scholarly journals Parametric study of a triboelectric transducer in total knee replacement application

2020 ◽  
Vol 32 (1) ◽  
pp. 16-28 ◽  
Author(s):  
Alwathiqbellah Ibrahim ◽  
Geofrey Yamomo ◽  
Ryan Willing ◽  
Shahrzad Towfighian
Keyword(s):  
Knee Joint ◽  
Total Knee Replacement ◽  
Knee Replacement ◽  
Mechanical Load ◽  
Structural Parameters ◽  
New Technology ◽  
Electrical Signal ◽  
Motion Simulator ◽  
Total Knee ◽  
Self Powered

Triboelectric energy harvesting is a relatively new technology showing promise for biomedical applications. This study investigates a triboelectric energy transducer for potential applications in total knee replacement both as an energy harvester and a sensor. The sensor can be used to monitor loads at the knee joint. The proposed transducer generates an electrical signal that is directly related to the periodic mechanical load from walking. The proportionality between the generated electrical signal and the load transferred to the knee enables triboelectric transducers to be used as self-powered active load sensors. We analyzed the performance of a triboelectric transducer when subjected to simulated gait loading on a joint motion simulator. Two different designs were evaluated: one made of Titanium on Aluminum (Ti-PDMS-Al) and the other made of Titanium on Titanium (Ti-PDMS-Ti). The Ti-PDMS-Ti design generates more power than Ti-PDMS-Al and was used to optimize the structural parameters. Our analysis found these optimal parameters for the Ti-PDMS-Ti design: external resistance of 304 MΩ, a gap of 550 µm, and a thickness of the triboelectric layer of 50 µm. Those parameters were optimized by varying resistance, gap, and the thickness while measuring the power outputs. Using the optimized parameters, the transducer was tested under different axial loads to check the viability of the harvester to act as a self-powered load sensor to estimate the knee loads. The forces transmitted across the knee joint during activities of daily living can be directly measured and used for self-powering, which can lead to improving the total knee implant functions.

Self-Powered Load Sensing Circuitry for Total Knee Replacement

2021 ◽  
pp. 1-1
Author(s):  
Manav Jain ◽  
Nabid Aunjum Hossain ◽  
Shahrzad Towfighian ◽  
Ryan Willing ◽  
Milutin Stanacevic ◽  
...  
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Load Sensing ◽  
Total Knee ◽  
Self Powered

Experimental Evaluation of Sensing and Energy Harvesting Behavior of Implanted Piezoelectric Transducers in Total Knee Replacement

2017 ◽  
Author(s):  
Mohsen Safaei ◽  
Steven R. Anton
Keyword(s):  
Energy Harvesting ◽  
Total Knee Replacement ◽  
Knee Replacement ◽  
Center Of Pressure ◽  
Experimental Testing ◽  
Surgical Techniques ◽  
Piezoelectric Transducers ◽  
Computer Assisted ◽  
Total Knee ◽  
Self Powered

Total knee replacement has been utilized to restore the functionality of diseased knee joints for more than four decades. Today, despite the relatively high level of patient satisfaction, still about 20% of patients are not fulfilled with their surgical outcomes in terms of function and reduction in pain. There is still an ongoing discussion on correlating the postoperative functionality of the joint to intraoperative alignment, which suffers from lack of in vivo data from the knee after surgery. However, it is necessary to mention that using computer assisted surgical techniques, the outcomes of knee replacement procedures have been remarkably improved. In order to obtain information about the knee function after the operation, the design of a self-powered instrumented knee implant is proposed in this study. The design is a total knee replacement ultra high molecular weight polyethylene insert equipped with four piezoelectric transducers distributed in the medial and lateral compartments of the bearing. The piezoelectric elements are employed to measure the axial force applied on the tibial insert through the femoral component of the joint as well as to track the movement in the center of pressure. In addition, generated voltage from the piezoelectrics is harvested and stored to power embedded electronics for further signal conditioning and data transmitting purposes. The performance of the instrumented implant is investigated via experimental testing on a fabricated prototype in terms of sensing and power harvesting capacity. Piezoelectric force and center of pressure measurements are compared to the actual quantities recorded from the load frame and pressure sensitive films in order to evaluate the performance of the sensing system. The output voltage of the piezoelectric transducers is rectified and stored in a capacitor to evaluate the energy harvesting ability of the system. The results show only a small level of error in sensing the force and the location of center of pressure. Additionally, a 4.9 V constant voltage is stored in a 3.3 mF capacitor after 3333 loading cycles. The sensing and energy harvesting results present the promising potential of this system to be used as an integrated self-powered instrumented knee implant.

