Reducing fretting-initiated crevice corrosion in hip simulator tests using a zirconia-toughened alumina femoral head

2017 ◽  
Vol 106 (8) ◽  
pp. 2815-2826 ◽  
Author(s):  
Masayuki Kyomoto ◽  
Yuichi Shoyama ◽  
Kenichi Saiga ◽  
Toru Moro ◽  
Kazuhiko Ishihara
Keyword(s):  
Femoral Head ◽  
Crevice Corrosion ◽  
Hip Simulator ◽  
Zirconia Toughened Alumina

Hip simulator evaluation of the effect of femoral head size on sequentially cross-linked acetabular liners

Wear ◽  
2007 ◽  
Vol 263 (7-12) ◽  
pp. 1034-1037 ◽  
Author(s):  
Lizeth Herrera ◽  
Reginald Lee ◽  
Jason Longaray ◽  
Aaron Essner ◽  
Aiguo Wang
Keyword(s):  
Femoral Head ◽  
Head Size ◽  
Femoral Head Size ◽  
Hip Simulator

Alumina Femoral Head Fracture: An in Vitro Study

2000 ◽  
Vol 23 (4) ◽  
pp. 256-260 ◽  
Author(s):  
S. Affatato ◽  
E. Ghisolfi ◽  
G.L. Cacciari ◽  
A. Toni
Keyword(s):  
Stainless Steel ◽  
Femoral Head ◽  
In Vitro Study ◽  
Detailed Examination ◽  
Femoral Head Fracture ◽  
Acetabular Cup ◽  
Ceramic Ball ◽  
Ceramic Femoral Head ◽  
Hip Simulator

A fracture of a ceramic femoral head is reported in this study. Fractures of ceramic femoral heads are uncommon and reports on this complication are rare. After 3 million cycles, on a twelve station hip simulator that tested alumina femoral head against polyethylene acetabular cup, fracture of the ceramic ball was observed. The retrieved specimen consisted of three large ceramic fragments from the same ceramic femoral head, a polyethylene acetabular cup and a stainless steel jig. Careful and detailed examination of the removed components was made. The fracture of the ceramic ball resulted in damage to the metal taper of the jig component which was fixed into the simulator.

Heat Generation and Dissipation Behavior of Various Orthopaedic Bearing Materials

2006 ◽  
Vol 309-311 ◽  
pp. 1281-1284 ◽  
Author(s):  
Stanley Tsai ◽  
Abraham Salehi ◽  
Patrick Aldinger ◽  
Gordon Hunter
Keyword(s):  
Femoral Head ◽  
Peak Load ◽  
Tetragonal Zirconia ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Interface Surface ◽  
Hip Simulator ◽  
Significant Difference ◽  
Femoral Heads ◽  
Oxidized Zirconium ◽  
Bearing Materials

It has been shown that with high interfacial temperatures in hip bearings, it is possible to precipitate proteins, greatly reduce the compressive creep properties of ultrahigh molecular weight polyethylene (UHMWPE), and change the phase content of monolithic tetragonal zirconia. These induced features may alter the wear rate of UHMWPE. It was the objective of this study to examine the interfacial temperatures of oxidized zirconium (OxZr) heads as compared with metallic and ceramic heads coupled with polyethylene in a hip simulator. The interface temperatures were measured by placing thermocouples within 0.5 mm of the interface surface of both femoral heads and acetabular liners, and then articulating the surfaces using a 12-station AMTI anatomic hip simulator. The alumina femoral heads had the lowest average interfacial temperature, followed in increasing order by OxZr, CoCr, and zirconia. The ranking corresponds to the thermal conductivity of each material. A statistically significant difference (p<0.05) was found between all four materials for the femoral head temperature. No difference was seen in liner temperature between the alumina and OxZr groups, but statistical differences were found between all other combinations. Additionally, increasing head diameter, peak load, cyclic frequency, and serum concentration all resulted in statistically significant increases in both femoral head and liner temperatures.

