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Song YD, Nakamura S, Kuriyama S, Nishitani K, Morita Y, Yamawaki Y, Maeda T, Sakai S, Matsuda S. Comparison of knee kinematics and ligament forces in single and multi-radius cruciate-retaining total knee arthroplasty: A computer simulation study. Knee 2023; 45:92-99. [PMID: 37925809 DOI: 10.1016/j.knee.2023.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 07/19/2023] [Accepted: 09/19/2023] [Indexed: 11/07/2023]
Abstract
BACKGROUND The single-radius design in total knee arthroplasty has been designed to develop a more fixed flexion-extension axis without mid-flexion instability compared with the multi-radius design. It remains unclear whether differences between the multi-radius and single-radius designs can affect kinematics and collateral ligament forces. This study aimed to simulate knee kinematics and kinetics between single-radius and multi-radius models using a musculoskeletal computer model. METHODS The single-radius and multi-radius femoral components were virtually implanted in a computer simulation using the same tibial insert. The effects of implant design on kinematics and medial collateral ligament forces during squatting and gait activities were analyzed. RESULTS During squatting, the multi-radius model exhibited paradoxical anterior translation on both the medial and lateral flexion facet center where peak anterior translation was 2.4 mm for medial flexion facet center and 2.2 mm for the lateral flexion facet center, while the peak anterior translation of the single-radius model was less than 1 mm at early flexion. A rapid decrease in medial collateral ligament tension was observed in the early flexion phase in the multi-radius model, which occurred simultaneously with paradoxical anterior translation, whereas the relatively constant medial collateral ligament tension was observed in the single-radius model. During gait activity, the single-radius model exhibited a more posterior position than the multi-radius model. CONCLUSION These suggest that abrupt changes in the medial collateral ligament force influence anterior sliding of the femur, and that the single-radius design is a reasonable choice for prevention of mid-flexion instability.
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Affiliation(s)
- Young Dong Song
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Shinichiro Nakamura
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
| | - Shinichi Kuriyama
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Kohei Nishitani
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Yugo Morita
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Yusuke Yamawaki
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Takahiro Maeda
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Sayako Sakai
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Shuichi Matsuda
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
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Mebarki S, Jourdan F, Canovas F, Malachanne E, Dagneaux L. Validation of a novel finite-element model for evaluating patellofemoral forces and stress during squatting after posterior-stabilized total knee arthroplasty. Orthop Traumatol Surg Res 2023; 109:103519. [PMID: 36528261 DOI: 10.1016/j.otsr.2022.103519] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 09/19/2022] [Accepted: 09/21/2022] [Indexed: 12/16/2022]
Abstract
INTRODUCTION Several studies have documented the relationship between patellofemoral pain and patient dissatisfaction after total knee arthroplasty (TKA). However, few computer simulations have been designed to evaluate the patellofemoral joint during flexion. The aim of this study was to validate a new computational simulation, driven by forces and moments, and to analyze patellofemoral reaction forces and stress under squat loading conditions after TKA implantation. HYPOTHESIS This computational simulation of a squat using a model driven by forces and moments is comparable to in vitro and in silico data from the literature. MATERIAL AND METHODS We developed a finite element model of the lower limb after implantation of a fixed-bearing posterior-stabilized TKA. To simulate squat loading conditions when standing on both legs, an initial load of 130N was applied to the center of the femoral head. Quadriceps force, patellofemoral contact force and Von Mises stress on the patellar implant, tibiofemoral contact forces and pressure on the tibial insert, and post-cam contact force were evaluated from 0° to 100° of knee flexion. RESULTS Quadriceps force increased during flexion, up to 6 times the applied load. Von Mises stress on patellar implant increased up to 16MPa at 100° flexion. Tibiofemoral contact forces increased up to 415 N medially and 339 N laterally, with 64% distributed medially on the tibial insert. Post-cam contact started slightly before 70° of flexion. DISCUSSION In this simulation, tibiofemoral, patellofemoral and post-cam contact forces, and pressure distribution on the tibial insert were consistent with various published studies. This agreement suggests that computational simulation driven by forces and moments can reproduce squat loading conditions during knee flexion after TKA, without experimental kinematic data used to drive the simulation. CONCLUSION This study represents an initial step towards validating tibiofemoral and patellofemoral mechanical behavior under squat conditions, from this computational simulation driven by forces and moments. This model will help us better understand the influence of various implantation techniques on patellofemoral forces and stress during flexion. LEVEL OF EVIDENCE IV, biomechanical computational study.
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Affiliation(s)
- Salah Mebarki
- Laboratoire de mécanique et génie civil (LMGC), CNRS, Montpellier University of Excellence (MUSE), 860, rue de St-Priest, 34090 Montpellier, France
| | - Franck Jourdan
- Laboratoire de mécanique et génie civil (LMGC), CNRS, Montpellier University of Excellence (MUSE), 860, rue de St-Priest, 34090 Montpellier, France
| | - François Canovas
- Department of Orthopaedic Surgery, Lower limb Surgery Unit, Lapeyronie University Hospital, Montpellier University, 371, avenue Gaston-Giraud, 34295 Montpellier, France
| | - Etienne Malachanne
- Laboratoire de mécanique et génie civil (LMGC), CNRS, Montpellier University of Excellence (MUSE), 860, rue de St-Priest, 34090 Montpellier, France
| | - Louis Dagneaux
- Laboratoire de mécanique et génie civil (LMGC), CNRS, Montpellier University of Excellence (MUSE), 860, rue de St-Priest, 34090 Montpellier, France; Department of Orthopaedic Surgery, Lower limb Surgery Unit, Lapeyronie University Hospital, Montpellier University, 371, avenue Gaston-Giraud, 34295 Montpellier, France.
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How does asymmetric tibial insert affect tibiofemoral kinematics and contact stresses in total knee Arthroplasty? Knee 2022; 39:185-196. [PMID: 36209651 DOI: 10.1016/j.knee.2022.09.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 07/30/2022] [Accepted: 09/18/2022] [Indexed: 12/12/2022]
Abstract
BACKGROUND Asymmetric tibial insert design is expected to restore normal knee kinematics better than symmetric design. A tri-condylar implant has asymmetric and symmetric tibial inserts with a ball-and-socket joint to replace the post-cam mechanism. The purpose of this study was to compare the knee kinematics of the two designs and to measure tibiofemoral contact stresses, including that of the ball-and-socket joint. METHODS Using a computer simulation, the anteroposterior position and axial rotation of the femoral component were simulated during a weight-bearing deep knee bend for six validated models. Contact forces were simultaneously simulated in the medial, lateral, and ball-and-socket compartments. The relative position and the magnitude and direction of each contact force were applied to aforce/displacement control knee simulator. The contact stresses were measured individually using a pressure sensor. RESULTS The asymmetric tibial insert demonstrated a more posterior position of the femoral component in the lateral compartment during the entire range of motion and greater external rotation of the femoral component, compared to the symmetrical tibial insert. The mean peak contact stress of the medial and lateral compartments was < 9 Mpa, with no significant differences between the two designs except at 0°. The contact stress of the ball-and-socket joint was < 5 MPa. CONCLUSIONS Asymmetry of the tibial insert shows significant kinematic difference and has little influence on the peak contact stress, which is considerably lower than the yield strength of polyethylene. The asymmetric tibial insert can lead to clinical benefits owing to its kinematic and kinetic properties.
