Effects of Seating Load Magnitude on Incremental Cyclic Fretting Corrosion in 5°40’ Mixed Alloy Modular Taper Junctions

Pierre, David; Swaminathan, Viswanathan; Scholl, Laura; TenHuisen, Kevor S.; Gilbert, Jeremy L.

doi:10.1016/j.arth.2018.01.039

Cited by 12 publications

(12 citation statements)

References 14 publications

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“…This is confirmed experimentally, with fixation forces not altered significantly by seating loads applied at 20 • [52]. Asymmetries of the seating load displacement could, however, be observed at the taper [51,52], and this might explain notable differences in the fixation force observed with off-axis impactions of only 10 • , when combined in different planes [80]. Axis deviations of more than 20 • are common during THA, at least when using a posterior approach to the hip [81].…”

Section: Surgeon-related Factors Determining Taper Fixationsupporting

confidence: 71%

“…When all other parameters are equal, MacLeod's model estimates a higher fixation force than Fessler's model by about a third ( Figure 2). However, when considering the technical aspects of the different experimental setups, nearly all fixation force values described in the literature correspond to the values estimated by Fessler's formula, ranging 40% to 55% of the impaction force [6,21,44,[47][48][49][50][51][52]. Surprisingly, the values measured by MacLeod et al do not correspond to those estimated by their own model [43].…”

Section: Technical Aspects Of Taper Connections In Hip Arthroplastymentioning

confidence: 70%

“…In both models, the fixation force correlates linearly with the force applied to impact the taper. The fixation force, therefore, has a major effect on the stability of the taper connection [6,[44][45][46][47][48][49][50][51][52]. Because the taper angle α is determined by the chosen prosthesis design (typically between 5 • 30 and 6 • [36]), this parameter has to be considered as fixed.…”

Section: Technical Aspects Of Taper Connections In Hip Arthroplastymentioning

confidence: 99%

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What the Surgeon Can Do to Reduce the Risk of Trunnionosis in Hip Arthroplasty: Recommendations from the Literature

Rieker

Wahl

2020

Materials

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Trunnionosis, defined as wear and corrosion at the head-neck taper connection, is a cause of failure in hip arthroplasty. Trunnionosis is linked to a synergistic combination of factors related to the prosthesis, the patient, and the surgeon. This review presents analytical models that allow for the quantification of the impact of these factors, with the aim of providing practical recommendations to help surgeons minimize the occurrence of this failure mode. A tighter fit reduces micromotion and, consequently, fretting of the taper connection. The paramount parameters controlling the fixation force are the coefficient of friction and the impaction force. The influence of the head diameter, as well as of the diameter and angle of the taper, is comparatively small, but varus alignment of the taper and heads with longer necks are unfavourable under physiologic loads. The trunnion should be rinsed, cleaned, and dried carefully, while avoiding any contamination of the bore-the female counterpart within the head-prior to assembly. Biological debris, and even residual water, might critically reduce the fixation of the taper connection between the head and the neck. The impaction force applied to the components should correspond to at least two strong blows with a 500 g hammer, striking the head with an ad hoc impactor aligned with the axis of the taper. These strong blows should correspond to a minimum impaction force of 4000 N.

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Section: Surgeon-related Factors Determining Taper Fixationsupporting

confidence: 71%

Section: Technical Aspects Of Taper Connections In Hip Arthroplastymentioning

confidence: 70%

Section: Technical Aspects Of Taper Connections In Hip Arthroplastymentioning

confidence: 99%

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What the Surgeon Can Do to Reduce the Risk of Trunnionosis in Hip Arthroplasty: Recommendations from the Literature

Rieker

Wahl

2020

Materials

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“…Other studies computed the elastic deformation based on an elastic static stiffness calibration instead of monoblock or FE analysis, which might still be comprised of micromotion and residual elastic deformation. 22,51 The extension to six individual degrees of freedom allowed a detailed analysis of the mechanics within the head junction, especially if, different from here, joint friction moments are to be applied. Moreover, the choice of implant components used in this study reflects a best-case scenario by using almost neutral head lengths and no additional joint friction moments.…”

Section: Discussionmentioning

confidence: 99%

Do SiNx coatings bear the potential to reduce the risk of micromotion in modular taper junctions?

