Open AccessJournal Article10.1177/0954411916648717

Assembly force and taper angle difference influence the relative motion at the stem–neck interface of bi-modular hip prostheses

- 10 May 2016

- Vol. 230, Iss: 7, pp 690-699

TL;DR: Investigating whether the assembly force influences the relative motion and seating behaviour at the stem–neck interface of a bi-modular hip prosthesis and whether this relation is influenced by the taper angle difference between male and female taper angles found that prostheses with larger tapers exhibited decreased relative motion.

Abstract: Bi-modular hip arthroplasty prostheses allow adaptation to the individual patient anatomy and the combination of different materials but introduce an additional interface, which was related lately to current clinical issues. Relative motion at the additional taper interface might increase the overall risk of fretting, corrosion, metallic debris and early failure. The aim of this study was to investigate whether the assembly force influences the relative motion and seating behaviour at the stem–neck interface of a bi-modular hip prosthesis (Metha®; Aesculap AG, Tuttlingen, Germany) and whether this relation is influenced by the taper angle difference between male and female taper angles. Neck adapters made of titanium (Ti6Al4V) and CoCr (CoCr29Mo) were assembled with a titanium stem using varying assembly forces and mechanically loaded. A contactless eddy current measurement system was used to record the relative motion between prosthesis stem and neck adapter. Higher relative motion was observed for Ti ne...

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1. What are the contributions in "Assembly force and taper angle difference influence the relative motion at the stem–neck interface of bi-modular hip prostheses" ?

Bi-modular hip arthroplasty prostheses allow adaptation to the individual patient anatomy and the combination of different materials but introduce an additional interface, which was related lately to current clinical issues.. The aim of this study was to investigate whether the assembly force influences the relative motion and seating behaviour at the stem–neck interface of a bi-modular hip prosthesis ( Metha ; Aesculap AG, Tuttlingen, Germany ) and whether this relation is influenced by the taper angle difference between male and female taper angles.

2. What are the future works mentioned in the paper "Assembly force and taper angle difference influence the relative motion at the stem–neck interface of bi-modular hip prostheses" ?

It might be possible that shifting the position of the interlock closer to the proximal plane might reduce micromotion and seal the taper interface distally to the interlock ; this should be addressed in future studies.

Figure 10. (a) