scholarly journals Evaluation of a Surrogate Contact Model in Force-Dependent Kinematic Simulations of Total Knee Replacement

2017 ◽  
Vol 139 (8) ◽  
Author(s):  
Marco A. Marra ◽  
Michael S. Andersen ◽  
Michael Damsgaard ◽  
Bart F. J. M. Koopman ◽  
Dennis Janssen ◽  
...  
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Reference Model ◽  
Knee Kinematics ◽  
Contact Model ◽  
Related Factors ◽  
Joint Contact ◽  
Total Knee ◽  
Parametric Analyses

Knowing the forces in the human body is of great clinical interest and musculoskeletal (MS) models are the most commonly used tool to estimate them in vivo. Unfortunately, the process of computing muscle, joint contact, and ligament forces simultaneously is computationally highly demanding. The goal of this study was to develop a fast surrogate model of the tibiofemoral (TF) contact in a total knee replacement (TKR) model and apply it to force-dependent kinematic (FDK) simulations of activities of daily living (ADLs). Multiple domains were populated with sample points from the reference TKR contact model, based on reference simulations and design-of-experiments. Artificial neural networks (ANN) learned the relationship between TF pose and loads from the medial and lateral sides of the TKR implant. Normal and right-turn gait, rising-from-a-chair, and a squat were simulated using both surrogate and reference contact models. Compared to the reference contact model, the surrogate contact model predicted TF forces with a root-mean-square error (RMSE) lower than 10 N and TF moments lower than 0.3 N·m over all simulated activities. Secondary knee kinematics were predicted with RMSE lower than 0.2 mm and 0.2 deg. Simulations that used the surrogate contact model ran on average three times faster than those using the reference model, allowing the simulation of a full gait cycle in 4.5 min. This modeling approach proved fast and accurate enough to perform extensive parametric analyses, such as simulating subject-specific variations and surgical-related factors in TKR.

scholarly journals A Hertzian Integrated Contact Model of the Total Knee Replacement Implant for the Estimation of Joint Contact Forces

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Tien Tuan Dao ◽  
Philippe Pouletaut
Keyword(s):  
Total Knee Replacement ◽  
Elastic Properties ◽  
Knee Replacement ◽  
Material Properties ◽  
Contact Forces ◽  
Contact Model ◽  
Patient Specific ◽  
Joint Contact ◽  
Total Knee

The prediction of lower limb muscle and contact forces may provide useful knowledge to assist the clinicians in the diagnosis as well as in the development of appropriate treatment for musculoskeletal disorders. Research studies have commonly estimated joint contact forces using model-based muscle force estimation due to the lack of a reliable contact model and material properties. The objective of this present study was to develop a Hertzian integrated contact model. Then, in vivo elastic properties of the Total Knee Replacement (TKR) implant were identified using in vivo contact forces leading to providing reliable material properties for modeling purposes. First, a patient specific rigid musculoskeletal model was built. Second, a STL-based implant model was designed to compute the contact area evolutions during gait motions. Finally, a Hertzian integrated contact model was defined for the in vivo identification of elastic properties (Young’s modulus and Poisson coefficient) of the instrumented TKR implant. Our study showed a potential use of a new approach to predict the contact forces without knowledge of muscle forces. Thus, the outcomes may lead to accurate and reliable prediction of human joint contact forces for new case study.

Calculated Axial Forces at the Knee in Total Knee Replacement Patients During Chair and Stair Activities

2012 ◽  
Author(s):  
Hannah J. Lundberg ◽  
Christopher B. Knowlton ◽  
Diego Orozco ◽  
Markus A. Wimmer
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Contact Forces ◽  
Force Output ◽  
Stair Ascent ◽  
Numeric Model ◽  
Axial Forces ◽  
Joint Contact ◽  
Total Knee

Knowledge of in vivo knee contact forces is essential for evaluating total knee replacement (TKR) designs. This is particularly true for activities other than walking, because there is still a limited understanding of its impact on wear. It has been shown that wear scars from retrieved implants have obvious differences compared with simulator tested components in both size of worn area and in damage mode. The divergence could be related to the omission of other activities than walking when testing components in the simulator. The purpose of this study was to use a parametric numerical model for predicting joint contact forces during stair ascent/descent and chair sitting/rising and compare those to measured forces from a database. We hypothesized that the contact force output of the numeric model would be similar to the measured forces.

scholarly journals Enhanced patella tracking in rotating platform total knee replacements, friend or foe? A case of iliotibial band impingement by rotating polyethylene insert

