The mechanics of head-neck taper junctions: What do we know from finite element analysis?

Feyzi, Mohsen; Fallahnezhad, Khosro; Taylor, Mark; Hashemi, Reza

doi:10.1016/j.jmbbm.2021.104338

Cited by 22 publications

(33 citation statements)

References 55 publications

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“…Figure 8 depicts a cross-sectional view of the acetabular head–liner contact joint and acetabular head–neck contact joint since those are the region of interest for a hip implant for wear generation [ 9 , 19 ]. Figure 8 a shows the internal/external γ, the abduction/adduction β, and the flexion/extension α angles of the Z, Y, and X axes, respectively.…”

Section: Performance Study Of Hip Implant With Different Biomaterials...mentioning

confidence: 99%

“…To pick the ideal material for a hip implant that meets these criteria, it is required to test the performance metrics of a hip implant at multiple phases, namely those which are pre-clinical, in vitro, in vivo, and clinical. In the field of hip implants, the Finite Element Method (FEM) has proven its efficacy and capabilities in addressing the mechanical response of the implant in a cost-effective and pre-clinical environment [ 9 ]. According to the studies [ 8 , 9 , 10 , 11 ], computational finite element analysis (FEA) can be employed in the pre-clinical phase to evaluate four mechanical performance factors, such as von Mises stress and deformation [ 8 ], micromotion [ 10 ], wear estimation [ 9 ], and fatigue life estimation [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the field of hip implants, the Finite Element Method (FEM) has proven its efficacy and capabilities in addressing the mechanical response of the implant in a cost-effective and pre-clinical environment [ 9 ]. According to the studies [ 8 , 9 , 10 , 11 ], computational finite element analysis (FEA) can be employed in the pre-clinical phase to evaluate four mechanical performance factors, such as von Mises stress and deformation [ 8 ], micromotion [ 10 ], wear estimation [ 9 ], and fatigue life estimation [ 11 ]. During in vitro, in vivo, and clinical phases, the biocompatibility and adverse local tissue reactions of the hip implant system are evaluated.…”

Section: Introductionmentioning

confidence: 99%

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A Review of Biomaterials and Associated Performance Metrics Analysis in Pre-Clinical Finite Element Model and in Implementation Stages for Total Hip Implant System

et al. 2022

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Total hip replacement (THR) is a common orthopedic surgery technique that helps thousands of individuals to live normal lives each year. A hip replacement replaces the shattered cartilage and bone with an implant. Most hip implants fail after 10–15 years. The material selection for the total hip implant systems is a major research field since it affects the mechanical and clinical performance of it. Stress shielding due to excessive contact stress, implant dislocation due to a large deformation, aseptic implant loosening due to the particle propagation of wear debris, decreased bone remodeling density due to the stress shielding, and adverse tissue responses due to material wear debris all contribute to the failure of hip implants. Recent research shows that pre-clinical computational finite element analysis (FEA) can be used to estimate four mechanical performance parameters of hip implants which are connected with distinct biomaterials: von Mises stress and deformation, micromotion, wear estimates, and implant fatigue. In vitro, in vivo, and clinical stages are utilized to determine the hip implant biocompatibility and the unfavorable local tissue reactions to different biomaterials during the implementation phase. This research summarizes and analyses the performance of the different biomaterials that are employed in total hip implant systems in the pre-clinical stage using FEA, as well as their performances in in vitro, in vivo, and in clinical studies, which will help researchers in gaining a better understanding of the prospects and challenges in this field.

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Section: Performance Study Of Hip Implant With Different Biomaterials...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Review of Biomaterials and Associated Performance Metrics Analysis in Pre-Clinical Finite Element Model and in Implementation Stages for Total Hip Implant System

et al. 2022

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“…Tribocorrosion of Ti-6Al-4 V (used extensively for manufacturing biomedical implants) has been reported to cause inflammation which may ultimately lead to implant failure [18][19][20][21][22]. A number of studies published in the literature have investigated the role of oxidation in the tribocorrosion of Ti-6Al-4 V. Runa et al [12] studied the tribocorrosion of this alloy in phosphate buffered saline (PBS) with a key focus on the role of proteins present in the solution under different anodic potentials.…”

Section: Introductionmentioning

confidence: 99%

The Tribocorrosion Behaviour of Ti-6Al-4 V Alloy: The Role of Both Normal Force and Electrochemical Potential

et al. 2022

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The tribocorrosion behaviour of Ti-6Al-4 V exposed to phosphate buffered saline was investigated under a range of normal forces in both cathodic and anodic regions to provide a basis for properly deriving the tribological constants of this alloy. To achieve this, a new customised tribotester was designed and manufactured to rub the Ti-6Al-4 V disks against zirconia balls. The tests were conducted at a sliding frequency of 1 Hz and a sliding distance of 4.8 mm under various normal forces and potentials as 17.5, 10.8, 6, 3.5 N, and − 1.2, − 0.6, 0, 0.4, 0.8 V/VAg/AgCl, respectively. The damaged surfaces were characterised by scanning electron microscopy and energy-dispersive X-ray spectroscopy, profilometer, and micro-hardness tester. The post analyses confirmed the appearance of some minor cracks together with third-body wear particles. No significant changes in the hardness were detected after the tribocorrosion tests. The results of profilometry and electrochemical current indicated that in the anodic region the chemical losses accounted for a significant proportion (up to 36%) of the total loss. The proportional chemical loss increased with the potential; however, neither direct nor reverse relationship was found with the normal force. Overall, in the anodic domain, the material loss increased with the potential level due to the formation of oxide layer which may induce more shear cutting. In the cathodic domain, hydrogen embrittlement changed the properties of the interface and thus, the amount of material loss. Both the mechanical and chemical wear were described by an existing tribocorrosion theory; thereby, the theory was equipped with its tribocorrosive constants for future analyses on the tribocorrosion of this alloy extensively used in various applications including biomedical implants.

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“…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

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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.

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The mechanics of head-neck taper junctions: What do we know from finite element analysis?

Cited by 22 publications

References 55 publications

A Review of Biomaterials and Associated Performance Metrics Analysis in Pre-Clinical Finite Element Model and in Implementation Stages for Total Hip Implant System

A Review of Biomaterials and Associated Performance Metrics Analysis in Pre-Clinical Finite Element Model and in Implementation Stages for Total Hip Implant System

The Tribocorrosion Behaviour of Ti-6Al-4 V Alloy: The Role of Both Normal Force and Electrochemical Potential

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

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