On the role of knee joint in balance control and postural strategies: Effects of total knee replacement in elderly subjects with knee osteoarthritis

2010 ◽  
Vol 32 (2) ◽  
pp. 155-160 ◽  
Author(s):  
Gérome C. Gauchard ◽  
Guy Vançon ◽  
Philippe Meyer ◽  
Didier Mainard ◽  
Philippe P. Perrin
Keyword(s):  
Knee Joint ◽  
Total Knee Replacement ◽  
Knee Osteoarthritis ◽  
Knee Replacement ◽  
Balance Control ◽  
Elderly Subjects ◽  
Total Knee

scholarly journals Effect of femoral posterior condyle offset on knee joint function after total knee replacement: a network meta-analysis and a sequential retrospective cohort study

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Yimin Zhang ◽  
Jun Wang ◽  
Miao Zhang ◽  
Yun Xu
Keyword(s):  
Knee Joint ◽  
Total Knee Replacement ◽  
Knee Replacement ◽  
Meta Analysis ◽  
Flexion Contracture ◽  
Functional Score ◽  
Knee Score ◽  
Joint Function ◽  
Posterior Condyle ◽  
Total Knee

Abstract Background This study was conducted with the aim to compare the effect of posterior condyle offset (PCO) changes on knee joint function of patients following total knee replacement (TKR). Methods Electronic and manual searches were performed in the PubMed, Embase, and Cochrane Library databases from inception to September 2019. Network meta-analysis combined direct and indirect evidence to assess the weighted mean difference (WMD) and surface under the cumulative ranking curves (SUCRA) of different PCO changes (PCO ≤ − 2 mm, − 2 mm < PCO < 0 mm, 0 mm ≤ PCO < 2 mm and PCO ≥ 2 mm) on knee joint function after TKR. Then 103 OA patients undergoing unilateral TKR were included and the effect of PCO on the postoperative knee function was examined. Results Totally, 5 cohort studies meeting the inclusion criteria were enrolled in this analysis. The results of meta-analysis showed that patients with 0 mm ≤ PCO < 2 mm after TKR had a better recovery of joint function (flexion contracture: 28.67%; KS functional score: 78.67%; KS knee score: 75.00%) than the remaining three groups. However, the knee flexion (77.00%) of patients with PCO ≤ − 2 mm after TKR was superior to the other three groups. Retrospective study also revealed a significant correlation between PCO changes and the flexion contracture, further flexion and KS functional score of patients after TKR, in which each functional knee score of patients with 0 mm ≤ PCO < 2 mm was better than the others. Conclusion These findings suggest a close correlation between PCO magnitude and knee joint function after TKR and that 0 mm ≤ PCO < 2 mm is superior to other changes for joint function after TKR.

scholarly journals RETROSPECTIVE ANALYSIS OF FUNCTIONAL OUTCOME OF TOTAL KNEE REPLACEMENT IN RURAL TEACHING SETUP

2021 ◽  
Vol 9 (12) ◽  
pp. 222-226
Author(s):  
Ketas Mahajan ◽  
Keyword(s):  
Knee Joint ◽  
Total Knee Replacement ◽  
Retrospective Analysis ◽  
Knee Replacement ◽  
Joint Replacement ◽  
Observation Data ◽  
Knee Joint Replacement ◽  
Total Knee ◽  
Set Up ◽  
Rural Teaching

Background:Indian population is mainly residing in two areas- urban and rural. The literature has shown consistent results following knee joint replacement surgeries, however these studies have been done in highly efficient and equipped hospitals in urban areas. Aim: The aim of this study was to compare outcome at a rural set-up with those at a high-end teaching or corporate hospital in urban set-up from published literature. Materials and Methods: This study was an observational and retrospective analysis. Observation data was collected from January, 2020 and April, 2021. This study included follow-up of 60 total knee joint replacements. Results: In our study of total knee joint replacement surgeries in rural teaching set- up, we achieved 95.39% results (excellent) while the remaining 4.61% results were good. Conclusion: This study confirmed that results of total knee replacement are comparable to any other highly well equipped urban center, if all basic surgical principles including aseptic precautions are stringently followed-up. Further the clinical outcomes in our cases was more surgeon dependent rather than technology dependent as all surgeries were performed by one single surgeon.

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