2019 ◽  
Vol 26 (2) ◽  
pp. 99-104
Author(s):  
Michelle Kar Lam Li ◽  
Lawrence Chun Man Lau ◽  
Yuk Wah Hung ◽  
Ka Bon Kwok ◽  
Alexander Pak Hin Chan ◽  
...  
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Knee Kinematics ◽  
Iliotibial Band ◽  
Polyethylene Insert ◽  
Rotating Platform ◽  
Total Knee Replacements ◽  
Knee Replacements ◽  
Total Knee ◽  
Patella Tracking

Rotating platform total knee replacement implants have been marketed to allow more precise approximation of normal knee kinematics and enhance patella tracking. At liberty of rotation, the distinct mobile polyethylene insert design does have its pitfalls in spite of purported merits. We report a case of lateral knee pain following rotating platform total knee replacement, attributable to iliotibial band impingement by the rotating polyethylene insert. Prompt treatment via arthroscopic release circumvented a traumatic and costly revision procedure.

scholarly journals Urinary Prothrombin Fragment 1+2 in relation to Development of Non-Symptomatic and Symptomatic Venous Thromboembolic Events following Total Knee Replacement

Thrombosis ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
Lars C. Borris ◽  
Morten Breindahl ◽  
Michael R. Lassen ◽  
Ákos F. Pap
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Operative Procedure ◽  
Clinical Test ◽  
Prothrombin Fragment ◽  
Venous Thromboembolic Events ◽  
Venous Thromboembolic ◽  
Patients At Risk ◽  
Total Knee

Prothrombin fragment 1+2 is excreted in urine (uF1+2) as a result of in vivo thrombin generation and can be a marker of coagulation status after an operative procedure. This study compared uF1+2 levels in patients with symptomatic and non-symptomatic venous thromboembolism (VTE) after total knee replacement (TKR) and in event-free sex- and age-matched controls. Significantly higher median uF1+2 levels were seen in the VTE patients on days 1, 3, and the day of venography (mostly day 7) after TKR compared with controls. The uF1+2 levels tended to be high in some patients with symptomatic VTE; however, the discriminatory efficacy of the test could not be evaluated. In conclusion, this study showed that patients with VTE tend to have significantly higher uF1+2 levels compared with patients without events between days 1 and 7 after TKR surgery. Measurement of uF1+2 could provide a simple, non-invasive clinical test to identify patients at risk of VTE.

The use of synthetic ligaments in the design of an enhanced stability total knee joint replacement

2018 ◽  
Vol 232 (3) ◽  
pp. 282-288
Author(s):  
Michael D Stokes ◽  
Brendan C Greene ◽  
Luke W Pietrykowski ◽  
Taylor M Gambon ◽  
Caroline E Bales ◽  
...  
Keyword(s):  
Total Knee Replacement ◽  
Range Of Motion ◽  
Knee Replacement ◽  
Physical Prototype ◽  
Synthetic Ligament ◽  
Total Knee ◽  
Replacement System ◽  
The Stability ◽  
Replacement Design

Current total knee replacement designs work to address clinically desired knee stability and range of motion through a balance of retained anatomy and added implant geometry. However, simplified implant geometries such as bearing surfaces, posts, and cams are often used to replace complex ligamentous constraints that are sacrificed during most total knee replacement procedures. This article evaluates a novel total knee replacement design that incorporates synthetic ligaments to enhance the stability of the total knee replacement system. It was hypothesized that by incorporating artificial cruciate ligaments into a total knee replacement design at specific locations and lengths, the stability of the total knee replacement could be significantly altered while maintaining active ranges of motion. The ligament attachment mechanisms used in the design were evaluated using a tensile test, and determined to have a safety factor of three with respect to expected ligamentous loading in vivo. Following initial computational modeling of possible ligament orientations, a physical prototype was constructed to verify the function of the design by performing anterior/posterior drawer tests under physiologic load. Synthetic ligament configurations were found to increase total knee replacement stability up to 94% compared to the no-ligament case, while maintaining total knee replacement flexion range of motion between 0° and 120°, indicating that a total knee replacement that incorporates synthetic ligaments with calibrated location and lengths should be able to significantly enhance and control the kinematic performance of a total knee replacement system.

In vivo measurement of total knee replacement wear

The Knee ◽  
2004 ◽  
Vol 11 (3) ◽  
pp. 183-187 ◽  
Author(s):  
C.F Kellett ◽  
A Short ◽  
A Price ◽  
H.S Gill ◽  
D.W Murray
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
In Vivo Measurement ◽  
Total Knee

Computer navigation of soft tissues in total knee replacement: optimizing knee kinematics

2010 ◽  
Vol 21 (6) ◽  
pp. 595-599
Author(s):  
Yogeesh D. Kamat ◽  
Kamran M. Aurakzai ◽  
Richard E. Field ◽  
Ajeya R. Adhikari
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Soft Tissues ◽  
Computer Navigation ◽  
Knee Kinematics ◽  
Total Knee
Sign in / Sign up

Export Citation Format

Share Document