The ribology of joints and problems of modern orthopedics

Pinchuk, L. S.; Chernyakova, Yu. M.; Goldade, V. A.

doi:10.3103/s1068366608030124

Cited by 15 publications

(16 citation statements)

References 16 publications

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“…In the long‐term implantation, the behavior of UHMWPE is compromised by its insufficient wear performance, low stiffness and high creep compliance. As chemical nature and physical–mechanical properties of UHMWPE are similar to bio‐tissues, it is widely used as a material for the manufacturing of implants …”

Section: Introductionmentioning

confidence: 99%

Nanomechanical and tribological behavior of hydroxyapatite reinforced ultrahigh molecular weight polyethylene nanocomposites for biomedical applications

Mirsalehi

Khavandi

Mirdamadi

et al. 2015

J of Applied Polymer Sci

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A hydroxyapatite (HA) particulate reinforced ultrahigh molecular weight polyethylene (UHMWPE) nanocomposite is fabricated by internal mixer at 180°C and using of paraffin oil as a processing aid to overcome the high viscosity of melted UHMWPE. The reinforcing effects of nano‐HA are investigated on nanomechanical properties of HA/UHMWPE nanocomposites by nanoindentation and nanoscratching methods. Results show that the nanocomposite with 50 wt % nano‐HA exhibits a Young's modulus and hardness of 362.5% and 200% higher, and a friction coefficient of 38.86% lower than that of pure UHMWPE, respectively. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42052.

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Section: Introductionmentioning

confidence: 99%

Nanomechanical and tribological behavior of hydroxyapatite reinforced ultrahigh molecular weight polyethylene nanocomposites for biomedical applications

Mirsalehi

Khavandi

Mirdamadi

et al. 2015

J of Applied Polymer Sci

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“…The problem is becoming of social and economic significance [1]. Eight out of ten people have back pains throughout their life times.…”

Section: Introductionmentioning

confidence: 99%

Tribological examination of lumbar intervertebral disc implants

et al. 2013

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The article presents results of friction and wear tests of three piece systems of the intervertebral disc implant. The number of work cycles proved to have an effect on the coefficient of friction for polyethyl ene on metal and metal on metal tribojoints. In addition, for polyethylene on metal tribojoints, the effect of compressive force on the coefficient of friction was specified. The influence of working cycles on roughness changes of implant's working surfaces was analyzed. Based on the microscopic examination of the working surface of implants and morphology of the wear products, the wear mechanism was described. Studies were performed at the Laboratory of Surface Engineering and Tribology in the Metal Forming Institute in Poznan using a SBT 03 simulator.

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“…It is known from previous history that to inhibit and cure osteoarthrosis it is necessary to fulfill certain necessary conditions; i.e., it is necessary to externally replenish the deficit of both sulfated mucopolysaccharides and HUA [29,62,63]. A wide spectrum of medicinal preparations (MP) have been developed for these aims; they are subdivided, correspondingly, into chondroprotectors and hyaluronates.…”

Section: Tribological Principles Of Developing Medicinalmentioning

confidence: 99%

“…The first two MP differ in their HUA content, which in MP2 (10 mg/ml) is almost two orders higher than in MP1 (not less than 0.13 mg/nl). These MP are widely used in various forms to cure arthropathy [29,62,63,66]. We determined the friction force in the studied load-bearing joint with a lubricating material judging by the time of oscillation attenuation of the pendulum, as well as from the dependences of the friction coefficient on time and concentration of the MP in BS.…”

Section: Tribological Principles Of Developing Medicinalmentioning

confidence: 99%

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Effect of Liquid Crystals on Biological Mechanisms of Reducing Joint Friction

Ermakov

Белецкий²,

Eismont³

et al. 2015

Liquid Crystals in Biotribology

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The results of studying the friction of joint cartilages lubricated by synovia and lubricants without and with additives of liquid crystal compounds are presented. Based on the experimental data, the structural-mechanical and antifriction properties of joint synovia are compared. It is shown that, having in mind the regular structure of surface layers and deformation behavior of cartilages, the present results confirm the assumption on liquid crystal compounds as a cause of low friction in joints. The best tribological characteristics for the combinations with blood serum are demonstrated by drugs based on chondroitin sulfate, which display characteristics close to natural synovial fluid during frictional interaction of cartilage.The liquid crystal state seems to be an ideal medium for the occurrence of many biochemical reactions and the provision of the reproduction of biological structures. It is characteristic of cell membranes and organelles, photoreceptors of retina, microfibrils, collagen albumens, myelin nerve fibers, nucleic acids, saliva, and other natural objects [1][2][3][4]. The joint synovia also belongs to these objects. Its mesomorphic state may play an important role in reducing joint friction. Effect of Friction Surfaces and Lubricant on Joint Cartilage FrictionProceeding from modern ideas on anatomical, physiological, and biochemical features of members of the human and animal locomotor system including mechanisms of joint lubrication it is important to study the boundary lubrication of cartilages which occurs under heavy loads because collagen fibers are brought together. According to the generally accepted concept, low friction under these conditions should result from the formation of adsorbed films on friction surfaces. The latter are effectively separated by the films acting like boundary films of fatty acids, i.e. surfactants whose molecules are elongated and produce polymolecular adsorbed films normal to the friction surfaces [5][6][7]. Such structures are known to be characteristic of smectic liquid crystals. Since synovia contains acid components [8] it can be assumed that low friction in the boundary lubrication of cartilages is due to the mechanism of the action of fatty acids, i.e. the substances capable of forming smectic liquid crystal structures on bearing surfaces.Results of these studies are of interest for the following reasons. The lubricating behavior of the systems containing fatty acids is known to be governed by features of the structure of lubricating films in the zone of dynamic contact between solids rather than the lubricant rheological behavior [9,10]. Fatty acids of the biological origin belong to smectic liquid crystals characterized by a low shear resistance because shear in friction is localized in adsorbed lubricant films [10][11][12][13][14][15]. The use of fatty acids as surfactants to reduce friction is most effective when the nature of the friction surfaces provides chemical reactions between them and the acids [10,16].The assumption that synovia dem...

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The ribology of joints and problems of modern orthopedics

Cited by 15 publications

References 16 publications

Nanomechanical and tribological behavior of hydroxyapatite reinforced ultrahigh molecular weight polyethylene nanocomposites for biomedical applications

Nanomechanical and tribological behavior of hydroxyapatite reinforced ultrahigh molecular weight polyethylene nanocomposites for biomedical applications

Tribological examination of lumbar intervertebral disc implants

Effect of Liquid Crystals on Biological Mechanisms of Reducing Joint Friction

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