THE INFLUENCE OF SURFACE ROUGHNESS AND CEMENTING TECHNIQUE ON THE MICROSTRUCTURE AND MECHANICAL STRENGTH AT THE CEMENT-PROSTHESIS INTERFACE

2010 ◽  
Vol 22 (05) ◽  
pp. 419-426
Author(s):  
Ching-Lung Tai ◽  
De-Mei Lee ◽  
Pang-Hsing Hsieh
Keyword(s):  
Surface Roughness ◽  
Shear Strength ◽  
Rough Surface ◽  
Microscopic Observation ◽  
Bonding Strength ◽  
Femoral Stem ◽  
Cementing Technique ◽  
Cement Interface ◽  
Cement Prosthesis

It was generally considered that a femoral stem with a rough surface was not suitable for cemented fixation in total hip arthroplasty. The long-term follow-up studies on the cemented rough stems clearly revealed a significantly higher loosening and revision rate than those of polished stems. However, from a biomechanics point of view, a rough surface might result in stronger cement-prosthesis bonding because of micro-interlocking between the bone cement and the stem. This contradiction between biomechanical standpoint and clinical observation remains as a problem to be resolved. Thus, this study was designed to evaluate the effect of stem surface roughness and the cement pre-coating process on the bonding strength of the prosthesis-cement interface. A total of 48 Co-Cr rods with three different levels of surface roughness (polished, plasma-treated and bead-coated, 16 in each group) were enrolled in the study. All specimens were cylindrical in shape with lengths of 120 mm and 12 mm diameters. Sixteen specimens in each group were then treated with non-precoated or precoated cement fixation (8 in each group). After fixing the Co-Cr rod, the pushout test was carried out using a MTS testing machine, and the shear strength for each group was compared. An additional microscopic observation of the metal/cement interface was also performed. The results of the pushout test indicated that the shear strength increased with increasing implant surface roughness, regardless of whether or not the stem was treated with the cement precoating process. However, stem precoating did not statistically improve the bonding strength at each level of surface roughness. Microscopic observation of the stem-cement interfaces revealed that the bone cement significantly infiltrated the rough surface in both the precoated and non-precoated groups with stems with various levels of surface roughness. Surface roughness of the femoral stem significantly affected the stem/cement interface, improving shear strength significantly. Stem precoating did not statistically improve the shear strength using the present cementing technique with retrograde high-pressure injection. Although a high surface roughness of the femoral stem appears to be an effective choice to improve implant fixation in cemented THA, the longevity of the prostheses implanted with such a stem can only be determined from long-term clinical trials.

scholarly journals Cement-Implant Interface Contamination: Possible Reason of Inferior Clinical Outcomes for Rough Surface Cemented Stems

2013 ◽  
Vol 7 (1) ◽  
pp. 250-257 ◽  
Author(s):  
Tian Wang ◽  
Matthew H Pelletier ◽  
Nicky Bertollo ◽  
Alan Crosky ◽  
William R Walsh
Keyword(s):  
Bone Marrow ◽  
Surface Roughness ◽  
Clinical Outcomes ◽  
Rough Surface ◽  
Bonding Strength ◽  
Interfacial Bonding Strength ◽  
Before And After ◽  
The Stability ◽  
Cemented Implants ◽  
Push Out