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陈 瑱, 张 志, 高 永, 张 静, 郭 磊, 靳 忠. [Musculoskeletal multibody dynamics investigation of posterior-stabilized total knee prosthesis]. SHENG WU YI XUE GONG CHENG XUE ZA ZHI = JOURNAL OF BIOMEDICAL ENGINEERING = SHENGWU YIXUE GONGCHENGXUE ZAZHI 2022; 39:651-659. [PMID: 36008328 PMCID: PMC10957355 DOI: 10.7507/1001-5515.202203023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/24/2022] [Indexed: 06/15/2023]
Abstract
Posterior-stabilized total knee prostheses have been widely used in orthopedic clinical treatment of knee osteoarthritis, but the patients and surgeons are still troubled by the complications, for example severe wear and fracture of the post, as well as prosthetic loosening. Understanding the in vivo biomechanics of knee prostheses will aid in the decrease of postoperative prosthetic revision and patient dissatisfaction. Therefore, six different designs of posterior-stabilized total knee prostheses were used to establish the musculoskeletal multibody dynamics models of total knee arthroplasty respectively, and the biomechanical differences of six posterior-stabilized total knee prostheses were investigated under three simulated physiological activities: walking, right turn and squatting. The results showed that the post contact forces of PFC Sigma and Scorpio NGR prostheses were larger during walking, turning right, and squatting, which may increase the risk of the fracture and wear as well as the early loosening. The post design of Gemini SL prosthesis was more conductive to the knee internal-external rotation and avoided the edge contact and wear. The lower conformity design in sagittal plane and the later post-cam engagement resulted in the larger anterior-posterior translation. This study provides a theoretical support for guiding surgeon selection, improving posterior-stabilized prosthetic design and reducing the prosthetic failure.
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Affiliation(s)
- 瑱贤 陈
- 长安大学 工程机械学院(西安 710064)School of Construction Machinery, Chang'an University, Xi’an 710064, P. R. China
| | - 志峰 张
- 长安大学 工程机械学院(西安 710064)School of Construction Machinery, Chang'an University, Xi’an 710064, P. R. China
| | - 永昌 高
- 长安大学 工程机械学院(西安 710064)School of Construction Machinery, Chang'an University, Xi’an 710064, P. R. China
| | - 静 张
- 长安大学 工程机械学院(西安 710064)School of Construction Machinery, Chang'an University, Xi’an 710064, P. R. China
| | - 磊 郭
- 长安大学 工程机械学院(西安 710064)School of Construction Machinery, Chang'an University, Xi’an 710064, P. R. China
| | - 忠民 靳
- 长安大学 工程机械学院(西安 710064)School of Construction Machinery, Chang'an University, Xi’an 710064, P. R. China
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5
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Mizu-Uchi H, Ma Y, Ishibashi S, Colwell CW, Nakashima Y, D'Lima DD. Tibial sagittal and rotational alignment reduce patellofemoral stresses in posterior stabilized total knee arthroplasty. Sci Rep 2022; 12:12319. [PMID: 35854017 PMCID: PMC9296446 DOI: 10.1038/s41598-022-15759-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Accepted: 06/29/2022] [Indexed: 11/09/2022] Open
Abstract
Patellofemoral joint complications remain an important issue in total knee arthroplasty. We compared the patellofemoral contact status between cruciate-retaining and posterior-stabilized designs with varying degrees of tibial sagittal and rotational alignment using a computer simulation to ensure proper alignments in total knee arthroplasty. Knee kinematics, patellofemoral contact force and quadriceps force were computed using a musculoskeletal modeling program (LifeMOD/KneeSIM 2010; LifeModeler, Inc., San Clemente, California) during a weight-bearing deep knee bend. Two different posterior tibial slope (PTS)s (3° and 7°) and five different tibial tray rotational alignments (neutral, internal 5° and 10°, and external 5° and 10°) were simulated. Patellofemoral contact area and stresses were next computed using finite element analysis. The patellofemoral contact force for the posterior-stabilized design was substantially lower than the cruciate-retaining design after post-cam contact because of increasing femoral roll-back. Neutral rotational alignment of the tibial component resulted in smaller differences in patellofemoral contact stresses between cruciate-retaining and posterior-stabilized designs for PTSs of 3° or 7°. However, the patellar contact stresses in the cruciate-retaining design were greater than those in posterior-stabilized design at 120° of knee flexion with PTS of 3° combined with internal rotation of the tibial component. Our study provides biomechanical evidence implicating lower PTSs combined with internal malrotation of the tibial component and the resultant increase in patellofemoral stresses as a potential source of anterior knee pain in cruciate-retaining design.
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Affiliation(s)
- Hideki Mizu-Uchi
- Department of Orthopaedic Surgery, Saiseikai Fukuoka General Hospital, 1-3-46, Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan.,Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Yuan Ma
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Shojiro Ishibashi
- Department of Orthopaedic Surgery, Saiseikai Fukuoka General Hospital, 1-3-46, Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan.,Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Clifford W Colwell
- Shiley Center for Orthopaedic Research and Education at Scripps Clinic, 10666 North Torrey Pines Road, MS126, La Jolla, CA, 92037, USA
| | - Yasuharu Nakashima
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Darryl D D'Lima
- Shiley Center for Orthopaedic Research and Education at Scripps Clinic, 10666 North Torrey Pines Road, MS126, La Jolla, CA, 92037, USA.
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Schroeder S, Jaeger S, Schwer J, Seitz AM, Hamann I, Werner M, Thorwaechter C, Santos I, Wendler T, Nebel D, Welke B. Accuracy measurement of different marker based motion analysis systems for biomechanical applications: A round robin study. PLoS One 2022; 17:e0271349. [PMID: 35816503 PMCID: PMC9273086 DOI: 10.1371/journal.pone.0271349] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 06/28/2022] [Indexed: 11/18/2022] Open
Abstract
Introduction Multiple camera systems are widely used for 3D-motion analysis. Due to increasing accuracies these camera systems gained interest in biomechanical research areas, where high precision measurements are desirable. In the current study different measurement systems were compared regarding their measurement accuracy. Materials and methods Translational and rotational accuracy measurements as well as the zero offset measurements of seven different measurement systems were performed using two reference devices and two different evaluation algorithms. All measurements were performed in the same room with constant temperature at the same laboratory. Equal positions were measured with the systems according to a standardized protocol. Measurement errors were determined and compared. Results The highest measurement errors were seen for a measurement system using active ultrasonic markers, followed by another active marker measurement system (infrared) having measurement errors up to several hundred micrometers. The highest accuracies were achieved by three stereo camera systems, using passive 2D marker points having errors typically below 20 μm. Conclusions This study can help to better assess the results obtained with different measurement systems. With the focus on the measurement accuracy, only one aspect in the selection of a system was considered. Depending on the requirements of the user, other factors like measurement frequency, the maximum analyzable volume, the marker type or the costs are important factors as well.
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Affiliation(s)
- Stefan Schroeder
- Laboratory of Biomechanics and Implant Research, Department of Orthopaedics, Heidelberg University Hospital, Heidelberg, Germany
| | - Sebastian Jaeger
- Laboratory of Biomechanics and Implant Research, Department of Orthopaedics, Heidelberg University Hospital, Heidelberg, Germany
| | - Jonas Schwer
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Ulm, Germany
| | - Andreas Martin Seitz
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Ulm, Germany
| | - Isabell Hamann
- Fraunhofer Institute for Machine Tools and Forming Technology, Dresden, Germany
| | - Michael Werner
- Fraunhofer Institute for Machine Tools and Forming Technology, Dresden, Germany
| | - Christoph Thorwaechter
- Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Germany
| | - Inês Santos
- Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Germany
| | - Toni Wendler
- ZESBO—Center for Research on Musculoskeletal Systems, Leipzig University, Leipzig, Germany
| | - Dennis Nebel
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany
| | - Bastian Welke
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany
- * E-mail:
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Hosseini Nasab SH, Smith CR, Maas A, Vollenweider A, Dymke J, Schütz P, Damm P, Trepczynski A, Taylor WR. Uncertainty in Muscle–Tendon Parameters can Greatly Influence the Accuracy of Knee Contact Force Estimates of Musculoskeletal Models. Front Bioeng Biotechnol 2022; 10:808027. [PMID: 35721846 PMCID: PMC9204520 DOI: 10.3389/fbioe.2022.808027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 05/03/2022] [Indexed: 01/07/2023] Open
Abstract
Understanding the sources of error is critical before models of the musculoskeletal system can be usefully translated. Using in vivo measured tibiofemoral forces, the impact of uncertainty in muscle–tendon parameters on the accuracy of knee contact force estimates of a generic musculoskeletal model was investigated following a probabilistic approach. Population variability was introduced to the routine musculoskeletal modeling framework by perturbing input parameters of the lower limb muscles around their baseline values. Using ground reaction force and skin marker trajectory data collected from six subjects performing body-weight squat, the knee contact force was calculated for the perturbed models. The combined impact of input uncertainties resulted in a considerable variation in the knee contact force estimates (up to 2.1 BW change in the predicted force), especially at larger knee flexion angles, hence explaining up to 70% of the simulation error. Although individual muscle groups exhibited different contributions to the overall error, variation in the maximum isometric force and pathway of the muscles showed the highest impacts on the model outcomes. Importantly, this study highlights parameters that should be personalized in order to achieve the best possible predictions when using generic musculoskeletal models for activities involving deep knee flexion.
