Relation of the structural-mechanical and antifriction properties of the synovial medium of the joints

Kupchinov, B. I.; Ermakov, S. F.; Rodnenkov, V. G.

doi:10.1007/bf00608151

Cited by 4 publications

(14 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To determine these regularities we compared the friction of the cartilage against glass in synovia, pseudo-synovia with and without the additive of liquid crystal cholesterol compounds, and organosilicon fluid ПMC-300 used to lubricate joints [23]. The tribotests involved the stepwise loading of the cartilage from 0.2 to 6.0 MPa followed by quick unloading down to 0.2 MPa [46].…”

Section: P Mpamentioning

confidence: 99%

“…5.14) [23,39]. A humeral joint is the most convenient test object for the pendulum tribometer from the anatomical viewpoint.…”

Section: Interrelation Between Structure-mechanical and Antifriction mentioning

confidence: 99%

“…The initial amplitude was the same for all experiments. The attenuation time and its standard error were found for each lubricant [23].…”

Section: Interrelation Between Structure-mechanical and Antifriction mentioning

confidence: 99%

“…5.4c, d) and when adding rapic acid spherical particles have been found (Fig. 5.4a-f).The observed wear of the cartilages in friction is apparently induced by the adsorption-fatigue damage of their surface layers typical for elastic materials [19,23]. Different shapes of wear particles are explained by different effects of rapic acid and water on the cartilage surfaces.…”

mentioning

confidence: 93%

“…5.4a, b). According to the data reported in [8,22,23] the thickness of the cartilage surface layer showing marked anisotropy is 200-600 μm. Therefore, anisotropy disappearance confirms certainly the catastrophic wear of cartilages in this case.…”

mentioning

confidence: 97%

See 4 more Smart Citations

Effect of Liquid Crystals on Biological Mechanisms of Reducing Joint Friction

Ermakov

Белецкий²,

Eismont³

et al. 2015

Liquid Crystals in Biotribology

View full text Add to dashboard Cite

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...

show abstract

Section: P Mpamentioning

confidence: 99%

“…5.14) [23,39]. A humeral joint is the most convenient test object for the pendulum tribometer from the anatomical viewpoint.…”

Section: Interrelation Between Structure-mechanical and Antifriction mentioning

confidence: 99%

“…The initial amplitude was the same for all experiments. The attenuation time and its standard error were found for each lubricant [23].…”

Section: Interrelation Between Structure-mechanical and Antifriction mentioning

confidence: 99%

mentioning

confidence: 93%

mentioning

confidence: 97%

See 3 more Smart Citations

Effect of Liquid Crystals on Biological Mechanisms of Reducing Joint Friction

Ermakov

Белецкий²,

Eismont³

et al. 2015

Liquid Crystals in Biotribology

View full text Add to dashboard Cite

show abstract

Tribology and Lubrication of Solids

Ermakov

Мышкин

2018

Liquid-Crystal Nanomaterials

View full text Add to dashboard Cite

Properties of Cartilage on Micro- and Nanolevel

Чижик

Wierzcholski

Trushko

et al. 2010

Advances in Tribology

View full text Add to dashboard Cite

Results of investigation of the elastic modulus for cartilage tissue using a technique of micro- and nanoindentation performed with help of an atomic force microscope are presented. SEM and AFM methods were applied to visualize a topography of surface layers of the entire cartilage and as well as its slices and thus to reveal features of the collagen fibers orientation. The technique used for a quantitative evaluation of the elastic modulus under compression against a ball microindenter (curvature radius - 350 micron) and a nanoindenter (30 nm) is described. It was shown that the cartilage behavior is highly stabile under the load if the entire composite structure of cartilage tissue is engaged into the deformation process. Tribological characteristics were investigated using the ball indenter oscillated by a tuning fork. Dependence of the friction coefficient from applied loads was obtained that revealed strong influence of an interstitial fluid on friction properties. Friction coefficient of a rat cartilage tissue as 0.08 was obtained using a developed plant prototype for tribological measurements based on the AFM construction.

show abstract

Relation of the structural-mechanical and antifriction properties of the synovial medium of the joints

Cited by 4 publications

References 11 publications

Effect of Liquid Crystals on Biological Mechanisms of Reducing Joint Friction

Effect of Liquid Crystals on Biological Mechanisms of Reducing Joint Friction

Tribology and Lubrication of Solids

Properties of Cartilage on Micro- and Nanolevel

Contact Info

Product

Resources

About