Development of a Tibial Slider to Evaluate and Validate a Finite Element Model for Friction in Total Knee Implants

2000 ◽  
Author(s):  
Michael D. Nowak ◽  
Kenneth Shaw ◽  
Courtland Lewis
Keyword(s):  
United States ◽  
Finite Element ◽  
Knee Replacement ◽  
Severe Pain ◽  
Element Model ◽  
The United States ◽  
Loss Of Function ◽  
Articular Surfaces ◽  
Joint Disorder ◽  
Total Knee

Abstract More than 200,000 people in the United States annually undergo knee replacement as a means of diminishing pain and stiffness and restoring mobility, and the number is expected to increase with further advancements in joint replacement procedures [Duke, 1999]. Total knee replacement is performed on people with severe degenerative joint disorder such as osteoarthritis in which the articular surfaces of the knee deteriorate, leading to severe pain, limitation or loss of function and/or deformity of the joint.

A finite element model for evaluation of tibial prosthesis-bone interface in total knee replacement

1992 ◽  
Vol 25 (12) ◽  
pp. 1413-1424 ◽  
Author(s):  
R.L. Rakotomanana ◽  
P.F. Leyvraz ◽  
A. Curnier ◽  
J.H. Heegaard ◽  
P.J. Rubin
Keyword(s):  
Finite Element ◽  
Total Knee Replacement ◽  
Finite Element Model ◽  
Knee Replacement ◽  
Element Model ◽  
Bone Interface ◽  
Total Knee

The Effect of Micro Grooving on Goat Total Knee Replacement: A Finite Element Study

2020 ◽  
Author(s):  
Morshed Khandaker ◽  
Onur Can Kalay ◽  
Fatih Karpat ◽  
Amgad Haleem ◽  
Wendy Williams ◽  
...  
Keyword(s):  
Finite Element ◽  
Total Knee Replacement ◽  
Knee Replacement ◽  
Joint Replacement ◽  
Mechanical Performance ◽  
The United States ◽  
Cement Interface ◽  
Bonding Failure ◽  
Total Knee ◽  
Joint Prostheses

Abstract A method to improve the mechanical fixation of a total knee replacement (TKR) implant is clinically important and is the purpose of this study. More than one million joint replacement procedures are performed in people each year in the United States, and experts predict the number to increase six-fold by the year 2030. Whether cemented or uncemented, joint prostheses may destabilize over time and necessitate revision. Approximately 40,000 hip arthroplasty surgeries have to be revised each year and the rate is expected to increase by approximately 140% (and by 600% for total knee replacement) over the next 25 years. In veterinary surgery, joint replacement has a long history and the phenomenon of surgical revision is also well recognized. For the betterment of both people and animals, improving the longevity of arthroplasty devices is of the utmost clinical importance, and towards that end, several strategies are under investigation. One approach that we explore in the present research is to improve the biomechanical performance of cemented implant systems by altering the implant surface architecture in a way that facilitates its cement bonding capacity. Beginning with the Charnley system, early femoral stems were polished smooth, but a number of subsequent designs have featured a roughened surface — created with bead or grit blasting — to improve cement bonding. Failure at the implant-cement interface remains an issue with these newer designs, leading us to explore in this present research an alternate, novel approach to surface alteration — specifically, laser microgrooving. This study used various microgrooves architectures that is feasible using a laser micromachining process on a tibia tray (TT) for the goat TKR. Developing the laser microgrooving (LM) procedure, we hypothesized feasibility in producing parallel microgrooves of precise dimensions and spacing on both flat and round metallic surfaces. We further hypothesized that laser microgrooving would increase surface area and roughness of the cement interface of test metallic implants and that such would translate into an improved acute mechanical performance as assessed in vitro under both static and cyclic loads. The objective was to develop a computational model to determine the effect of LIM on the tibial tray to the mechanical stimuli distributions from implant to bone using the finite element method. This study designed goat TT 3D solid model from a computer topography (CT) images, out of which three different laser microgrooves were engraved on TT sample by varying depth, height and space between two adjacent grooves. The simulation test results concluded that microgrooves acchitecures positively influence microstrain behavior around the implant/bone interfaces. There is a higher amount of strain observed for microgroove implant/bone samples compared to non-groove implant/bone samples. Thus, the laser-induced microgrooves have the potential to be used clinically in TKR components.