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Affiliation(s)
- Seyyed Hamed Hosseini Nasab
- Laboratory for Movement Biomechanics, ETH Zürich, Zürich, Switzerland
- *Correspondence: Seyyed Hamed Hosseini Nasab, ; William R. Taylor,
| | - Colin R. Smith
- Laboratory for Movement Biomechanics, ETH Zürich, Zürich, Switzerland
| | - Allan Maas
- Aesculap AG, Tuttlingen, Germany
- Department of Orthopaedic and Trauma Surgery, Ludwig Maximilians University Munich, Musculoskeletal University Center Munich (MUM), Campus Grosshadern, Munich, Germany
| | | | - Jörn Dymke
- Julius Wolff Institute, Berlin Institute of Health at Charité—Universitätsmedizin Berlin, Berlin, Germany
| | - Pascal Schütz
- Laboratory for Movement Biomechanics, ETH Zürich, Zürich, Switzerland
| | - Philipp Damm
- Julius Wolff Institute, Berlin Institute of Health at Charité—Universitätsmedizin Berlin, Berlin, Germany
| | - Adam Trepczynski
- Julius Wolff Institute, Berlin Institute of Health at Charité—Universitätsmedizin Berlin, Berlin, Germany
| | - William R. Taylor
- Laboratory for Movement Biomechanics, ETH Zürich, Zürich, Switzerland
- *Correspondence: Seyyed Hamed Hosseini Nasab, ; William R. Taylor,
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8
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Kothurkar R, Lekurwale R. Techniques to determine knee joint contact forces during squatting: A systematic review. Proc Inst Mech Eng H 2022; 236:775-784. [DOI: 10.1177/09544119221091609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This review article provides an overview of techniques used to determine human knee joint contact forces during squatting. The main two approaches are experimental and theoretical. Thigh calf contact has a significant effect on knee forces and should not be neglected. In this study, data were searched electronically and organized by techniques to find knee joint contact force during squatting theoretically and experimentally. There was a large variation in peak tibiofemoral (CV = 0.45) and patellofemoral (CV = 0.38) contact forces predicted theoretically. However, very little variation was observed between peak tibiofemoral contact forces (CV = 0.12) measured in vivo experimentally but measured knee joint force is available up to a limited knee flexion angle. There was a reduction in knee joint contact forces due to thigh calf contact. Literature of knee joint contact force prediction theoretically during squatting incorporating thigh calf contact force is very limited.
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Affiliation(s)
- Rohan Kothurkar
- Department of Mechanical Engineering, K. J. Somaiya College of Engineering, Ghatkopar, Mumbai, India
| | - Ramesh Lekurwale
- Department of Mechanical Engineering, K. J. Somaiya College of Engineering, Ghatkopar, Mumbai, India
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9
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Kinematics and kinetics comparison of ultra-congruent versus medial-pivot designs for total knee arthroplasty by multibody analysis. Sci Rep 2022; 12:3052. [PMID: 35197496 PMCID: PMC8866513 DOI: 10.1038/s41598-022-06909-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 02/08/2022] [Indexed: 12/18/2022] Open
Abstract
Nowadays, several configurations of total knee arthroplasty (TKA) implants are commercially available whose designs resulted from clinical and biomechanical considerations. Previous research activities led to the development of the so-called medial-pivot (MP) design. However, the actual benefits of the MP, with respect to other prosthesis designs, are still not well understood. The present work compares the impact of two insert geometries, namely the ultra-congruent (UC) and medial-pivot (MP), on the biomechanical behaviour of a bicondylar total knee endoprosthesis. For this purpose, a multibody model of a lower limb was created alternatively integrating the two implants having the insert geometry discretized. Joint dynamics and contact pressure distributions were evaluated by simulating a squat motion. Results showed a similar tibial internal rotation range of about 3.5°, but an early rotation occurs for the MP design. Furthermore, the discretization of the insert geometry allowed to efficiently derive the contact pressure distributions, directly within the multibody simulation framework, reporting peak pressure values of 33 MPa and 20 MPa for the UC and MP, respectively. Clinically, the presented findings confirm the possibility, through a MP design, to achieve a more natural joint kinematics, consequently improving the post-operative patient satisfaction and potentially reducing the occurrence of phenomena leading to the insert loosening.
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10
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Song YD, Nakamura S, Kuriyama S, Nishitani K, Ito H, Morita Y, Yamawaki Y, Matsuda S. Biomechanical Comparison of Kinematic and Mechanical Knee Alignment Techniques in a Computer Simulation Medial Pivot Total Knee Arthroplasty Model. J Knee Surg 2021; 36:596-604. [PMID: 34891188 DOI: 10.1055/s-0041-1740392] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Several concepts may be used to restore normal knee kinematics after total knee arthroplasty. One is a kinematically aligned (KA) technique, which restores the native joint line and limb alignment, and the other is the use of a medial pivot knee (MPK) design, with a ball and socket joint in the medial compartment. This study aimed to compare motions, contact forces, and contact stress between mechanically aligned (MA) and KA (medial tilt 3° [KA3] and 5° [KA5]) models in MPK. An MPK design was virtually implanted with MA, KA3, and KA5 in a validated musculoskeletal computer model of a healthy knee, and the simulation of motion and contact forces was implemented. Anteroposterior (AP) positions, mediolateral positions, external rotation angles of the femoral component relative to the tibial insert, and tibiofemoral contact forces were evaluated at different knee flexion angles. Contact stresses on the tibial insert were calculated using finite element analysis. The AP position at the medial compartment was consistent for all models. From 0° to 120°, the femoral component in KA models showed larger posterior movement at the lateral compartment (0.3, 6.8, and 17.7 mm in MA, KA3, and KA5 models, respectively) and larger external rotation (4.2°, 12.0°, and 16.8° in the MA, KA3, and KA5 models, respectively) relative to the tibial component. Concerning the mediolateral position of the femoral component, the KA5 model was positioned more medially. The contact forces at the lateral compartment of all models were larger than those at the medial compartment at >60° of knee flexion. The peak contact stresses on the tibiofemoral joint at 90° and 120° of knee flexion were higher in the KA models. However, the peak contact stresses of the KA models at every flexion angle were <20 MPa. The KA technique in MPK can successfully achieve near-normal knee kinematics; however, there may be a concern for higher contact stresses on the tibial insert.
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Affiliation(s)
- Young Dong Song
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shinichiro Nakamura
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shinichi Kuriyama
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kohei Nishitani
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hiromu Ito
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Department of Advanced Medicine for Rheumatic Diseases, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yugo Morita
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yusuke Yamawaki
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shuichi Matsuda
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Twiggs J, Miles B, Roe J, Fritsch B, Liu D, Parker D, Dickison D, Shimmin A, BarBo J, McMahon S, Solomon M, Boyle R, Walter L. Can TKA outcomes be predicted with computational simulation? Generation of a patient specific planning tool. Knee 2021; 33:38-48. [PMID: 34543991 DOI: 10.1016/j.knee.2021.08.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 06/21/2021] [Accepted: 08/25/2021] [Indexed: 02/02/2023]
Abstract
BACKGROUND Computer simulations of knee movement allow Total Knee Arthroplasty (TKA) dynamic outcomes to be studied. This study aims to build a model predicting patient reported outcome from a simulation of post-operative TKA joint dynamics. METHODS Landmark localisation was performed on 239 segmented pre-operative computerized tomography (CT) scans to capture patient specific soft tissue attachments. The pre-operative bones and 3D implant files were registered to post-operative CT scans following TKA. Each post-operative knee was simulated undergoing a deep knee bend with assumed ligament balancing of the extension space. The kinematic results from this simulation were used in a Multivariate Adaptive Regression Spline algorithm, predicting attainment of a Patient Acceptable Symptom State (PASS) score in captured 12 month post-operative Knee Injury and Osteoarthritis Outcome Scores (KOOS). An independent series of 250 patients was evaluated by the predictive model to assess how the predictive model behaved in a pre-operative planning context. RESULTS The generated predictive algorithm, called the Dynamic Knee Score (DKS) contained features, in order of significance, related to tibio-femoral force, patello-femoral motion and tibio-femoral motion. Area Under the Curve for predicting attainment of the PASS KOOS Score was 0.64. The predictive model produced a bimodal spread of predictions, reflecting a tendency to either strongly prefer one alignment plan over another or be ambivalent. CONCLUSION A predictive algorithm relating patient reported outcome to the outputs of a computational simulation of a deep knee bend has been derived (the DKS). Simulation outcomes related to tibio-femoral balance had the highest correlation with patient reported outcome.
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Affiliation(s)
| | | | - Justin Roe
- North Sydney Orthopaedic and Sports Medicine Centre, The Mater Hospital, North Sydney 2060, Australia
| | - Brett Fritsch
- Sydney Orthopaedic Research Institute, Sydney 2067, Australia
| | - David Liu
- Gold Coast Centre for Bone and Joint Surgery, Gold Coast 4221, Australia
| | - David Parker
- Sydney Orthopaedic Research Institute, Sydney 2067, Australia
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Teng Y, Mizu-Uchi H, Xia Y, Akasaki Y, Akiyama T, Kawahara S, Nakashima Y. Axial But Not Sagittal Hinge Axis Affects Posterior Tibial Slope in Medial Open-Wedge High Tibial Osteotomy: A 3-Dimensional Surgical Simulation Study. Arthroscopy 2021; 37:2191-2201. [PMID: 33581296 DOI: 10.1016/j.arthro.2021.01.063] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 01/25/2021] [Accepted: 01/25/2021] [Indexed: 02/02/2023]
Abstract
PURPOSE The purpose of this 3-dimensional (3D) surgical simulation study was to investigate the effects of axial and sagittal hinge axes (hinge axes in the axial and sagittal planes) on medial and lateral posterior tibial slope (PTS) in medial open-wedge high tibial osteotomy (OWHTO), and evaluate the quantitative relationship between hinge axis and PTS change. METHODS Preoperative computed tomography data from patients with varus knee deformity were collected. A standard hinge axis (0°) and 12 different hinge axes (6 axial hinge axes and 6 sagittal hinge axes: ±10°, ±20°, and ±30°) were defined in a 3D surgical simulation of OWHTO using a bone model. The differences between before and after simulation surgery in medial and lateral PTS, medial proximal tibial angle, opening gap, and opening wedge angle were measured. RESULTS In total, 93 varus knees in 93 patients were included for study. Compared with the standard hinge axis, axial hinge axis significantly affected medial and lateral PTS (P < .001). In contrast, sagittal hinge axis had no significant effect on medial and lateral PTS (P > .05). Every 10° change in axial hinge axis with a mean coronal valgus correction of 10° might result in approximately 1.6° of alteration in PTS. Stepwise regression analysis showed that axial hinge axis is the most significant factors affecting PTS (β coefficient = 0.78, P < .001), followed by opening wedge angle (β coefficient = 0.36, P < .001) and gap ratio (β coefficient = 0.12, P < 0.001). CONCLUSION Based on our findings of 3D OWHTO simulation, axial hinge axis significantly influences medial and lateral PTS in OWHTO, but sagittal hinge axis has no effect on change in PTS. Every 10° change of axial hinge axis with a 10° coronal valgus correction caused approximately 1.6° change of PTS. CLINICAL RELEVANCE Hinge axis in the axial plane significantly affects PTS, but hinge axis in the sagittal plane has no effect on PTS. To maintain PTS, surgeons should make hinge axis at the true lateral position of the tibia in the axial plane. To intentionally alter PTS, an anterolateral axial hinge axis could be used to decrease PTS or a posterolateral axial hinge axis could be used to increase PTS. Opening wedge angle or gap ratio is also useful for intentional modification of PTS.
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Affiliation(s)
- Yuanjun Teng
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou University, Lanzhou, Gansu, China; Department of Orthopaedic Surgery, Kyushu University, Kasuya-gun, Fukuoka, Japan
| | - Hideki Mizu-Uchi
- Department of Orthopaedic Surgery, Kyushu University, Kasuya-gun, Fukuoka, Japan.
| | - Yayi Xia
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou University, Lanzhou, Gansu, China.
| | - Yukio Akasaki
- Department of Orthopaedic Surgery, Kyushu University, Kasuya-gun, Fukuoka, Japan
| | - Takenori Akiyama
- Akiyama Clinic, Midorigahama, Shingumachi, Kasuya-gun, Fukuoka, Japan
| | - Shinya Kawahara
- Department of Orthopaedic Surgery, Kyushu University, Kasuya-gun, Fukuoka, Japan
| | - Yasuharu Nakashima
- Department of Orthopaedic Surgery, Kyushu University, Kasuya-gun, Fukuoka, Japan
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Kaneko T, Kono N, Mochizuki Y, Hada M, Toyoda S, Ikegami H, Musha Y. The influence of tibiofemoral joint forces on patient-reported outcome measurements after bicruciate stabilized total knee arthroplasty. J Orthop Surg (Hong Kong) 2021; 28:2309499020915106. [PMID: 32308123 DOI: 10.1177/2309499020915106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE Insall advocated that a successful clinical outcome of total knee arthroplasty (TKA) depends on soft tissue balance procedure. Spacer blocks, balancer, and instrumented tibial sensor (VERESENSE, OrthoSensor, Dania, Florida, USA) are the current methods of soft tissue balancing during TKA. The purpose of the study is to assess intraoperative medial and lateral tibiofemoral compressive force (TFCF) using novel insert sensor and investigate the relationship between TFCF and patient-reported outcome measurements (PROMs). METHODS Twenty-five patients who underwent bicruciate stabilized (BCS) TKA were evaluated retrospectively. We measured intraoperative medial and lateral TFCF in neutral position as well as the force ratio (FR %:medial TFCF/medial + lateral TFCF) in varus and valgus position using the novel insert sensor throughout the range of motion (ROM) and assessed the relationship between intraoperative medial and lateral TFCF and PROM at 6 months after TKA. RESULTS Medial TFCF increased and lateral TFCF decreased throughout ROM. The mean FR was 0.44% ± 0.22 throughout ROM. Medial and lateral TFCF differences at 60° of ROM in neutral position showed a positive correlation with physical function in Western Ontario and McMaster Universities scores (r = 0.60, p < 0.05). Medial and lateral TFCF differences at 30° and 140° of ROM in valgus stress test showed a positive correlation with symptoms in 2011 Knee Society Scores (r = 0.49, p < 0.05; r = 0.51, p < 0.05). CONCLUSION The present study revealed that BCS TKA reproduces the coronal laxity, which is similar to healthy knee. These results suggest that intraoperative medial stability is important for function and symptoms, therefore, surgeons should not release medial soft tissue for achieving better clinical outcomes after BCS TKA. LEVEL OF EVIDENCE II.
