A novel tribological study on DLC-coated micro-dimpled orthopedics implant interface

et al. 2019

Lubrication Science

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This study provides a systematic review of the synovial and simulated body fluid research for the last 10 years (2006 to 2016). In particular, biochemical and mechanical properties of synovial fluid after joint replacement are focused, namely, the chemical composition of the formed lubricating film and structural changes of the associated proteins under mechanical loading. In summary, the formation of the film depends on pH, viscosity, and concentration of the solution, static, sliding, and rolling conditions and other factors related to the joint replacement. However, chemical changes of the synovial fluid proteins after the joint replacement are rarely addressed and require further attention. To this end, we provide a preliminary study of selected proteins within the synovial fluid using Raman spectroscopy. We conclude that chemical analysis together with the analysis of mechanical and biological properties of the synovial fluid after total joint replacement will help in comprehension of the process.

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A systematic review on correlation between biochemical and mechanical processes of lubricant film formation in joint replacement of the last 10 years

Rufaqua

Vrbka

et al. 2019

Lubrication Science

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“…A pin-on-disk experiment was conducted for friction testing because it is able to provide friction coefficient data with per second resolution. It is worth noting that whilst modern hip simulators are able to vary operating parameters (including dynamic loading, multidirectional sliding directions, and controlled temperature), along with offering a long run capacity, very few of them provide in-run friction coefficient data [21]. Thus, we have used a pin-on-disk tribometer in order to replicate the hip joint in terms of contact pressure, speed, and realistic components of synovial fluid as lubricants.…”

Section: Methodsmentioning

confidence: 99%

Tribological performance of the biological components of synovial fluid in artificial joint implants

Ghosh

Science and Technology of Advanced Materials

Roy

et al. 2015

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The concentration of biological components of synovial fluid (such as albumin, globulin, hyaluronic acid, and lubricin) varies between healthy persons and osteoarthritis (OA) patients. The aim of the present study is to compare the effects of such variation on tribological performance in a simulated hip joint model. The study was carried out experimentally by utilizing a pin-on-disk simulator on ceramic-on-ceramic (CoC) and ceramic-on-polyethylene (CoP) hip joint implants. The experimental results show that both friction and wear of artificial joints fluctuate with the concentration level of biological components. Moreover, the performance also varies between material combinations. Wear debris sizes and shapes produced by ceramic and polyethylene were diverse. We conclude that the biological components of synovial fluid and their concentrations should be considered in order to select an artificial hip joint to best suit that patient.

“…However, elderly people are more likely to suffer from osteoarthritis (OA); subsequently, the high demand for joint replacement has become yet higher [2]. Although hip replacement is considered one of the most successful orthopedic surgical procedures, satisfaction has not been achieved yet, especially as recent statistics showed that the failure rate of hip joints is around 15% within 15 years of their implantation [3]. Therefore, a number of studies have been carried out based on different materials and designs to increase the durability of implants by decreasing friction, wear, and corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…Amanov and Sasaki [8] revealed a significant reduction of friction and wear rate by utilizing a combination of DLC-coated micro-dimple on a Ti–6Al–4V substrate under oil-lubricated sliding conditions. Very recently, Choudhury et al [3] revealed that DLC-coated micro-dimples have dual benefits: The dimples provide a thicker film thickness, and DLC enhances boundary lubrication. However, in that study, only bovine serum (BS) was used, and the conditions of post-experimental DLC were not comprehensively studied.…”

Section: Introductionmentioning

confidence: 99%

Tribological investigation of diamond-like carbon coated micro-dimpled surface under bovine serum and osteoarthritis oriented synovial fluid

Ghosh

Science and Technology of Advanced Materials

Roy

et al. 2015

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Osteoarthritis-oriented synovial fluid (OASF), i.e., that typical of a patient with osteoarthritis, has different physical and biological characteristics than bovine serum (BS), a lubricant widely used in biotribological investigations. Micro-dimpled and diamond-like carbon- (DLC) coated surfaces are key emerging interfaces for orthopedic implants. In this study, tribological performances of dimpled surfaces, with and without DLC coating, have been investigated under both BS and OASF. The friction tests were performed utilizing a pin on a disk tribometer, whereas contact pressure, speed, and temperature were simulated to a ‘medium walking gait’ of hip joint conditions. The mechanical properties of the specimen and the physical properties of the lubricant were characterized before the friction test. Raman analysis was conducted to identify the coating condition both before and after the test. The DLC-coated dimpled surface showed maximum hardness and residual stress. A DLC-coated dimpled surface under an OASF lubricated condition yielded a lower friction coefficient and wear compared to those of plain and dimpled specimens. The higher graphitization of coated materials with increasing load was confirmed by Raman spectroscopy.