Musculoskeletal Model During Treadmill Gait

2013 ◽  
Author(s):  
Mohammad Kia ◽  
Trent M. Guess ◽  
Antonis P. Stylianou
Keyword(s):  
Computational Models ◽  
Clinical Applications ◽  
Implant Design ◽  
Detailed Knowledge ◽  
Total Knee Replacements ◽  
Knee Replacements ◽  
Total Knee ◽  
Clinical Tools ◽  
Joint Loads

Detailed knowledge of joint kinematics and loading is essential for improving the design and surgical outcomes of total knee replacements as well as tissue engineering applications. Dynamic loading is a contributing factor in the development of joint osteoarthritis and in total knee replacement wear. Dynamic computational models in which muscle, ligament, and joint loads are predicted concurrently would be ideal clinical tools for surgery planning and for implant design. An important obstacle in clinical applications of computational models is validation of the estimated in-vivo loads.

scholarly journals SPECT/CT Assessment of In-Vivo Loading of the Knee Correlates with Polyethylene Deformation in Retrieved Total Knee Arthroplasty

Tomography ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 180-188
Author(s):  
Harry Hothi ◽  
Arianna Cerquiglini ◽  
Lukas Büel ◽  
Johann Henckel ◽  
Lukas B. Moser ◽  
...  
Keyword(s):  
Distribution Patterns ◽  
Tracer Uptake ◽  
Medial Compartment ◽  
Lateral Side ◽  
Imaging Data ◽  
Total Knee Replacements ◽  
Knee Replacements ◽  
Total Knee ◽  
In Vivo Loading

Background: SPECT/CT distribution patterns in patients with total knee replacements have previously been correlated with factors such as time of implantation, implant type and alignment. It is unknown, however, if an increased and more extended bone tracer uptake (BTU) in SPECT/CT, representing loading of the joint, correlates with findings from retrieval studies. The aim of this study was to further understand this subject. Materials and Methods: 62 retrieved TKA were included. SPECT/CT was performed prior to revision. Quantitative and qualitative medio-lateral comparisons of BTU intensity and distribution in the tibia were performed. Retrieval analysis was performed with a micro-CT method to assess the thickness differences between medial and lateral sides of polyethylene inserts with symmetrical designs. Results: In the subgroup of TKA with asymmetrical SPECT/CT distribution, there was a significant correlation between retrieval and medical imaging data (p = 0.0355): patients showing a more extended BTU in the medial compartment also had a significantly thinner insert in the medial compartment, and vice versa in the lateral side. Conclusion: This is the first study comparing BTU distribution patterns and retrieval findings. Our results support the hypothesis that SPECT/CT is able to identify bone activity due to implant position and loading.

Sagittal curvature of total knee replacements predicts in vivo kinematics

2006 ◽  
Vol 39 ◽  
pp. S129
Author(s):  
L. Dürselen ◽  
O. Kessler ◽  
S. Banks ◽  
H. Mannel ◽  
F. Marin
Keyword(s):  
Total Knee Replacements ◽  
In Vivo Kinematics ◽  
Knee Replacements ◽  
Total Knee

In Vivo Wear Performance of Cobalt-Chromium Versus Oxidized Zirconium Femoral Total Knee Replacements

2016 ◽  
Vol 31 (1) ◽  
pp. 137-141 ◽  
Author(s):  
Trevor C. Gascoyne ◽  
Matthew G. Teeter ◽  
Leah E. Guenther ◽  
Colin D. Burnell ◽  
Eric R. Bohm ◽  
...  
Keyword(s):  
Cobalt Chromium ◽  
Wear Performance ◽  
Total Knee Replacements ◽  
Knee Replacements ◽  
Oxidized Zirconium ◽  
Total Knee

scholarly journals Peri-implant bone strains and micro-motion following in vivo service: A postmortem retrieval study of 22 tibial components from total knee replacements

2013 ◽  
Vol 32 (3) ◽  
pp. 355-361 ◽  
Author(s):  
Kenneth A. Mann ◽  
Mark A. Miller ◽  
Jacklyn R. Goodheart ◽  
Timothy H. Izant ◽  
Richard J. Cleary
Keyword(s):  
Total Knee Replacements ◽  
Retrieval Study ◽  
Knee Replacements ◽  
Bone Strains ◽  
Total Knee ◽  
Micro Motion

In Vivo Fluoroscopic Analysis Of Fixed-Bearing Total Knee Replacements

2003 ◽  
Vol 410 ◽  
pp. 114-130 ◽  
Author(s):  
Douglas A. Dennis ◽  
Richard D. Komistek ◽  
Mohamed R. Mahfouz
Keyword(s):  
Fixed Bearing ◽  
Total Knee Replacements ◽  
Knee Replacements ◽  
Total Knee

An efficient and robust simulator for wear of total knee replacements

2020 ◽  
Vol 234 (9) ◽  
pp. 921-930
Author(s):  
Ansgar Burchardt ◽  
Christian Abicht ◽  
Oliver Sander
Keyword(s):  
Implant Design ◽  
In Vitro Tests ◽  
Simulation Methods ◽  
Contact Algorithm ◽  
Total Knee Replacements ◽  
Compliance Testing ◽  
Knee Replacements ◽  
Physical Tests ◽  
Total Knee ◽  
Simulation Results

Wear on total knee replacements is an important criterion for their performance characteristics. Numerical simulations of such wear have seen increasing attention over the last years. They have the potential to be much faster and less expensive than the in vitro tests in use today. While it is unlikely that in silico tests will replace actual physical tests in the foreseeable future, a judicious combination of both approaches can help making both implant design and pre-clinical testing quicker and more cost-effective. The challenge today for the design of simulation methods is to obtain results that convey quantitative information and to do so quickly and reliably. This involves the choice of mathematical models as well as the numerical tools used to solve them. The correctness of the choice can only be validated by comparing with experimental results. In this article, we present finite element simulations of the wear in total knee replacements during the gait cycle standardized in the ISO 14243-1 document, used for compliance testing in several countries. As the ISO 14243-1 standard is precisely defined and publicly available, it can serve as an excellent benchmark for comparison of wear simulation methods. We use comparatively simple wear and material models, but we solve them using a new wear algorithm that combines extrapolation of the geometry changes with a contact algorithm based on nonsmooth multigrid ideas. The contact algorithm works without Lagrange multipliers and penalty parameters, achieving unparalleled stability and efficiency. We compare our simulation results with the experimental data from physical tests using two different actual total knee replacements. Even though the model is simple, we can predict the total mass loss due to wear after 5-million gait cycles, and we observe a good match between the wear patterns seen in experiments and our simulation results. When compared with a state-of-the-art penalty-based solver for the same model, we measure a roughly fivefold increase of execution speed.

scholarly journals Changes in microgaps, micromotion, and trabecular strain from interlocked cement-trabecular bone interfaces in total knee replacements with in vivo service

2015 ◽  
Vol 34 (6) ◽  
pp. 1019-1025 ◽  
Author(s):  
Mark A. Miller ◽  
Jacklyn R. Goodheart ◽  
Benjamin Khechen ◽  
Dennis Janssen ◽  
Kenneth A. Mann
Keyword(s):  
Trabecular Bone ◽  
Total Knee Replacements ◽  
Knee Replacements ◽  
Total Knee
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