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Affiliation(s)
- Takao Kaneko
- Department of Orthopedic Surgery, Toho University School of Medicine, Ota City, Tokyo, Japan
| | - Norihiko Kono
- Department of Orthopedic Surgery, Toho University School of Medicine, Ota City, Tokyo, Japan
| | - Yuta Mochizuki
- Department of Orthopedic Surgery, Toho University School of Medicine, Ota City, Tokyo, Japan
| | - Masaru Hada
- Department of Orthopedic Surgery, Toho University School of Medicine, Ota City, Tokyo, Japan
| | - Shinya Toyoda
- Department of Orthopedic Surgery, Toho University School of Medicine, Ota City, Tokyo, Japan
| | - Hiroyasu Ikegami
- Department of Orthopedic Surgery, Toho University School of Medicine, Ota City, Tokyo, Japan
| | - Yoshiro Musha
- Department of Orthopedic Surgery, Toho University School of Medicine, Ota City, Tokyo, Japan
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14
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McGibbon CA, Brandon S, Bishop EL, Cowper-Smith C, Biden EN. Biomechanical Study of a Tricompartmental Unloader Brace for Patellofemoral or Multicompartment Knee Osteoarthritis. Front Bioeng Biotechnol 2021; 8:604860. [PMID: 33585409 PMCID: PMC7876241 DOI: 10.3389/fbioe.2020.604860] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 12/15/2020] [Indexed: 11/13/2022] Open
Abstract
Objective: Off-loader knee braces have traditionally focused on redistributing loads away from either the medial or lateral tibiofemoral (TF) compartments. In this article, we study the potential of a novel "tricompartment unloader" (TCU) knee brace intended to simultaneously unload both the patellofemoral (PF) and TF joints during knee flexion. Three different models of the TCU brace are evaluated for their potential to unload the knee joint. Methods: A sagittal plane model of the knee was used to compute PF and TF contact forces, patellar and quadriceps tendon forces, and forces in the anterior and posterior cruciate ligaments during a deep knee bend (DKB) test using motion analysis data from eight participants. Forces were computed for the observed (no brace) and simulated braced conditions. A sensitivity and validity analysis was conducted to determine the valid output range for the model, and Statistical Parameter Mapping was used to quantify the effectual region of the different TCU brace models. Results: PF and TF joint force calculations were valid between ~0 and 100 degrees of flexion. All three simulated brace models significantly (p < 0.001) reduced predicted knee joint loads (by 30-50%) across all structures, at knee flexion angles >~30 degrees during DKB. Conclusions: The TCU brace is predicted to reduce PF and TF knee joint contact loads during weight-bearing activity requiring knee flexion angles between 30 and 100 degrees; this effect may be clinically beneficial for pain reduction or rehabilitation from common knee injuries or joint disorders. Future work is needed to assess the range of possible clinical and prophylactic benefits of the TCU brace.
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Affiliation(s)
- Chris A McGibbon
- Faculty of Kinesiology and Institute of Biomedical Engineering, University of New Brunswick, Fredericton, NB, Canada
| | - Scott Brandon
- School of Engineering, University of Guelph, Guelph, ON, Canada
| | - Emily L Bishop
- Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, AB, Canada
| | | | - Edmund N Biden
- Department of Mechanical Engineering and Institute of Biomedical Engineering, University of New Brunswick, Fredericton, NB, Canada
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Nishitani K, Hatada R, Kuriyama S, Lyman SL, Nakamura S, Ito H, Matsuda S. A greater reduction in the distal femoral anterior condyle improves flexion after total knee arthroplasty in patients with osteoarthritis. Knee 2019; 26:1364-1371. [PMID: 31653442 DOI: 10.1016/j.knee.2019.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 09/02/2019] [Indexed: 02/02/2023]
Abstract
BACKGROUND The effect of an anterior condylar height (ACH) change after total knee arthroplasty (TKA) is not well-known. The effect of an ACH change was evaluated on postoperative knee flexion, New Knee Society Scores (2011KSS), and patellofemoral contact force. METHODS The study included 101 knees that underwent TKA. The medial or lateral ACH was measured using pre-operative and postoperative computed tomography. Pearson correlation between the change in ACH and knee flexion was calculated. The determinant of the change in flexion was evaluated using multivariable linear regression. The association between ACH and 2011KSS was assessed. Using the cases with the three highest and three lowest pre-operative medial ACHs, computer simulation was performed to detect the changes in patellofemoral contact forces. RESULTS A postoperative reduction in ACH correlated with increased flexion at one year (medial ACH, R = 0.58; lateral ACH, R = 0.48). On multivariable linear regression, reductions in medial ACH (β = 1.7, P < 0.001) and pre-operative flexion (β = -0.3, P < 0.001) were associated with increased flexion. A decrease in ACH was associated with improvements in advanced activities (medial, R2 = 0.06; lateral, R2 = 0.08) in 2011KSS. On computer simulation, all three cases with reduced and increased medial ACHs showed decreased and increased patellofemoral contact forces, respectively. CONCLUSIONS A change in ACH was an independent predictor of knee flexion after TKA. Greater reduction in ACH was associated with improved flexion after TKA, whereas an increase in postoperative ACH may be a risk factor for flexion loss.
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Affiliation(s)
- Kohei Nishitani
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Ryosuke Hatada
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shinichi Kuriyama
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Stephen L Lyman
- Healthcare Research Institute, Hospital for Special Surgery, New York, NY, USA
| | - Shinichiro Nakamura
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hiromu Ito
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shuicih Matsuda
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Flores-Hernandez C, Eskinazi I, Hoenecke HR, D'Lima DD. Scapulothoracic rhythm affects glenohumeral joint force. JSES OPEN ACCESS 2019; 3:77-82. [PMID: 31334433 PMCID: PMC6620199 DOI: 10.1016/j.jses.2019.03.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hypothesis Musculoskeletal computer models provide valuable insights into shoulder biomechanics. The shoulder is a complex joint composed of glenohumeral, scapulothoracic, acromioclavicular, and sternoclavicular articulations, whose function is largely dependent on the many muscles spanning these joints. However, the range of patient-to-patient variability in shoulder function is largely unknown. We therefore assessed the sensitivity of glenohumeral forces to population-based model input parameters that were likely to influence shoulder function. Methods We constructed musculoskeletal models of the shoulder in the AnyBody Modeling System (AnyBody Technology, Aalborg, Denmark). We used inverse dynamics and static optimization to solve for glenohumeral joint forces during a simulated shoulder elevation. We generated 1000 AnyBody models by uniformly distributing the following input parameters: subject height, scapulohumeral rhythm, humeral head radius, and acromiohumeral interval. Results Increasing body height increased glenohumeral joint forces. Increasing the ratio of scapulothoracic to glenohumeral elevation also increased forces. Increasing humeral head radius and acromiohumeral interval decreased forces. The relative sensitivity of glenohumeral joint forces to input parameters was dependent on the angle of shoulder elevation. We developed an efficient method of generating and simulating musculoskeletal models representing a large population of shoulder arthroplasty patients. We found that scapulohumeral rhythm had a significant influence on glenohumeral joint force. Conclusions This finding underscores the importance of more accurately measuring and simulating scapulothoracic motion rather than using fixed ratios or average scapulothoracic motion. This modeling approach can be used to generate virtual populations for conducting efficient simulations and generating statistical conclusions.
