation as a function of the cross-link density between tropocollagen molecules. This approach appeared to provide a realistic simulation of damage when compared with certain published studies. The current construct presents the first attempt to express the aggregate cartilage damage in terms of the cross-link density at the microfibril level.
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Affiliation(s)
- Malek Adouni
- Northwestern University, Physical Medicine and Rehabilitation Department, 345 East Superior Street, Chicago, IL 60611, USA; Rehabilitation Institute of Chicago, Sensory Motor Performance Program, 345 East Superior Street, Chicago, IL 60611, USA.
| | - Yasin Y Dhaher
- Northwestern University, Physical Medicine and Rehabilitation Department, 345 East Superior Street, Chicago, IL 60611, USA; Rehabilitation Institute of Chicago, Sensory Motor Performance Program, 345 East Superior Street, Chicago, IL 60611, USA; Northwestern University, Biomedical Engineering Department, 2145 Sheridan Road, Evanston, IL 60208, USA
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