scholarly journals Effect of Patellar Thickness on Knee Flexion in Total Knee Arthroplasty: A Biomechanical and Experimental Study

2021 ◽  
Author(s):  
David Backstein ◽  
Mansour Abolghasemian ◽  
Saeid Samiezadeh ◽  
Amir Sternheim ◽  
Habiba Bougherara ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Knee Prosthesis ◽  
Experimental Studies ◽  
Biomechanical Model ◽  
Functional Consequences ◽  
Computer Based ◽  
Total Knee ◽  
Patellar Thickness

A biomechanical computer-based model was developed to simulate the influence of patellar thickness on passive knee flexion after arthroplasty. Using the computer model of a single-radius, PCL-sacrificing knee prosthesis, a range of patella-implant composite thicknesses was simulated. The biomechanical model was then replicated using two cadaveric knees. A patellar-thickness range of 15mm was applied to each of the knees. Knee flexion was found to decrease exponentially with increased patellar thickness in both the biomechanical and experimental studies. Importantly, this flexion loss followed an exponential pattern with higher patellar thicknesses in both studies. In order to avoid adverse biomechanical and functional consequences, it is recommended to restore patellar thickness to that of the native knee during total knee arthroplasty.

scholarly journals Effect of Patellar Thickness on Knee Flexion in Total Knee Arthroplasty: A Biomechanical and Experimental Study

2021 ◽  
Author(s):  
David Backstein
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Knee Prosthesis ◽  
Experimental Studies ◽  
Biomechanical Model ◽  
Functional Consequences ◽  
Computer Based ◽  
Total Knee ◽  
Patellar Thickness

A biomechanical computer-based model was developed to simulate the influence of patellar thickness on passive knee flexion after arthroplasty. Using the computer model of a single-radius, PCL-sacrificing knee prosthesis, a range of patella-implant composite thicknesses was simulated. The biomechanical model was then replicated using two cadaveric knees. A patellar-thickness range of 15mm was applied to each of the knees. Knee flexion was found to decrease exponentially with increased patellar thickness in both the biomechanical and experimental studies. Importantly, this flexion loss followed an exponential pattern with higher patellar thicknesses in both studies. In order to avoid adverse biomechanical and functional consequences, it is recommended to restore patellar thickness to that of the native knee during total knee arthroplasty.

scholarly journals Effect of Patellar Thickness on Knee Flexion in Total Knee Arthroplasty: A Biomechanical and Experimental Study

2021 ◽  
Author(s):  
David Backstein ◽  
Mansour Abolghasemian ◽  
Saeid Samiezadeh ◽  
Amir Sternheim ◽  
Habiba Bougherara ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Knee Prosthesis ◽  
Experimental Studies ◽  
Biomechanical Model ◽  
Functional Consequences ◽  
Computer Based ◽  
Total Knee ◽  
Patellar Thickness

A biomechanical computer-based model was developed to simulate the influence of patellar thickness on passive knee flexion after arthroplasty. Using the computer model of a single-radius, PCL-sacrificing knee prosthesis, a range of patella-implant composite thicknesses was simulated. The biomechanical model was then replicated using two cadaveric knees. A patellar-thickness range of 15mm was applied to each of the knees. Knee flexion was found to decrease exponentially with increased patellar thickness in both the biomechanical and experimental studies. Importantly, this flexion loss followed an exponential pattern with higher patellar thicknesses in both studies. In order to avoid adverse biomechanical and functional consequences, it is recommended to restore patellar thickness to that of the native knee during total knee arthroplasty.

scholarly journals Effect of Patellar Thickness on Knee Flexion in Total Knee Arthroplasty: A Biomechanical and Experimental Study

2014 ◽  
Vol 29 (1) ◽  
pp. 80-84 ◽  
Author(s):  
Mansour Abolghasemian ◽  
Saeid Samiezadeh ◽  
Amir Sternheim ◽  
Habiba Bougherara ◽  
C. Lowry Barnes ◽  
...  
Keyword(s):  
Experimental Study ◽  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Total Knee ◽  
Patellar Thickness

scholarly journals Influence of Patella thickness on Patellofemoral pressure in total knee Arthroplasty

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Hidenori Tanikawa ◽  
Mitsunori Tada ◽  
Ryo Ogawa ◽  
Kengo Harato ◽  
Yasuo Niki ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Joint ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Patellofemoral Joint ◽  
Joint Function ◽  
Custom Made ◽  
Total Knee ◽  
Patellar Thickness ◽  
Patellofemoral Pressure

Abstract Background Patellofemoral complications are one of the major issues after total knee arthroplasty (TKA). Excessive patellofemoral joint pressure is associated with complications after TKA surgery, and the amount of patellar osteotomy has a direct effect on patellofemoral joint pressure. The purpose of this study was to evaluate the influence of patella thickness on patellofemoral pressure in TKA. Methods Five freshly frozen cadavers were operated with a custom-made Stryker posterior stabilizing type knee joint prosthesis. Patellofemoral joint pressure was measured using a pressure sensor, with the knee joint flexed from 90 to 110 degrees, and with patellar thickness of − 2 mm to + 4 mm. Results Increasing or decreasing patellar thickness significantly increased or decreased patellofemoral pressure. Regarding knee flexion angle, patellofemoral pressure increased with increasing patellar thickness at all flexion angles, but the pressure increase was greatest at 90 degrees of knee flexion and smallest at 110 degrees. Conclusions The amount of patellar osteotomy influences the patellofemoral pressure. Surgeons should avoid increasing patella thickness, since the resulting increased patellofemoral pressure may reduce knee joint function.