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Affiliation(s)
| | - Ilan Eskinazi
- Shiley Center for Orthopaedic Research & Education at Scripps Clinic, La Jolla, CA, USA
| | - Heinz R Hoenecke
- Shiley Center for Orthopaedic Research & Education at Scripps Clinic, La Jolla, CA, USA
| | - Darryl D D'Lima
- Shiley Center for Orthopaedic Research & Education at Scripps Clinic, La Jolla, CA, USA
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17
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Patellar bone strain after total knee arthroplasty is correlated with bone mineral density and body mass index. Med Eng Phys 2019; 68:17-24. [PMID: 30979584 DOI: 10.1016/j.medengphy.2019.03.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 03/15/2019] [Accepted: 03/31/2019] [Indexed: 11/20/2022]
Abstract
Patella-related complications after total knee arthroplasty (TKA) remain a major clinical concern. Previous studies have suggested that increased postoperative patellar bone strain could be related to such complications, but there is limited knowledge on patellar strain after TKA. The objective of this study was to predict patellar bone strain after TKA and evaluate correlations with various preoperative data. Fourteen TKA patients with a minimum follow-up of one year were included in this study. Using preoperative CT datasets, preoperative planning, and postoperative X-rays, a method is presented to generate patient-specific finite element models after virtual TKA. Patellar kinematics and forces were predicted during a squat movement, and patellar bone strain was evaluated at 60° of knee flexion. Strain varied greatly among patients, but was strongly negatively correlated (r = -0.85, p < 0.001) with bone mineral density (BMD) and moderately positively (r = 0.54, p = 0.05) with body mass index (BMI). The BMI/BMD ratio explained 87% of strain, and should be further investigated as a potential risk factor for clinical complications. This study represents a preliminary step towards the identification of patients at risk of patellar complications after TKA.
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18
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Watanabe M, Kuriyama S, Nakamura S, Nishitani K, Tanaka Y, Sekiguchi K, Ito H, Matsuda S. Impact of intraoperative adjustment method for increased flexion gap on knee kinematics after posterior cruciate ligament-sacrificing total knee arthroplasty. Clin Biomech (Bristol, Avon) 2019; 63:85-94. [PMID: 30851566 DOI: 10.1016/j.clinbiomech.2019.02.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Revised: 02/26/2019] [Accepted: 02/26/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND In general, the flexion gap is larger than the extension gap with posterior cruciate ligament-sacrificing total knee arthroplasty. Several methods compensate for an excessive flexion gap, but their effects are unknown. The purpose of this study was to compare three methods to compensate for an increased flexion gap. METHODS In this study, squatting in knees with excessive (4 mm) and moderate (2 mm) flexion gaps was simulated in a computer model. Differences in knee kinematics and kinetics with joint line elevation, setting the femoral component in flexion, and using a larger femoral component as compensatory methods were investigated. FINDINGS The rotational kinematics during flexion with setting the femoral component in flexion were opposite to those in the other models. Using a larger femoral component resulted in the most physiological motion. The peak anterior translation was 10 mm in the joint line elevation model compared with approximately 6 mm in the other models. In the joint line elevation model, patellofemoral contact stress was excessively increased at 90° of knee flexion. In contrast, tibiofemoral contact stress was higher during knee extension with setting the femoral component in flexion due to anterior impingement. There were few differences in the effect of the three compensatory methods with a moderate flexion gap. INTERPRETATION A larger femoral component should be used to compensate for an excessive flexion gap because it has less negative impact on posterior cruciate ligament-sacrificing total knee arthroplasty, whereas any compensation method might be acceptable for a moderate flexion gap.
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Affiliation(s)
- Mutsumi Watanabe
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
| | - Shinichi Kuriyama
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
| | - Shinichiro Nakamura
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
| | - Kohei Nishitani
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
| | - Yoshihisa Tanaka
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
| | - Kazuya Sekiguchi
- Department of Orthopaedic Surgery, Yawata Central Hospital, 39-1 Gotanda, Yawata-shi, Kyoto, Japan
| | - Hiromu Ito
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
| | - Shuichi Matsuda
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
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Schellenberg F, Taylor WR, Trepczynski A, List R, Kutzner I, Schütz P, Duda GN, Lorenzetti S. Evaluation of the accuracy of musculoskeletal simulation during squats by means of instrumented knee prostheses. Med Eng Phys 2018; 61:95-99. [PMID: 30282587 DOI: 10.1016/j.medengphy.2018.09.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 08/08/2018] [Accepted: 09/16/2018] [Indexed: 11/28/2022]
Abstract
Standard musculoskeletal simulation tools now offer widespread access to internal loading conditions for use in improving rehabilitation concepts or training programmes. However, despite broad reliance on their outcome, the accuracy of such loading estimations, specifically in deep knee flexion, remains generally unknown. The aim of this study was to evaluate the error of tibio-femoral joint contact force (JCF) calculations using musculoskeletal simulation compared to in vivo measured JCFs in subjects with instrumented total knee endoprostheses during squat exercises. Using the early but common "Gait2392_simbody" (OpenSim) scaled musculoskeletal models, tibio-femoral JCFs were calculated in 6 subjects for 5 repetitions of squats. Tibio-femoral JCFs of 0.8-3.2 times bodyweight (BW) were measured. While the musculoskeletal simulations underestimated the measured knee JCFs at low flexion angles, an average error of less than 20% was achieved between approximately 25°-60° knee flexion. With an average error that behaved almost linearly with knee flexion angle, an overestimation of approximately 60% was observed at deep flexion (ca. 80°), with an absolute maximum error of ca. 1.9BW. Our data indicate that loading estimations from early musculoskeletal gait models at both high and low knee joint flexion angles should be interpreted carefully.
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Affiliation(s)
- Florian Schellenberg
- Institute for Biomechanics, ETH Zurich, Leopold-Ruzicka-Weg 4, 8093 Zürich, Switzerland
| | - William R Taylor
- Institute for Biomechanics, ETH Zurich, Leopold-Ruzicka-Weg 4, 8093 Zürich, Switzerland.
| | - Adam Trepczynski
- Julius Wolff Institute, Charité - Universitätsmedizin Berlin, Germany
| | - Renate List
- Institute for Biomechanics, ETH Zurich, Leopold-Ruzicka-Weg 4, 8093 Zürich, Switzerland
| | - Ines Kutzner
- Julius Wolff Institute, Charité - Universitätsmedizin Berlin, Germany
| | - Pascal Schütz
- Institute for Biomechanics, ETH Zurich, Leopold-Ruzicka-Weg 4, 8093 Zürich, Switzerland
| | - Georg N Duda
- Julius Wolff Institute, Charité - Universitätsmedizin Berlin, Germany
| | - Silvio Lorenzetti
- Institute for Biomechanics, ETH Zurich, Leopold-Ruzicka-Weg 4, 8093 Zürich, Switzerland; Swiss Federal Institute of Sport Magglingen, SFISM, Magglingen, Switzerland
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20
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Twiggs JG, Wakelin EA, Roe JP, Dickison DM, Fritsch BA, Miles BP, Ruys AJ. Patient-Specific Simulated Dynamics After Total Knee Arthroplasty Correlate With Patient-Reported Outcomes. J Arthroplasty 2018; 33:2843-2850. [PMID: 29807792 DOI: 10.1016/j.arth.2018.04.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 04/16/2018] [Accepted: 04/20/2018] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Component alignment variation following total knee arthroplasty (TKA) does not fully explain the instance of long-term postoperative pain. Joint dynamics following TKA vary with component alignment and patient-specific musculoskeletal anatomy. Computational simulations allow joint dynamics outcomes to be studied across populations. This study aims to determine if simulated postoperative TKA joint dynamics correlate with patient-reported outcomes. METHODS Landmarking and 3D registration of implants was performed on 96 segmented postoperative computed tomography scans of TKAs. A cadaver rig-validated platform for generating patient-specific simulation of deep knee bend kinematics was run for each patient. Resultant dynamic outcomes were correlated with a 12-month postoperative Knee Injury and Osteoarthritis Outcome Score (KOOS). A Classification and Regression Tree (CART) was used for determining nonlinear relationships. RESULTS Nonlinear relationships between the KOOS pain score and rollback and dynamic coronal alignment were found to be significant. Combining a dynamic coronal angular change from extension to full flexion between 0° and 4° varus (long leg axis) and measured rollback of no more than 6 mm without rollforward formed a "kinematic safe zone" of outcomes in which the postoperative KOOS score is 10.5 points higher (P = .013). CONCLUSION The study showed statistically significant correlations between kinematic factors in a simulation of postoperative TKA and postoperative KOOS scores. The presence of a dynamic safe zone in the data suggests a potential optimal target for any given individual patient's joint dynamics and the opportunity to preoperatively determine a patient-specific alignment target to achieve those joint dynamics.
