Results 241 to 250 of about 162,043 (292)

Alumina-Alumina and Alumina-Polyethylene Total Hip Prostheses

2004
By the late 1960s, the Charnley hip implant system with a metallic femoral stem and an ultrahigh molecular weight polyethylene (UHMWPE) acetabular component was the primary design for successful total hip arthroplasty (THA). Many of today’s concerns regarding the Charnley system were recognized as early as 1970.
Julie A. Miller, James D. Talton, Sameer Bhatia   +2 more
openaire   +1 more source

Engineering aspect of alumina on alumina hip prosthesis

Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 2007
Alumina on the alumina sliding system in a total hip replacement is recognized as a breakthrough in orthopaedic surgery. Advantages and problems with this material are explained and discussed in the light of 36 years of clinical application. Laboratory data as well as clinical ones are summarized.
L, Sedel, A, Raould
openaire   +2 more sources

Alumina-on-alumina hip implants

The Journal of Bone and Joint Surgery. British volume, 2012
Alumina–alumina bearings are among the most resistant to wear in total hip replacement. Examination of their surfaces is one way of comparing damage caused by wear of hip joints simulated in vitro to that seen in explanted bearings. The aim of this study was to determine whether second-generation ceramic bearings exhibited a better pattern of wear than
Affatato, S, Traina, F, De Fine, M, Carmignato, S, Toni, A   +4 more
openaire   +3 more sources

ALUMINA-ON-ALUMINA TOTAL HIP ARTHROPLASTY

The Journal of Bone and Joint Surgery-American Volume, 2005
Ceramic-on-ceramic couplings are attractive alternative bearing surfaces that have been reported to eliminate or reduce problems related to polyethylene wear debris. Disappointing experiences with alumina ceramic bearings in the past have led to many improvements in the manufacture and design of ceramic implants. The purpose of the present study was to
Jeong Joon, Yoo, Young-Min, Kim, Kang Sup, Yoon, Kyung-Hoi, Koo, Won Seok, Song, Hee Joong, Kim   +5 more
openaire   +2 more sources

Hydrogen sulfide adsorption on alumina, modified alumina, and molybdenum trioxide/alumina

The Journal of Physical Chemistry, 1986
A systematic investigation of H/sub 2/S adsorption on Al/sub 2/O/sub 3/, modified Al/sub 2/O/sub 3/, and MoO/sub 3//Al/sub 2/O/sub 3/ catalysts was carried out by using temperature-programmed desorption techniques, coupled with IR and XPS. SiO/sub 2/-Al/sub 2/O/sub 3/ and AlPO/sub 4/ were also studied for comparison. It was found that Al/sub 2/O/sub 3/
Yasuaki Okamoto, Minoru Ohhara, Akinori Maezawa, Toshinobu Imanaka, Shiichiro Teranishi   +4 more
openaire   +1 more source

Joining of alumina with a porous alumina interlayer

Ceramics International, 2012
Abstract In the joining of structural ceramics, a porous interlayer is generally believed to deteriorate the mechanical properties of the joint. This paper, however, shows that a porous interlayer can sustain high adhesion strength when cavities or interfacial cracks are eliminated.
Hiroyuki Miyazaki, Mikinori Hotta, Hideki Kita, Yasuhisa Izutsu   +3 more
openaire   +1 more source

A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4+H2SO4 mixed solution

Hydrometallurgy, 2016
Alumina was leached from high-alumina coal fly ash with a NH4HSO4 + H2SO4 mixed solution. The leaching behavior was systematically investigated, as were factors such as mixed solution composition and concentration, reaction time and temperature, and ...
Dehua Xu, Huiquan Li, Chenye Wang
exaly   +2 more sources

Microseparation and Stripe Wear in Alumina-On-Alumina Hip Implants

The International Journal of Artificial Organs, 2011
The combination of materials that still has highest wear resistance for total hip replacement is ceramic-on-ceramic. However, brittleness is a major concern for ceramics: in vivo and in vitro studies on ceramic hip prostheses correlate microseparation with hip noise, ceramic wear, or ceramic liner damage.
Affatato, Saverio, Traina, Francesco, Toni, Aldo   +2 more
openaire   +3 more sources

Alumina: Filtration in the alumina production process

Filtration & Separation, 2010
The production of alumina from bauxite is a vital first step in the production of aluminium. Filtration and separation equipment plays a significant role in this process, in particularly challenging conditions. Trevor Sparks explains.
openaire   +1 more source

Performance of alumina-alumina and alumina-metal joints

1997
Siren, Mika, Kauppinen, Pentti, Auerkari, Pertti, Heikinheimo, Liisa   +4 more
openaire   +3 more sources