Background: Shape-closed cemented implants rely on a stronger bond and have displayed inferior clinical outcomes when compared to force-closed designs. Implant contamination such as saline, bone marrow and blood prior to cement application has the potential to affect the cement-implant bond. The consequences of implant contamination were investigated in this study. Methods: Fifty Titanium alloy (Ti-6Al-4V) dowels were separated into ten groups based on surface roughness and contaminant, and then cemented in polyvinyl chloride tubes. Push-out testing was performed at 1mm per minute. The roughness of the dowel surface was measured before and after the testing. The dowel surface and cement mantel were analyzed using a Scanning Electron Microscopy (SEM) to determine the distribution and characteristics of any debris and contaminants on the surface. Results: Contaminants largely decreased stem-cement interfacial shear strength, especially for rough surfaces. Saline produced the greatest decrease, followed by blood. The effect of bone marrow was less pronounced and similar to that of oil. Increasing surface roughness increased the interfacial bonding strength, even with contaminants. There was a non-significant increase in mean bonding strength for smooth surfaces with bone marrow and oil contamination. SEM showed that contaminants influence the interfacial bond by different mechanisms. More debris was found on rough samples following testing. Conclusions: The results of this study underscore the importance of keeping an implant free from contamination, and suggest if contamination does occur, a saline rinse may further decrease the stability of an implant. The deleterious effects of contamination on rough surface cement bonding were considerable, and indicate that contamination at the time of surgery may, in part, contribute to inferior clinical outcomes for rough surfaced cemented stems.

Long-Term Survival of a Flat-on-Flat Total Condylar Knee Arthroplasty Fixed with a Hybrid Cementing Technique for Tibial Components

2012 ◽  
Vol 22 (4) ◽  
pp. 305-312 ◽  
Author(s):  
Christian Carulli ◽  
Fabrizio Matassi ◽  
Lorenzo Nistri ◽  
Roberto Civinini ◽  
Massimo Innocenti
Keyword(s):  
Knee Arthroplasty ◽  
Cementing Technique ◽  
Term Survival ◽  
Long Term Survival

Impact of medical titanium implant surface on the efficiency of fibrointegration

2020 ◽  
pp. 50-55
Author(s):  
T. R. Davydova ◽  
А. I. Shaikhaliev ◽  
D. A. Usatov ◽  
G. A. Gasanov ◽  
R. S. Korgoloev
Keyword(s):  
Surface Roughness ◽  
Titanium Dioxide ◽  
Rough Surface ◽  
Soft Tissues ◽  
Titanium Implant ◽  
Implant Surface ◽  
Anatase Structure ◽  
Bioactive Coating ◽  
Cell Structures ◽  
Titanium Alloy Ti6al4v

The aim of this study was to study the effect of surface branching of titanium endoprostheses on the efficiency of fibrointegration. The object of the study was samples of titanium alloy Ti6Al4V in the form of disks with a diameter of 5 mm and a thickness of 1 mm with various surface treatments: 1) samples with a rough surface after sandblasting; 2) samples with a rough surface after sandblasting with a bioactive coating of titanium dioxide TiO2 with anatase structure. The study of surface roughness was carried out by profilometry. Evaluation of the spreading and proliferation of cells on the surface of test samples, as well as evaluation of the effectiveness of fibrointegration was carried out according to standard methods using scanning electron microscopy. During the experiments, mesinchymal stem cells were sown on test samples and the test samples were introduced into the soft tissues of experimental animals. Based on the results obtained, it was concluded that the technology of forming rough surfaces by sandblasting does not provide high uniformity and reproducibility in the nanometer range and, apparently, another method for obtaining a rough surface should be chosen. The application of a bioactive coating of titanium dioxide TiO2 with the anatase structure to the surface of titanium endoprostheses increases the efficiency of fibrointegration, however, primarily the fibrointegration of titanium endoprostheses depends on their surface roughness, which determines the concentration of cell structures, the intensity of their adhesion and the ability to fibrointegrative process.

scholarly journals Effects of Roughness on Stresses in an Oxide Scale Formed on a Superalloy Substrate

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 479
Author(s):  
Yang Zhao ◽  
Fan Sun ◽  
Peng Jiang ◽  
Yongle Sun
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Residual Stresses ◽  
Oxide Scale ◽  
Rough Surface ◽  
Alumina Scale ◽  
Growth Stress ◽  
Oxide Growth ◽  
Substrate Thickness ◽  
Roughness Effect

