Ceramic insert fracture in cementless THR with modular neck, ceramic on ceramic.

2016 ◽  
Author(s):  
Favio Peirano
Keyword(s):  
Modular Neck ◽  
Ceramic Insert ◽  
Ceramic On Ceramic

Analysis of contact mechanics in ceramic-on-ceramic hip joint replacements

2002 ◽  
Vol 216 (4) ◽  
pp. 231-236 ◽  
Author(s):  
M M Mak ◽  
Z M Jin
Keyword(s):  
Femoral Head ◽  
Contact Mechanics ◽  
Contact Pressure ◽  
Contact Area ◽  
Design Parameters ◽  
Radial Clearance ◽  
Hip Implants ◽  
Acetabular Cup ◽  
Ceramic Insert ◽  
Ceramic On Ceramic

The contact mechanics in ceramic-on-ceramic hip implants has been analysed in this study using the finite element method. Only the ideal conditions where the contact occurs within the acetabular cup were considered. It has been shown that the contact pressure distribution and the contact area at the main articulating bearing surfaces depend largely on design parameters such as the radial clearance between the femoral head and the acetabular cup, as well as the thickness of the ceramic insert. For the ceramic-on-ceramic hip implants used in clinics today, with a minimum 5-mm-thick ceramic insert, it has been shown that the radius of the contact area between the femoral head and the acetabular cup is relatively small compared with that of the femoral head and the ceramic insert thickness. Consequently, Hertz contact theory can be used to estimate the contact parameters such as the maximum contact pressure and the contact area.

Metal Ion Levels in Ceramic-on-Ceramic THR with Cobalt-Chrome Modular Necks: Analysis of Cobalt and Chromium Serum Levels in 23 Healthy Hip Patients

2016 ◽  
Vol 27 (1) ◽  
pp. 21-25 ◽  
Author(s):  
Jan F.A. Somers ◽  
Lieven Dedrye ◽  
Sofie Goeminne
Keyword(s):  
Detection Limit ◽  
Hip Replacement ◽  
Metal Ion ◽  
Serum Levels ◽  
Ion Release ◽  
Modular Neck ◽  
Stem Design ◽  
Metal Ion Release ◽  
Cobalt Chrome ◽  
Ceramic On Ceramic

Background Modular necks in total hip replacement (THR) can be a source of metal ion release. Methods We measured the level of cobalt (Co) and chromium (Cr) ions in the serum of 23 healthy volunteers with a well-functioning ceramic-on-ceramic THR of a particular design, containing a cobalt-chrome (Co-Cr) stem and a Co-Cr modular neck. Results Average Co in serum was 1,71 μg/l; median Co was 1.50 μg/l. No patient had Co levels higher than 3.70 μg/l. Average Cr level was 0.49 μg/l; in all but one patient Cr was below the detection limit (≤0.50 μg/l). Co was higher for varus necks compared to all other subtypes: 2.14 μg/l vs 1.58 μg/l (p≤0.05). The same system with Titanium modular necks shows lower Co serum levels: 1.26 μg/l (p≤0.01). In conclusion, the hybrid THR Profemur Xm® – Procotyle L® with a Co-Cr modular neck on a Co-Cr stem design shows very low Cr ion serum levels in a randomly selected group of well-functioning hip patients. Conclusions Co ion serum levels are low, but significantly higher for 8° varus necks, and Co levels are significantly higher than values of this system with a Titanium modular neck.

Ceramic Insert Dislodgment After Revision Ceramic-on-Ceramic Total Hip Arthroplasty

2010 ◽  
Vol 25 (4) ◽  
pp. 660.e5-660.e7
Author(s):  
Chi Yin Tso ◽  
Kwok Hing Chiu ◽  
Kin Wing Cheung
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Total Hip ◽  
Ceramic Insert ◽  
Ceramic On Ceramic

Ceramic on Ceramic Bearings

2012 ◽  
Vol 04 (01) ◽  
pp. 93-103 ◽  
Author(s):  
Sukree Khumrak ◽  
Thanasak Yakampor
Keyword(s):  
Ceramic On Ceramic

scholarly journals Analysis of Chemisorbed Tribo-Film for Ceramic-on-Ceramic Hip Joint Prostheses by Raman Spectroscopy

2021 ◽  
Vol 12 (2) ◽  
pp. 29
Author(s):  
Risha Rufaqua ◽  
Martin Vrbka ◽  
Dušan Hemzal ◽  
Dipankar Choudhury ◽  
David Rebenda ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Hyaluronic Acid ◽  
Hip Joint ◽  
Total Joint Replacement ◽  
Film Formation ◽  
Frictional Coefficient ◽  
Synovial Fluids ◽  
Frictional Coefficients ◽  
Joint Prostheses ◽  
Ceramic On Ceramic

To understand the possible lubricant mechanism in ceramic-on-ceramic hip joint prostheses, biochemical reactions of the synovial fluid and the corresponding frictional coefficients were studied. The experiments were performed in a hip joint simulator using the ball-on-cup configuration with balls and cups made from two types of ceramics, BIOLOX®forte and BIOLOX®delta. Different lubricants, namely albumin, γ-globulin, hyaluronic acid and three model synovial fluids, were studied in the experiments and Raman spectroscopy was used to analyze the biochemical responses of these lubricants at the interface. BIOLOX®delta surface was found less reactive to proteins and model fluid lubricants. In contrast, BIOLOX®forte ball surface has shown chemisorption with both proteins, hyaluronic acid and model fluids imitating total joint replacement and osteoarthritic joint. There was no direct correlation between the measured frictional coefficient and the observed chemical reactions. In summary, the study reveals chemistry of lubricant film formation on ceramic hip implant surfaces with various model synovial fluids and their components.

The Optical Fiber Connector Ceramic Insert Core Injection Mold Design

2014 ◽  
Vol 624 ◽  
pp. 712-714
Author(s):  
Pei Yun Ao
Keyword(s):  
Optical Fiber ◽  
Structural Characteristics ◽  
Flow Characteristics ◽  
Powder Injection ◽  
Mold Design ◽  
Injection Mold ◽  
Additive Formulation ◽  
Injection Mold Design ◽  
Optical Fiber Connector ◽  
Ceramic Insert

According to the structural characteristics of optical fiber connector Ceramic insert core, this article analyzed the structure technology of it. Based on Mold wizard module and Pro/Moldsign module. We conducted injection mold design of optical fiber connector ceramic insert core; Put forward the flow characteristics of zirconia powder injection feeding and binder, lubricants and other additive formulation.

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