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Affiliation(s)
- Joshua G Twiggs
- 360 Knee Systems, Sydney, Australia; Department of Biomedical Engineering, University of Sydney, Sydney, Australia
| | | | - Justin P Roe
- North Sydney Orthopaedic and Sports Medicine Centre, The Mater Hospital, North Sydney, Australia
| | | | | | | | - Andrew J Ruys
- Department of Biomedical Engineering, University of Sydney, Sydney, Australia
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21
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Tanaka Y, Nakamura S, Kuriyama S, Nishitani K, Ito H, Furu M, Watanabe M, Matsuda S. Medial tilting of the joint line in posterior stabilized total knee arthroplasty increases contact force and stress. Clin Biomech (Bristol, Avon) 2018; 53:54-59. [PMID: 29448081 DOI: 10.1016/j.clinbiomech.2018.02.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 12/17/2017] [Accepted: 02/08/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Kinematically aligned total knee arthroplasty is based on the concept to represent the premorbid joint alignment with cruciate-retaining implants, characterized by medial tilt and internal rotation. However, kinematic and kinetic effects of kinematically aligned total knee arthroplasty with posterior-stabilized implants is unknown. The purpose of this study was to examine the effect of medial tilting of the joint line with posterior-stabilized implants. METHODS A mechanical alignment model, and medial tilt 3° and 5° models were constructed. Knee kinematics and contact forces were simulated using a musculoskeletal computer simulation model. Contact stresses on the tibiofemoral joint and the post area were then calculated using finite element analysis. FINDINGS From 0° to 120° of knee flexion, greater external rotation of the femoral component was observed in medial tilt models (-0.6°, 1.8° and 4.2° in mechanical alignment, medial tilt 3° and medial tilt 5° models, respectively). The peak contact stresses on the tibiofemoral joint and the post area at 120° of knee flexion were higher in medial tilt models. The peak contact stresses on the post area in medial tilt 3° and 5° models were 2.2 and 3.8 times greater than that in mechanical alignment model, respectively. INTERPRETATION Medial tilting of the joint line causes greater axial rotation even with posterior-stabilized implants, which can represent near-normal kinematics. However, medial tilting of the joint line in total knee arthroplasty with posterior-stabilized implants may have a higher risk for polyethylene wear at the tibiofemoral joint and post area, leading to subsequent component loosening.
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Affiliation(s)
- Yoshihisa Tanaka
- Department of Orthopaedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Shinichiro Nakamura
- Department of Orthopaedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
| | - Shinichi Kuriyama
- Department of Orthopaedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Kohei Nishitani
- Department of Orthopaedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Hiromu Ito
- Department of Orthopaedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Moritoshi Furu
- Department of Orthopaedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Mutsumi Watanabe
- Department of Orthopaedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Shuichi Matsuda
- Department of Orthopaedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
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22
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Matsuda S. CORR Insights®: Femoral Component External Rotation Affects Knee Biomechanics: A Computational Model of Posterior-stabilized TKA. Clin Orthop Relat Res 2018. [PMID: 29529626 PMCID: PMC5919230 DOI: 10.1007/s11999.0000000000000093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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23
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Watanabe M, Kuriyama S, Nakamura S, Tanaka Y, Nishitani K, Furu M, Ito H, Matsuda S. Varus femoral and tibial coronal alignments result in different kinematics and kinetics after total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 2017; 25:3459-3466. [PMID: 28484791 DOI: 10.1007/s00167-017-4570-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 05/03/2017] [Indexed: 11/25/2022]
Abstract
PURPOSE Abnormal knee motion under various conditions has been described after total knee arthroplasty (TKA). However, differences in kinematics and kinetics of knees with varus femoral versus varus tibial alignment have not been evaluated. It was hypothesized that varus femoral and tibial alignments have the same impact on knee motion. METHODS A musculoskeletal computer simulation was used. Femoral and tibial alignment in the coronal plane was each varied from neutral to 5° of varus in 1° increments. Lift-off, defined as an intercomponent distance of >2 mm, and tibiofemoral contact forces were evaluated during gait up to 60° of knee flexion. Knee kinematics and contact stresses were also examined during squat, with up to 130° of knee flexion. RESULTS During gait, lift-off occurred readily with more than 3° of varus tibial alignment and slight lateral joint laxity. In contrast, lift-off did not occur with varus femoral or tibial alignment of up to 5° during squat. Peak medial contact forces with varus femoral alignment were approximately twice those observed with varus tibial alignment. The lowest points of the femoral condyles moved internally with varus femoral alignment, contrary to the kinematics with neutral or varus tibial alignment. On the other hand, there was femoral medial sliding and edge loading against the tibia in mid-flexion with varus tibial alignment. CONCLUSION Varus femoral alignment affects the non-physiological rotational movement of the tibiofemoral joint, whereas varus tibial alignment causes medial-lateral instability during mid-flexion. Varus femoral and tibial alignments might lead to post-TKA discomfort and unreliability.
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Affiliation(s)
- Mutsumi Watanabe
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan
| | - Shinichi Kuriyama
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan.
| | - Shinichiro Nakamura
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan
| | - Yoshihisa Tanaka
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan
| | - Kohei Nishitani
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan
| | - Moritoshi Furu
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan
| | - Hiromu Ito
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan
| | - Shuichi Matsuda
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan
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24
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Superior-inferior position of patellar component affects patellofemoral kinematics and contact forces in computer simulation. Clin Biomech (Bristol, Avon) 2017; 45:19-24. [PMID: 28437676 DOI: 10.1016/j.clinbiomech.2017.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 04/08/2017] [Accepted: 04/13/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND Anterior knee pain has been reported as a major postoperative complication after total knee arthroplasty, which may lead to patient dissatisfaction. Rotational alignment and the medial-lateral position correlate with patellar maltracking, which can cause knee pain postoperatively. However, the superior-inferior position of the patellar component has not been investigated. The purpose of the current study was to investigate the effects of the patellar superior-inferior position on patellofemoral kinematics and kinetics. METHODS Superior, central, and inferior models with a dome patellar component were constructed. In the superior and inferior models, the position of the patellar component translated superiorly and inferiorly, respectively, by 3mm, relative to the center model. Kinematics of the patellar component, quadriceps force, and patellofemoral contact force were calculated using a computer simulation during a squatting activity in a weight-bearing deep knee bend. FINDINGS In the inferior model, the flexion angle, relative to the tibial component, was the greatest among all models. The inferior model showed an 18.0%, 36.5%, and 22.7% increase in the maximum quadriceps force, the maximum medial patellofemoral force, and the maximum lateral patellofemoral force, respectively, compared with the superior model. INTERPRETATION Superior-inferior positions affected patellofemoral kinematic and kinetics. Surgeons should avoid the inferior position of the patellar component, because the inferior positioned model showed greater quadriceps and patellofemoral force, resulting in a potential risk for anterior knee pain and component loosening.
