Numerical Analysis on the Influence of Taper Junction Corrosion Profile With Emphasis on Ti-Alloy Modular Hip Arthroplasty

2017 ◽  
Author(s):  
Adam Novotny ◽  
Manish Paliwal
Keyword(s):  
Titanium Alloy ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Structural Integrity ◽  
The Body ◽  
Total Hip ◽  
Corrosion Resistant Alloy ◽  
Titanium Alloy Ti6al4v ◽  
Modular Implant

Modular designs give orthopaedic surgeons a greater flexibility to custom fit the implant to the patients bone while performing total hip arthroplasty. Titanium alloy (Ti6Al4V (ASTM F-136)) is typically used for modular hip implant stems. This highly corrosion resistant alloy forms passive surface oxide films spontaneously. However, with modular designs, micro-motion may occur at the taper junctions during mechanical loading. Crevices between the taper junctions may allow the body fluids to enter and remain stagnant. These conditions make the modular tapers susceptible to fatigue and mechanically assisted crevice corrosion. The in vivo degradation of metal alloy implants compromises the structural integrity. The influence of stress corrosion induced pits of a titanium-alloy modular implant in cement-less total hip arthroplasty was numerically investigated. The effect of pit geometry parameters — cylindrical, conical, and hemispherical dimple are compared and discussed in terms of taper performance.

Numerical Analysis on Stress Induced Corrosion With Emphasis on Ti-Alloy Total Hip Arthroplasty Stem Failure

2013 ◽  
Author(s):  
Manish Paliwal
Keyword(s):  
Titanium Alloy ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Structural Integrity ◽  
The Body ◽  
Total Hip ◽  
Corrosion Resistant Alloy ◽  
Titanium Alloy Ti6al4v ◽  
Modular Implant

Modular designs give orthopaedic surgeons a greater flexibility to custom fit the implant to the patients bone while performing total hip arthroplasty. Titanium alloy (Ti6Al4V (ASTM F-136)) is typically used for modular hip implant stems. This highly corrosion resistant alloy forms passive surface oxide films spontaneously. However, with modular designs, micro-motion may occur at the taper junctions during mechanical loading. Crevices between the taper junctions may allow the body fluids to enter and remain stagnant. These conditions make the modular tapers susceptible to fatigue and mechanically assisted crevice corrosion. The in vivo degradation of metal alloy implants compromises the structural integrity. The influence of stress induced corrosion and pitting leading to the in vivo catastrophic failure of a titanium-alloy modular implant in cementless total hip arthroplasty was numerically investigated. The effect of pit geometric parameters are discussed in terms of taper performance.

Stochastic Modeling of Crevice Corrosion With Emphasis on Titanium Alloys Modular Total Joint Arthroplasty

2014 ◽  
Author(s):  
Sandeep Rajput ◽  
Manish Paliwal
Keyword(s):  
Stochastic Modeling ◽  
Crevice Corrosion ◽  
Structural Integrity ◽  
The Body ◽  
Enhanced Dissolution ◽  
Close Proximity ◽  
Corrosion Resistant Alloy ◽  
Micro Motion ◽  
Titanium Alloy Ti6al4v

Titanium alloy (Ti6Al4V (ASTM F-136)) is typically used for modular hip implant stems. This highly corrosion resistant alloy forms passive surface oxide films spontaneously. However, with modular designs, micro-motion may occur at the taper junctions during mechanical loading. Complex physical/chemical reactions take place which may result in pitting and crevice corrosion. Crevices between the taper junctions may allow the body fluids to enter and remain stagnant. These conditions make the modular tapers susceptible to fatigue and mechanically assisted crevice corrosion. When two or more surfaces are in close proximity, it leads to the creation of a locally blocked region in which enhanced dissolution may occur. The in vivo degradation of metal alloy implants compromises the structural integrity. Stochastic modeling of crevice corrosion is performed based on the mechanism behind the phenomenon. Sensitivity analysis is performed, and conclusions drawn.

Cement mantle thickness does not influence serum or local gentamicin concentrations in hybrid total hip arthroplasty: a randomised controlled trial

2018 ◽  
Vol 28 (4) ◽  
pp. 415-421 ◽  
Author(s):  
Willem van IJperen ◽  
Damien Van Quickenborne ◽  
Ronald Buyl ◽  
Thierry Scheerlinck
Keyword(s):  
Total Hip Arthroplasty ◽  
Bone Cement ◽  
Hip Arthroplasty ◽  
Controlled Trial ◽  
Cement Mantle ◽  
Total Hip ◽  
Drain Fluid ◽  
Randomised Controlled ◽  
Mantle Thickness

Introduction: We investigated the in vivo gentamicin elution kinetics of Hi-Fatigue Gentamicin Bone Cement (AAP Biomaterials GmbH) in serum and drain fluid after hybrid hip arthroplasty and the relationship with cement mantle thickness. Methods: We compared in a randomised, non-blinded prospective study, the local and systemic gentamicin concentrations in 2 groups. The thin cement mantle group ( n = 16) received a stem implanted line-to-line with the broach, whereas the thick group ( n = 14) had an undersized stem. Gentamicin concentrations were measured in drain fluid and serum at set intervals for 3 days postoperatively. Results: In both groups, local gentamicin concentrations were similar. After a high initial burst above the minimal inhibitory concentration (thin: 57.2 mg/L (SD 34.4), thick: 54.9 mg/L (SD 19.9), p = 0.823) local gentamicin concentrations declined rapidly. In both groups, serum concentrations never exceeded toxic levels (maximum 1.08 mg/L). Conclusion: In hybrid total hip arthroplasty, Hi-Fatigue Gentamicin Bone Cement resulted in effective and safe gentamicin concentrations. Clinical trial protocol number: PMCI 12/02.

scholarly journals In vivo kinematics, component alignment and hardware variables influence on the liner-to-neck clearance during chair-rising after total hip arthroplasty

2020 ◽  
Vol 25 (3) ◽  
pp. 452-459 ◽  
Author(s):  
Kyohei Shiomoto ◽  
Satoshi Hamai ◽  
Daisuke Hara ◽  
Hidehiko Higaki ◽  
Hirotaka Gondo ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Component Alignment ◽  
Total Hip ◽  
In Vivo Kinematics

scholarly journals Radiographic Underestimation of In Vivo Cup Coverage Provided by Total Hip Arthroplasty for Dysplasia

Orthopedics ◽  
2017 ◽  
Vol 41 (1) ◽  
pp. e46-e51 ◽  
Author(s):  
Yong Nie ◽  
HaoYang Wang ◽  
ZeYu Huang ◽  
Bin Shen ◽  
Virginia Byers Kraus ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Total Hip
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