The effects of surface roughness on the stresses in an alumina scale formed on a Fecralloy substrate are investigated. Spherical indenters were used to create indents with different radii and depths to represent surface roughness and then the roughness effect was studied comprehensively. It was found that the residual stresses in the alumina scale formed around the rough surface are almost constant and they are dominated by the curvature rather than the depth of the roughness. Oxidation changes the surface roughness. The edge of the indent was sharpened after oxidation and the residual stress there was released presumably due to cracking. The residual stresses in the alumina scale decrease with increase in oxidation time, while the substrate thickness has little effect, given that the substrate is thicker than the alumina scale. Furthermore, the effect of roughness on the oxide growth stress is analysed. This work indicates that the surface roughness should be considered for evaluation of stresses in coatings.

Influence of revision arthroplasty on bone/cement interface shear strength

1987 ◽  
Vol 20 (8) ◽  
pp. 824
Author(s):  
J.E. Bechtold ◽  
Y. Dohmae ◽  
R.E. Sherman ◽  
R.B. Gustilo
Keyword(s):  
Shear Strength ◽  
Bone Cement ◽  
Revision Arthroplasty ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Cement Interface

scholarly journals Skewness and Kurtosis: Important Parameters in the Characterization of Dental Implant Surface Roughness—A Computer Simulation

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Karl Niklas Hansson ◽  
Stig Hansson
Keyword(s):  
Surface Roughness ◽  
Shear Strength ◽  
Roughness Parameter ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Implant Surface ◽  
Bone Response ◽  
Dental Implant Surface ◽  
Skewness And Kurtosis

The surface roughness affects the bone response to dental implants. A primary aim of the roughness is to increase the bone-implant interface shear strength. Surface roughness is generally characterized by means of surface roughness parameters. It was demonstrated that the normally used parameters cannot discriminate between surfaces expected to give a high interface shear strength from surfaces expected to give a low interface shear strength. It was further demonstrated that the skewness parameter can do this discrimination. A problem with this parameter is that it is sensitive to isolated peaks and valleys. Another roughness parameter which on theoretical grounds can be supposed to give valuable information on the quality of a rough surface is kurtosis. This parameter is also sensitive to isolated peaks and valleys. An implant surface was assumed to have a fairly well-defined and homogenous “semiperiodic” surface roughness upon which isolated peaks were superimposed. In a computerized simulation, it was demonstrated that by using small sampling lengths during measurement, it should be possible to get accurate values of the skewness and kurtosis parameters.

Effect of Rolling Velocity and Maximum Hertzian Pressure on Fluid Film in Steady State EHL Line Contact with Rough Surface and Linear Piezoviscosity

2014 ◽  
Vol 592-594 ◽  
pp. 1371-1375
Author(s):  
Nitesh Talekar ◽  
Punit Kumar
Keyword(s):  
Surface Roughness ◽  
Steady State ◽  
Film Thickness ◽  
Rough Surface ◽  
Computer Code ◽  
Fluid Film ◽  
Line Contact ◽  
Rolling Velocity ◽  
Load Carrying ◽  
Lubricated Contact

Consideration of surface roughness in steady state EHL line contact is the first step towards understanding the lubrication of rough surface problem. Current paper investigates the use of sinusoidal waviness in the contact; more precisely it gives performance of real fluid in EHL line contact. The effect of various parameters like rolling velocity (U) and maximum Hertzian pressure (ph) on surface roughness by using properties of linear and exponential piezo-viscosity is taken into consideration to evaluate behavior of pressure distribution of load carrying fluid film and film thickness. Full isothermal, Newtonian simulation of EHL problem gives described effects. Spiking or fluctuation of pressure and film thickness curves is expected to show presence of irregularities on the surface chosen and amount of fluctuation depends on certain parameters and intensity of irregularities present. Rolling side domain of-4.5 ≤ X ≤ 1.5 with grid size ∆X=0.01375 is selected. A computer code is developed to solve Reynolds equation, which governs the generation of pressure in the lubricated contact zone is discritized and solved along with load balance equation using Newton-Raphson technique.

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