EPIDEMIOLOGY OF TOTAL KNEE REPLACEMENT IN THE UNITED STATES MEDICARE POPULATION

2005 ◽  
Vol 87 (6) ◽  
pp. 1222-1228 ◽  
Author(s):  
NIZAR N. MAHOMED ◽  
JANE BARRETT ◽  
JEFFREY N. KATZ ◽  
JOHN A. BARON ◽  
JOHN WRIGHT ◽  
...  
Keyword(s):  
United States ◽  
Total Knee Replacement ◽  
Knee Replacement ◽  
The United States ◽  
Medicare Population ◽  
Total Knee

scholarly journals Pre-operative Education for Total Knee Replacement: A Pilot Survey

2018 ◽  
Author(s):  
Renee Causey-Upton ◽  
Dana Howell ◽  
Patrick Kitzman ◽  
Melba Custer ◽  
Emily Dressler
Keyword(s):  
United States ◽  
Physical Therapy ◽  
Occupational Therapy ◽  
Total Knee Replacement ◽  
Knee Replacement ◽  
The United States ◽  
Education Programs ◽  
Delivery Methods ◽  
Pilot Survey ◽  
Total Knee

Purpose: The structure of pre-operative education programs used nationally for patients prior to total knee replacement (TKR) surgery has not been identified previously, thus hospitals across the United States lack a common standard for this pre-operative education to ensure best patient outcomes. The purpose of this pilot survey study was to describe the content, providers, and delivery methods currently utilized to deliver pre-operative education for total knee replacement in the United States. Method: Data were collected using an online survey developed by the authors based on review of literature and three pre-operative programs, and was distributed through the Research Electronic Data Capture (REDCap). The survey consisted of 16 questions, including 12 closed-ended and four open-ended items. Participants were identified through convenience sampling using contacts of the first author and an internet search of hospitals that provide pre-operative education. Seven professional participants total from nursing, physical therapy, and occupational therapy completed the survey. Descriptive statistics were used for data analysis of the 12 quantitative questions to determine frequency and percentages of responses. Responses on the four open-ended survey items, as well as participant responses of “other” for question items, were recorded and collated from individual survey responses. Results: Pre-operative education provider teams for total knee replacements most frequently consisted of nursing, physical therapy, and occupational therapy staff. Most education programs were provided two weeks prior to surgery in a group format, with the majority of programs being delivered in a single session lasting between 1 and 1.5 hours. Verbal and written instruction were the most commonly utilized methods to deliver education. Individual patient programs included a variety of topics, ranging from what to expect while in the hospital, self-care, adaptive equipment, and home safety being some of the most commonly included content. Conclusions: This pilot study provides a framework to describe the structure of pre-operative total knee replacement education nationally, and can be used to guide a future large scale survey to fully describe the content, providers, and delivery methods of pre-operative education for this population across the United States using a representative sample.

Comparison of US and European Bolt Load Calculation Methods vs. Bolt Load Predictions From a Finite Element Model

1997 ◽  
Author(s):  
Karl-H. Grote ◽  
Hans E. Westberg
Keyword(s):  
United States ◽  
Finite Element ◽  
Finite Element Model ◽  
Mechanical Design ◽  
Element Model ◽  
The United States ◽  
Bolted Joint ◽  
Calculation Methods ◽  
Load Calculation ◽  
The Usa

Abstract The bolted joint is by far the most used connector and joint in mechanical design applications. The authors have years of experience in the calculation of these joints in Europe and the United States. This paper compares the results from currently used bolt load calculation methods in Germany ([1,2,3,], VDI-2230) and methods used in the USA and Canada to the results obtained from a finite element model of a bolted joint. For detailed information see [4].

scholarly journals Total Knee Replacement: Subject-Specific Modeling, Finite Element Analysis, and Evaluation of Dynamic Activities

2021 ◽  
Vol 9 ◽  
Author(s):  
Iliana Loi ◽  
Dimitar Stanev ◽  
Konstantinos Moustakas
Keyword(s):  
Finite Element ◽  
Total Knee Replacement ◽  
Finite Element Model ◽  
Knee Replacement ◽  
Element Model ◽  
Grand Challenge ◽  
Data Set ◽  
Subject Specific ◽  
Total Knee ◽  
Contact Pressures

This study presents a semi-automatic framework to create subject-specific total knee replacement finite element models, which can be used to analyze locomotion patterns and evaluate knee dynamics. In recent years, much scientific attention was attracted to pre-clinical optimization of customized total knee replacement operations through computational modeling to minimize post-operational adverse effects. However, the time-consuming and laborious process of developing a subject-specific finite element model poses an obstacle to the latter. One of this work's main goals is to automate the finite element model development process, which speeds up the proposed framework and makes it viable for practical applications. This pipeline's reliability was ratified by developing and validating a subject-specific total knee replacement model based on the 6th SimTK Grand Challenge data set. The model was validated by analyzing contact pressures on the tibial insert in relation to the patient's gait and analysis of tibial contact forces, which were found to be in accordance with the ones provided by the Grand Challenge data set. Subsequently, a sensitivity analysis was carried out to assess the influence of modeling choices on tibial insert's contact pressures and determine possible uncertainties on the models produced by the framework. Parameters, such as the position of ligament origin points, ligament stiffness, reference strain, and implant-bone alignment were used for the sensitivity study. Notably, it was found that changes in the alignment of the femoral component in reference to the knee bones significantly affect the load distribution at the tibiofemoral joint, with an increase of 206.48% to be observed at contact pressures during 5° internal rotation. Overall, the models produced by this pipeline can be further used to optimize and personalize surgery by evaluating the best surgical parameters in a simulated manner before the actual surgery.

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