Effects of seating load magnitude and load orientation on seating mechanics in 5°40′ mixed-alloy modular taper junctions

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

doi:10.1016/j.jbiomech.2018.10.037

Cited by 7 publications

(12 citation statements)

References 14 publications

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“…Based on a trigonometric model, a misalignment up to 20 • could be tolerated, as 94% of the impacting force would still be maintained in the correct direction. 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].…”

Section: Surgeon-related Factors Determining Taper Fixationsupporting

confidence: 67%

“…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%

“…This may lead to the cell-induced corrosion of the taper interface [93]. Improperly seated heads may develop micromotions under physiological loads large enough for macrophages to penetrate the interface and contribute to taper corrosion and failure [52]. This may also be the case with heads engaging the taper proximally, which is the rule for ceramic heads [24].…”

Section: Discussionmentioning

confidence: 99%

“…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: 67%

Section: Technical Aspects Of Taper Connections In Hip Arthroplastymentioning

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Technical Aspects Of Taper Connections In Hip Arthroplastymentioning

confidence: 99%

See 2 more Smart Citations

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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“…The taper angle mismatch tolerance between the head and neck was the same for both groups and the throat engagement was typical for ceramic tapers (ie, the head angle was slightly larger than the trunnion). The engagement length for the head‐neck tapers was approximately 11 mmas is typical for modular taper junctions 25 . A hydraulic mechanical testing system (MTS Model 515 HPU, MTS; Eden Prairie, MN) was used to apply cyclic loads to the head‐neck construct and the test assembly with sample, environment, and electrodes is shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Fretting corrosion of Si₃N₄ vs CoCrMo femoral heads on Ti‐6Al‐V trunnions

Khullar

Zhu

Gilbert

2020

Journal Orthopaedic Research

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Fretting corrosion at the head‐neck taper junction was compared between silicon nitride (Si3N4) and commercially available cobalt chrome (CoCrMo) femoral heads on titanium (Ti‐6Al‐4V) trunnions. An electrochemical setup was used to capture the fretting currents (characterized by oxide abrasion and repassivation) during cyclic loading. Onset load, pull‐off force (disassembly load), short term and long term (1 million cycles) fretting currents were used to compare the fretting corrosion performance between the test group (Si3N4/Ti‐6Al‐4V) and the control group (CoCrMo/Ti‐6Al‐4V). Incremental cyclic fretting corrosion tests showed that the Si3N4/Ti‐6Al‐4V combination had statistically lower (P < .05) average fretting current of 0.189 µA (SD = 0.114 µA) compared to 0.685 µA (SD = 0.630 µA) for CoCrMo/Ti‐6Al‐4V for cyclic load of 3200 N. Similarly, for the one million cycle fretting corrosion tests, the Si3N4/Ti‐6Al‐4V couples had statistically lower (P < .05) average current (0.048 µA, SD = 0.025 µA) vs CoCrMo/Ti‐6Al‐4V couples (0.366 µA, SD = 0.143 µA). The Si3N4 heads also had higher onset loads (P < .05) for fretting (vs CoCrMo, 2200 N vs 1740 N) indicating a difference in surface contact mechanics between the two groups. Scanning electron microscopy with energy dispersive spectroscopy confirmed material transfer from the trunnions to the heads for both groups tested, and from head to trunnion for the CoCrMo heads. Minimal Si3N4 transfer was noted. The electrochemical, mechanical, and microscopic inspection data supported the hypothesis that Si3N4/Ti‐6Al‐4Vcombination had better fretting corrosion performance compared to CoCrMo/Ti‐6Al‐4V.

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Interfacial compliance, energy dissipation, frequency effects, and long‐term fretting corrosion performance of Ti‐6Al‐4V/CoCrMo interfaces

Smith

Gilbert

2021

J Biomedical Materials Res

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Fretting corrosion in modular orthopedic implants is a well‐documented process that may be associated with adverse local tissue reactions, pain, and revisions. Engineering modular junction interfaces to withstand applied fretting motion without surface abrasion could prevent implant degradation and surface damage. Previous work on geometrically modified Ti‐6Al‐4V/CoCrMo interfaces with increased compliance showed reduced fretting currents and surface damage during short term, variable‐load in vitro testing. This study assesses the same interfaces under long‐term conditions using an in vitro pin‐on‐disk fretting corrosion test apparatus. Preliminary variable‐load frequency testing of typical control pin geometries showed a frequency‐dependent current response, with underlying contact conditions of metal–metal interfaces that remained unchanged. One‐million‐cycle testing showed diminished fretting currents in all groups by 5 × 105 cycles, but consistently lower currents in the high‐compliance group. Corresponding fretting currents and work of fretting measurements of high‐compliance pins confirmed that minimal fretting was experienced at the interface, with elastic bending of the pin accounting for almost all applied displacement. Debris generated during testing were composed of titanium and chromium oxides, small amounts of cobalt and molybdenum oxides, and sodium and phosphate originating from the surrounding test solution. Post‐test analyses of sample surfaces revealed substantially more surface damage on CoCrMo disks than Ti‐6Al‐4V pins, thought to be a result of adhesive wear of mixed oxide debris on the pin and abrasion of the disk by the oxide debris layer. Surface damage to high‐compliance pins suggests some abrasion is unavoidable with geometric modifications.

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Effects of seating load magnitude and load orientation on seating mechanics in 5°40′ mixed-alloy modular taper junctions

Cited by 7 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

Fretting corrosion of Si₃N₄ vs CoCrMo femoral heads on Ti‐6Al‐V trunnions

Interfacial compliance, energy dissipation, frequency effects, and long‐term fretting corrosion performance of Ti‐6Al‐4V/CoCrMo interfaces

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Effects of seating load magnitude and load orientation on seating mechanics in 5°40′ mixed-alloy modular taper junctions

Cited by 7 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

Fretting corrosion of Si3N4 vs CoCrMo femoral heads on Ti‐6Al‐V trunnions

Interfacial compliance, energy dissipation, frequency effects, and long‐term fretting corrosion performance of Ti‐6Al‐4V/CoCrMo interfaces

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Product

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Fretting corrosion of Si₃N₄ vs CoCrMo femoral heads on Ti‐6Al‐V trunnions