Haschke

Falkenberg

Morlock

et al. 2020

Proc Inst Mech Eng H

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Fretting corrosion is one contributor to the clinical failure of modular joint arthroplasty. It is initiated by micromotion in metal junctions exposed to fluids. Omitting metal-on-metal contacts could help to reduce the corrosion risk. The coating of one metal taper partner with a ceramic-based silicon nitride (SiNx) coating might provide this separation. The aim of the study was to identify whether a SiNx coating of the male taper component influences the micromotion within a taper junction. Hip prosthesis heads made of CoCr29Mo6 (Aesculap) and Ti6Al4V (Peter Brehm) were assembled (2000 N) to SiNx-coated and uncoated stem tapers made of Ti6Al4V and CoCr29Mo6 (2×2×2 combinations, each n = 4). Consecutive sinusoidal loading representing three daily activities was applied. Contactless relative motion in six degrees of freedom was measured using six eddy-current sensors. Micromotion in the junction was determined by compensating for the elastic deformation derived from additional monoblock measurements. After pull-off, the taper surfaces were microscopically inspected. Micromotion magnitude reached up to 8.4 ± 0.8 µm during loading that represented stumbling. Ti6Al4V stems showed significantly higher micromotion than those made of CoCr29Mo6, while taper coating had no influence. Statistical differences in pull-off forces were found for none of the taper junctions. Microscopy revealed CoCr29Mo6 abrasion from the head taper surface if combined with coated stem tapers. Higher micromotion of Ti6Al4V tapers was probably caused by the lower Young’s modulus. Even in the contact areas, the coating was not damaged during loading. The mechanics of coated tapers was similar to uncoated prostheses. Thus, the separation of the two metal surfaces with the objective to reduce in vivo corrosion appears to be achievable if the coating is able to withstand in vivo conditions. However, the hard ceramic-based stem coating lead to undesirable debris from the CoCr29Mo6 heads during loading.

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“…One of the few individual factors that have been found to consistently affect taper performance was assembly. [26][27][28][29][30][31][32][33][34][35][36] In summary, the studies demonstrated that increasing the assembly force of these 'self-locking' tapers increased: seating displacement, 26,27,32,37 disassembly force, 26,28,29,33,35 engagement, 36,38 deformation at the interface, 36,38 and in the short to medium term, a reduction in the amount of motion 27,32 and frettingcorrosion. 27,30,31,34,37 Other variables present during in-vivo assembly of the head and stem, such as fluid contamination, has been found to affect the taper junction.…”

Section: Introductionmentioning

confidence: 99%

Importance of surgical assembly technique on the engagement of 12/14 modular tapers

Wade

Webster

Beadling

et al. 2021

Proc Inst Mech Eng H

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Fretting-corrosion at the modular taper junction in total hip replacements (THR), leading to implant failure, has been identified as a clinical concern and has received increased interest in recent years. There are many parameters thought to affect the performance of the taper junction, with the assembly process being one of the few consistently identified to have a direct impact. Despite this, the assembly process used by surgeons during THR surgery differs from a suggested ‘ideal’ process. For example, taper junctions of cutting tools should be pushed together rather than impacted, while ensuring as much concentricity as possible between the male and female taper and loading axis. This study devised six simple assembly methodologies to investigate how surgical variations affect the success of the compressive fit achieved at the taper interface compared to a controlled assembly method, designed to represent a more ‘ideal’ scenario. Key findings from this study suggest that a more successful and repeatable engagement can be achieved by quasi-statically loading the male and female taper concentrically with the loading axis. This was shown by a greater disassembly to assembly force ratio of 0.626 ± 0.07 when assembled using the more ‘ideal’ process, compared to 0.480 ± 0.05 when using a method closer to that used by a surgeon intraoperatively. Findings from this study can be used to help inform new surgical instrumentation and an improved surgical assembly method.

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Effects of Seating Load Magnitude on Incremental Cyclic Fretting Corrosion in 5°40’ Mixed Alloy Modular Taper Junctions

Cited by 12 publications

References 14 publications

What the Surgeon Can Do to Reduce the Risk of Trunnionosis in Hip Arthroplasty: Recommendations from the Literature

What the Surgeon Can Do to Reduce the Risk of Trunnionosis in Hip Arthroplasty: Recommendations from the Literature

Do SiNx coatings bear the potential to reduce the risk of micromotion in modular taper junctions?

Importance of surgical assembly technique on the engagement of 12/14 modular tapers

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