Investigation of Aged Dispersion Ceramics by Means of Hip Simulator

2007 ◽  
Vol 361-363 ◽  
pp. 771-774 ◽  
Author(s):  
Thomas Oberbach ◽  
Sabine Begand ◽  
Wilfried Glien ◽  
Christian Kaddick
Keyword(s):  
Life Expectancy ◽  
Ceramic Materials ◽  
Alumina Ceramic ◽  
Zirconia Ceramic ◽  
Tribological Behaviour ◽  
Artificial Joints ◽  
Hip Simulator ◽  
Zirconia Toughened Alumina ◽  
Ceramic On Ceramic

Wear of hip implants is a significant problem for the life expectancy of artificial joints. By using alumina ceramic on ceramic couplings the wear can be decreased. But for further improvement of the safety of THR the aim is the development of new ceramic materials. For orthopaedic applications an Alumina Toughened Zirconia Ceramic ATZ (80% ZrO2-20%Al2O3) and a Zirconia Toughened Alumina ZTA (25% ZrO2-75%Al2O3) were tested regarding their tribological behaviour by means of hip simulator testing after hydrothermal treatment. The absolute wear amount for the aged samples after 5 million cycles is slightly increased on a very low level, but even less wear than for common alumina pairings. In consideration of these excellent results both dispersion ceramics are highly suitable for long term applications.

scholarly journals Study of Sensor Deflection in Hip Simulator : Numerical and Experimental Method

2018 ◽  
Vol 73 ◽  
pp. 01022
Author(s):  
Fabian Singgih Wicaksono ◽  
T Towijaya ◽  
Eko Saputra ◽  
Rifky Ismail ◽  
Mohammad Tauviqirrahman ◽  
...  
Keyword(s):  
Femoral Head ◽  
Hip Joint ◽  
Estimation Error ◽  
Wear Volume ◽  
Acetabular Cup ◽  
Hip Simulator ◽  
Artificial Hip ◽  
Process Simulator ◽  
Dial Indicator ◽  
Hip Joint Simulator

A lot of Hip Joint Simulator have been made nowadays, most of them use different structure and method. This research reports a pin-on-ring tribometer design that is used to became hip joint simulator based on the movement of the salat (salat gait). Modified femoral head and acetabular cup holder are performed, to design a reciprocating motion for simulation of artificial hip movement. An interesting finding from this study is a new linked-bar mechanism that leads to the ability to move femoral head against the acetabular cup and measure wear volume of an THR patients during normal salat gait. The designed motion angle is 121.5° in the flexion direction and 15.5° in the direction of abduction. Linked bar for sensor dial indicator have enough adjustment, but there is still a movement that is not rigid upon running hip joint process simulator. This research concentrates on the bar is already linked in accordance or not when compared with the data in the simulate on a computer. Estimation error and deviations that occur between numerical and experimental is going forward to improve hip joint simulator Undip to be more precise and relevant research to use THR Undip.

The Function of Bipolar Hip Prostheses—A Laboratory Study Using Cadaveric Acetabula

1992 ◽  
Vol 206 (1) ◽  
pp. 37-42 ◽  
Author(s):  
R G Wetherell ◽  
A Unsworth ◽  
A A Amis
Keyword(s):  
Femoral Head ◽  
Laboratory Study ◽  
Hip Prosthesis ◽  
Weight Bearing ◽  
The Self ◽  
Head Size ◽  
Separate Study ◽  
Hip Prostheses ◽  
Hip Simulator

Cadaveric acetabula were mounted in a hip simulator and the friction developed in each during articulation with a series of metal femoral head prostheses of differing sizes was measured. In a separate study, assembled Hastings bipolar hip prostheses were subjected to weight-bearing forces in the same acetabula and their self-righting mechanism was observed. The self-righting mechanism was found to function efficiently, in most cases overcoming the combined friction of the inner and outer articulations of the Hastings hip. However, during motion in the hip simulator a wide variation of friction was observed between different acetabula and within the same acetabulum with differing head size. In several cases this acetabular friction was found to be less than the friction in the inner articulation of the Hastings bipolar hip prosthesis, and this may explain some cases of reported failure of biarticular function.

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

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