A finite element study on the mechanical response of the head-neck interface of hip implants under realistic forces and moments of daily activities: Part 2

Fallahnezhad, Khosro; Farhoudi, Hamidreza; Oskouei, Reza Hashemi; Taylor, Mark

doi:10.1016/j.jmbbm.2017.08.038

Cited by 23 publications

(12 citation statements)

References 31 publications

(41 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At 3,300 N peak compressive loading, corrosion current decreased by 30% once joint movement was stopped and 3,300 N cyclic compression was allowed to continue in the same test sequence. Farhoudi et al 27 performed a finite element analysis to investigate the effect of superimposing gait induced frictional moments over gait’s compression. They found compression during gait largely dictated the connection mechanics, but frictional moments increased micromotion by 15%.…”

Section: Discussionmentioning

confidence: 99%

Effect of head size and rotation on taper corrosion in a hip simulator

et al. 2021

View full text Add to dashboard Cite

Aims This study investigates head-neck taper corrosion with varying head size in a novel hip simulator instrumented to measure corrosion related electrical activity under torsional loads. Methods In all, six 28 mm and six 36 mm titanium stem-cobalt chrome head pairs with polyethylene sockets were tested in a novel instrumented hip simulator. Samples were tested using simulated gait data with incremental increasing loads to determine corrosion onset load and electrochemical activity. Half of each head size group were then cycled with simulated gait and the other half with gait compression only. Damage was measured by area and maximum linear wear depth. Results Overall, 36 mm heads had lower corrosion onset load (p = 0.009) and change in open circuit potential (OCP) during simulated gait with (p = 0.006) and without joint movement (p = 0.004). Discontinuing gait’s joint movement decreased corrosion currents (p = 0.042); however, wear testing showed no significant effect of joint movement on taper damage. In addition, 36 mm heads had greater corrosion area (p = 0.050), but no significant difference was found for maximum linear wear depth (p = 0.155). Conclusion Larger heads are more susceptible to taper corrosion; however, not due to frictional torque as hypothesized. An alternative hypothesis of taper flexural rigidity differential is proposed. Further studies are necessary to investigate the clinical significance and underlying mechanism of this finding. Cite this article: Bone Jt Open 2021;2(11):1004–1016.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of head size and rotation on taper corrosion in a hip simulator

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In such situations, aggressive Cl − ions may attack the implant material surface. For instance, fretting wear is known to occur at the interface of modular junctions (for example, head-neck taper junction of hip implants) due to relative micro-motions [23][24][25][26]. The fretting wear disrupts the passive oxide layer causing corrosion to occur in the alloy in vivo.…”

Section: Introductionmentioning

confidence: 99%

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

Afzali

Ghomashchi

Oskouei

2019

Metals

View full text Add to dashboard Cite

The corrosion behaviour of new generation titanium alloys (β-type with low modulus) for medical implant applications is of paramount importance due to their possible detrimental effects in the human body such as release of toxic metal ions and corrosion products. In spite of remarkable advances in improving the mechanical properties and reducing the elastic modulus, limited studies have been done on the electrochemical corrosion behaviour of various types of low modulus titanium alloys including the effect of different beta-stabilizer alloying elements. This development should aim for a good balance between mechanical properties, design features, metallurgical aspects and, importantly, corrosion resistance. In this article, we review several significant factors that can influence the corrosion resistance of new-generation titanium alloys such as fabrication process, body electrolyte properties, mechanical treatments, alloying composition, surface passive layer, and constituent phases. The essential factors and their critical features are discussed. The impact of various amounts of α and β phases in the microstructure, their interactions, and their dissolution rates on the surface passive layer and bulk corrosion behaviour are reviewed and discussed in detail. In addition, the importance of different corrosion types for various medical implant applications is addressed in order to specify the significance of every corrosion phenomenon in medical implants.

show abstract

“…Previous studies have shown that a number of parameters, such as material combination, taper geometry and the patients' weight and activities can in uence the mechanical behaviour of the head-neck junction and affect the amount of the material loss, due to fretting corrosion (Fallahnezhad et al 2018a;Fallahnezhad et al 2017;Farhoudi et al 2017;Feyzi et al 2021a;Feyzi et al 2021b). The force applied by surgeons to assemble the head-neck junction is reported to range from 3000 to 7000 N (Nassutt et al 2006).…”

Section: Introductionmentioning

confidence: 99%

The role of the assembly force in the tribocorrosion behaviour of hip implant head-neck junctions: An adaptive finite element approach

Fallahnezhad

Feyzi

Hashemi

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

The cyclic loading, in the corrosive medium of the human body, results in tribocorrosion, at the interface of the head neck taper junction of hip implants. The resulting metal ions and wear debris can have adverse effects on the local tissues. The force applied by surgeons to assemble the head-neck junction is proven to play a major role in the mechanics of the taper junction which in turn can influence the tribocorrosion damage. Recently, finite element method has been used to predict the material loss at the head-neck interface. However, in most previous finite element studies, the contribution of electrochemical corrosion has been ignored. Therefore, a detailed study to investigate the influence of the assembly force on the tribocorrosive behaviour of the head-neck junction, taking into account both the mechanical and chemical material removal, is of paramount interest. In this study, a finite-element-based algorithm was used to investigate the effect of assembly force on the tribocorrosion damage at the junction interface over 4 million cycles of simulated level gait. The patterns of the material removal in the modelling results were compared with the damage patterns observed in a group of retrieved modular hip implants. The results of this study showed that chemical wear, after four million cycles, for different cases, was in the range of 25%-32% of the total material loss. A minimum assembly force (4 kN for the studied cases) is needed to maintain the interlock in the junction. Increasing the assembly force above this value does not further reduce the material loss. The computational model was able to predict the damage pattern at the retrieved head-neck interface.

show abstract

A finite element study on the mechanical response of the head-neck interface of hip implants under realistic forces and moments of daily activities: Part 2

Cited by 23 publications

References 31 publications

Effect of head size and rotation on taper corrosion in a hip simulator

Effect of head size and rotation on taper corrosion in a hip simulator

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

The role of the assembly force in the tribocorrosion behaviour of hip implant head-neck junctions: An adaptive finite element approach

Contact Info

Product

Resources

About