scholarly journals Influence of Patella Thickness on Patellofemoral Pressure in Total Knee Arthroplasty

2020 ◽  
Author(s):  
Hidenori Tanikawa ◽  
Mitsunori Tada ◽  
Ryo Ogawa ◽  
Kengo Harato ◽  
Yasuo Niki ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Joint ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Patellofemoral Joint ◽  
Joint Function ◽  
Custom Made ◽  
Total Knee ◽  
Patellar Thickness ◽  
Patellofemoral Pressure

Abstract Background: Patellofemoral complications are one of the major issues after total knee arthroplasty (TKA). Excessive patellofemoral joint pressure is associated with complications after TKA surgery, and the amount of patellar osteotomy has a direct effect on patellofemoral joint pressure. The purpose of this study was to evaluate the influence of patella thickness on patellofemoral pressure in TKA.Methods. Five freshly frozen cadavers were operated with a custom-made Stryker posterior stabilizing type knee joint prosthesis. Patellofemoral joint pressure was measured using a pressure sensor, with the knee joint flexed from 90 to 110 degrees, and with patellar thickness of -2mm to +4mm.Results: Increasing or decreasing patellar thickness significantly increased or decreased patellofemoral pressure. Regarding knee flexion angle, patellofemoral pressure increased with increasing patellar thickness at all flexion angles, but the pressure increase was greatest at 90 degrees of knee flexion and smallest at 110 degrees.Conclusions: The amount of patellar osteotomy influences the patellofemoral pressure. Surgeons should avoid increasing patella thickness, since the resulting increased patellofemoral pressure may reduce knee joint function.

Effect of Manipulation under Anesthesia of the First Knee in Staged Bilateral Total Knee Arthroplasty on Clinical Outcome and Satisfaction

2020 ◽  
Author(s):  
Jung-Won Lim ◽  
Yong-Beom Park ◽  
Dong-Hoon Lee ◽  
Han-Jun Lee
Keyword(s):  
Total Knee Arthroplasty ◽  
Patient Satisfaction ◽  
Clinical Outcome ◽  
Clinical Outcomes ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Functional Score ◽  
Manipulation Under Anesthesia ◽  
Total Knee

AbstractThis study aimed to evaluate whether manipulation under anesthesia (MUA) affect clinical outcome including range of motion (ROM) and patient satisfaction after total knee arthroplasty (TKA). It is hypothesized that MUA improves clinical outcomes and patient satisfaction after primary TKA. This retrospective study analyzed 97 patients who underwent staged bilateral primary TKA. MUA of knee flexion more than 120 degrees was performed a week after index surgery just before operation of the opposite site. The first knees with MUA were classified as the MUA group and the second knees without MUA as the control group. ROM, Knee Society Knee Score, Knee Society Functional Score, Western Ontario and McMaster Universities (WOMAC) score, and patient satisfaction were assessed. Postoperative flexion was significantly greater in the MUA group during 6 months follow-up (6 weeks: 111.6 vs. 99.8 degrees, p < 0.001; 3 months: 115.9 vs. 110.2 degrees, p = 0.001; 6 months: 120.2 vs. 117.0 degrees, p = 0.019). Clinical outcomes also showed similar results with knee flexion during 2 years follow-up. Patient satisfaction was significantly high in the MUA group during 12 months (3 months: 80.2 vs. 71.5, p < 0.001; 6 months: 85.8 vs. 79.8, p < 0.001; 12 months: 86.1 vs. 83.9, p < 0.001; 24 months: 86.6 vs. 85.5, p = 0.013). MUA yielded improvement of clinical outcomes including ROM, and patient satisfaction, especially in the early period after TKA. MUA in the first knee could be taken into account to obtain early recovery and to improve patient satisfaction in staged bilateral TKA.

Post-operative blood loss in total knee arthroplasty: knee flexion versus pharmacological techniques

2013 ◽  
Vol 22 (11) ◽  
pp. 2756-2762 ◽  
Author(s):  
Pierluigi Antinolfi ◽  
Bernardo Innocenti ◽  
Auro Caraffa ◽  
Giuseppe Peretti ◽  
Giuliano Cerulli
Keyword(s):  
Total Knee Arthroplasty ◽  
Blood Loss ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Operative Blood Loss ◽  
Total Knee

Modern femoral component design in total knee arthroplasty shows a lower patellar contact force during knee flexion compared with its predecessor

The Knee ◽  
2021 ◽  
Vol 30 ◽  
pp. 1-8
Author(s):  
Naoki Nakano ◽  
Yuichi Kuroda ◽  
Toshihisa Maeda ◽  
Koji Takayama ◽  
Shingo Hashimoto ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Femoral Component ◽  
Contact Force ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Component Design ◽  
Total Knee
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