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Nakamura S, Tian Y, Tanaka Y, Kuriyama S, Ito H, Furu M, Matsuda S. The effects of kinematically aligned total knee arthroplasty on stress at the medial tibia: A case study for varus knee. Bone Joint Res 2017; 6:43-51. [PMID: 28077396 PMCID: PMC5301901 DOI: 10.1302/2046-3758.61.bjr-2016-0090.r1] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 11/21/2016] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES Little biomechanical information is available about kinematically aligned (KA) total knee arthroplasty (TKA). The purpose of this study was to simulate the kinematics and kinetics after KA TKA and mechanically aligned (MA) TKA with four different limb alignments. MATERIALS AND METHODS Bone models were constructed from one volunteer (normal) and three patients with three different knee deformities (slight, moderate and severe varus). A dynamic musculoskeletal modelling system was used to analyse the kinematics and the tibiofemoral contact force. The contact stress on the tibial insert, and the stress to the resection surface and medial tibial cortex were examined by using finite element analysis. RESULTS In all bone models, posterior translation on the lateral side and external rotation in the KA TKA models were greater than in the MA TKA models. The tibiofemoral force at the medial side was increased in the moderate and severe varus models with KA TKA. In the severe varus model with KA TKA, the contact stress on the tibial insert and the stress to the resection surface and to the medial tibial cortex were increased by 41.5%, 32.2% and 53.7%, respectively, compared with MA TKA, and the bone strain at the medial side was highest among all models. CONCLUSION Near normal kinematics was observed in KA TKA. However, KA TKA increased the contact force, stress and bone strain at the medial side for moderate and severe varus knee models. The application of KA TKA for severe varus knees may be inadequate.Cite this article: S. Nakamura, Y. Tian, Y. Tanaka, S. Kuriyama, H. Ito, M. Furu, S. Matsuda. The effects of kinematically aligned total knee arthroplasty on stress at the medial tibia: A case study for varus knee. Bone Joint Res 2017;6:43-51. DOI: 10.1302/2046-3758.61.BJR-2016-0090.R1.
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Affiliation(s)
- S Nakamura
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, 54 Shogoinkawaharacho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Y Tian
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, 54 Shogoinkawaharacho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Y Tanaka
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, 54 Shogoinkawaharacho, Sakyo-ku, Kyoto 606-8507, Japan
| | - S Kuriyama
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, 54 Shogoinkawaharacho, Sakyo-ku, Kyoto 606-8507, Japan
| | - H Ito
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, 54 Shogoinkawaharacho, Sakyo-ku, Kyoto 606-8507, Japan
| | - M Furu
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, 54 Shogoinkawaharacho, Sakyo-ku, Kyoto 606-8507, Japan
| | - S Matsuda
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, 54 Shogoinkawaharacho, Sakyo-ku, Kyoto 606-8507, Japan
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26
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Tanaka Y, Nakamura S, Kuriyama S, Ito H, Furu M, Komistek RD, Matsuda S. How exactly can computer simulation predict the kinematics and contact status after TKA? Examination in individualized models. Clin Biomech (Bristol, Avon) 2016; 39:65-70. [PMID: 27690304 DOI: 10.1016/j.clinbiomech.2016.09.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 09/14/2016] [Accepted: 09/19/2016] [Indexed: 02/07/2023]
Abstract
BACKGROUND It is unknown whether a computer simulation with simple models can estimate individual in vivo knee kinematics, although some complex models have predicted the knee kinematics. The purposes of this study are first, to validate the accuracy of the computer simulation with our developed model during a squatting activity in a weight-bearing deep knee bend and then, to analyze the contact area and the contact stress of the tri-condylar implants for individual patients. METHODS We compared the anteroposterior (AP) contact positions of medial and lateral condyles calculated by the computer simulation program with the positions measured from the fluoroscopic analysis for three implanted knees. Then the contact area and the stress including the third condyle were calculated individually using finite element (FE) analysis. FINDINGS The motion patterns were similar in the simulation program and the fluoroscopic surveillance. Our developed model could nearly estimate the individual in vivo knee kinematics. The mean and maximum differences of the AP contact positions were 1.0mm and 2.5mm, respectively. At 120° of knee flexion, the contact area at the third condyle was wider than the both condyles. The mean maximum contact stress at the third condyle was lower than the both condyles at 90° and 120° of knee flexion. INTERPRETATION Individual bone models are required to estimate in vivo knee kinematics in our simple model. The tri-condylar implant seems to be safe for deep flexion activities due to the wide contact area and low contact stress.
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Affiliation(s)
- Yoshihisa Tanaka
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Shinichiro Nakamura
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
| | - Shinichi Kuriyama
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Hiromu Ito
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Moritoshi Furu
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Richard D Komistek
- Center for Musculoskeletal Research, University of Tennessee, Knoxville, TN, USA
| | - Shuichi Matsuda
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
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Ding Z, Nolte D, Kit Tsang C, Cleather DJ, Kedgley AE, Bull AMJ. In Vivo Knee Contact Force Prediction Using Patient-Specific Musculoskeletal Geometry in a Segment-Based Computational Model. J Biomech Eng 2016; 138:021018. [DOI: 10.1115/1.4032412] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Indexed: 11/08/2022]
Abstract
Segment-based musculoskeletal models allow the prediction of muscle, ligament, and joint forces without making assumptions regarding joint degrees-of-freedom (DOF). The dataset published for the “Grand Challenge Competition to Predict in vivo Knee Loads” provides directly measured tibiofemoral contact forces for activities of daily living (ADL). For the Sixth Grand Challenge Competition to Predict in vivo Knee Loads, blinded results for “smooth” and “bouncy” gait trials were predicted using a customized patient-specific musculoskeletal model. For an unblinded comparison, the following modifications were made to improve the predictions: further customizations, including modifications to the knee center of rotation; reductions to the maximum allowable muscle forces to represent known loss of strength in knee arthroplasty patients; and a kinematic constraint to the hip joint to address the sensitivity of the segment-based approach to motion tracking artifact. For validation, the improved model was applied to normal gait, squat, and sit-to-stand for three subjects. Comparisons of the predictions with measured contact forces showed that segment-based musculoskeletal models using patient-specific input data can estimate tibiofemoral contact forces with root mean square errors (RMSEs) of 0.48–0.65 times body weight (BW) for normal gait trials. Comparisons between measured and predicted tibiofemoral contact forces yielded an average coefficient of determination of 0.81 and RMSEs of 0.46–1.01 times BW for squatting and 0.70–0.99 times BW for sit-to-stand tasks. This is comparable to the best validations in the literature using alternative models.
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Affiliation(s)
- Ziyun Ding
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK e-mail:
| | - Daniel Nolte
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK e-mail:
| | - Chui Kit Tsang
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK e-mail:
| | - Daniel J. Cleather
- School of Sport, Health and Applied Science, St Mary's University, Waldegrave Road, Twickenham TW1 4SX, UK e-mail:
| | - Angela E. Kedgley
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK e-mail:
| | - Anthony M. J. Bull
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK e-mail:
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Kinematic alignment produces near-normal knee motion but increases contact stress after total knee arthroplasty: A case study on a single implant design. Knee 2015; 22:206-12. [PMID: 25813759 DOI: 10.1016/j.knee.2015.02.019] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 02/09/2015] [Accepted: 02/24/2015] [Indexed: 02/02/2023]
Abstract
BACKGROUND Kinematically aligned total knee arthroplasty (TKA) is of increasing interest because this method might improve postoperative patient satisfaction. In kinematic alignment the femoral component is implanted in a slightly more valgus and internally rotated position, and the tibial component is implanted in a slightly more varus and internally rotated position, than in mechanical alignment. However, the biomechanics of kinematically aligned TKA remain largely unknown. The aim of this study was to compare the kinematics and contact stresses of mechanically and kinematically aligned TKAs. METHODS A musculoskeletal computer simulation was used to determine the effects of mechanically or kinematically aligned TKA. Knee kinematics were examined for mechanically aligned, kinematically aligned, and kinematically aligned outlier models. Patellofemoral and tibiofemoral contact forces were measured using finite element analysis. RESULTS Greater femoral rollback and more external rotation of the femoral component were observed with kinematically aligned TKA than mechanically aligned TKA. However, patellofemoral and tibiofemoral contact stresses were increased in kinematically aligned TKA. CONCLUSIONS These findings suggest that kinematically aligned TKA produces near-normal knee kinematics, but that concerns for long-term outcome might arise because of high contact stresses.
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