Effect of long-term natural aging on the thermal, mechanical, and viscoelastic behavior of biomedical grade of ultra high molecular weight polyethylene

2010 ◽  
Vol 118 (1) ◽  
pp. 17-24 ◽  
Author(s):  
H. Fouad
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Viscoelastic Behavior ◽  
Natural Aging ◽  
Ultra High Molecular Weight

Influence of Zeta Potential on the Lubrication Between Ultra-High Molecular Weight Polyethylene and CoCrMo Alloy

2000 ◽  
Author(s):  
Toshio Kitano
Keyword(s):  
Molecular Weight ◽  
Zeta Potential ◽  
High Molecular Weight ◽  
Friction And Wear ◽  
Long Term Results ◽  
Cocrmo Alloy ◽  
Total Replacement ◽  
Lubrication Condition ◽  
Ultra High Molecular Weight

Abstract Zeta potential is the potential that is related to the electric charge of the surface. Zeta potential influences tribological surface phenomenons. In the field of Orthopaedic surgery, osteolysis due to wear debris is one of the most difficult complications following total joint arthroplasty. Improvement of long term results and decrease of the revision rate demand that the lubrication mechanism of total replacement joint be revealed and friction and wear of surface be reduced. The purpose of this study is to clarify the correlation between zeta potential of ultra-high molecular weight polyethylene (UHMWPE) and friction in total replacement joint under boundary lubrication condition and to answer the effect of glycoprotein on total replacement joint.

Polycaprolactone/ultra-high molecular weight polyethylene partially absorbable suture with improved mechanical performances for tendon and ligament repair

2020 ◽  
Vol 90 (19-20) ◽  
pp. 2123-2135 ◽  
Author(s):  
Qian Zhang ◽  
Chaojing Li ◽  
Jiayan Luan ◽  
Guoping Guan ◽  
Jing Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Ligament Injury ◽  
Absorbable Suture ◽  
Suture Materials ◽  
Absorbable Sutures ◽  
Knot Security ◽  
Ultra High Molecular Weight

Orthopedic suture, as an implantable surgical device for skeletal and soft tissue connection, is vital in tendon or ligament injury repair. Resorbable therapy approaches exhibit excellent biocompatibility in the field of suture materials but lack a long-term fixation effect in orthopedic treatment. Herein, this study focused on a series of partially absorbable orthopedic sutures, which were composed of absorbable polycaprolactone (PCL) multifilament and non-absorbable ultra-high molecular weight polyethylene (UHMWPE) multifilament. Comprehensive in vitro mechanical evaluations were conducted to probe the relationship between material composition and mechanical properties of the sutures. The results showed that the partially absorbable sutures, especially P/U = 50/50 and P/U = 25/75, exhibited significant improvements in mechanical properties compared to single-material sutures. The tensile strength of P/U = 50/50 and P/U = 25/75 was 180.99 and 210.91 N, respectively, which was about two times higher than that of absorbable PCL suture P/U = 100/0 (62.42 N). Furthermore, their suture-to-suture friction force was 1.89 times and 2.51 times that of non-absorbable UHMWPE suture P/U = 0/100, respectively, which guaranteed good knot security. Compared with the clinically used orthopedic suture Ethibond (110 N), P/U = 50/50 and P/U = 25/75 also presented superior tensile properties. Notably, P/U = 50/50 and P/U = 25/75 had similar tensile curves to that of the native tendon/ligament, which might be beneficial to tissue healing. Moreover, the R2 of Eyring's model to simulate the creep curves of each suture was higher than 0.99, which indicated that Eyring's model could be used in predicting the long-term creep behavior of the sutures.

Antibacterial activity, cell toxicity, and mechanical property of ultra-high molecular weight polyethylene/chlorhexidine acetate–montmorillonite nanocomposite

2018 ◽  
Vol 33 (6) ◽  
pp. 647-659
Author(s):  
Jun Zhang ◽  
Fuling Feng ◽  
Bing Han ◽  
Dawei Wang ◽  
Lei Fu ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Molecular Weight ◽  
Antibacterial Activity ◽  
High Molecular Weight ◽  
Bacterial Adhesion ◽  
Interlayer Space ◽  
Cell Toxicity ◽  
Short Term ◽  
Ultra High Molecular Weight

Nanocomposites have been extensively used in many fields. Their properties can be improved or enhanced by the components in the nanocomposites. In this study, we reported the antibacterial activity, cell toxicity, and mechanical property of a three-component nanocomposite which consisted of ultra-high molecular weight polyethylene (UHMWPE), chlorhexidine acetate (CA), and montmorillonite (MMT). This nanocomposite (UHMWPE/CA-MMT) maintained good short-term resistance to bacterial adhesion, and its long-term resistance to bacterial adhesion was significantly improved as the interlayer space in montmorillonite prevented effectively the agglomeration and precipitation of chlorhexidine acetate after the intercalation of chlorhexidine acetate into montmorillonite. Also, its cell toxicity was reduced as the interlayer space in montmorillonite inhibited the release rate of chlorhexidine acetate. In addition, the mechanical property of UHMWPE/CA-MMT was improved because of the synergistic optimization of these three components. These findings suggested that this three-component nanocomposite UHMWPE/CA-MMT may be a promising biomaterial.

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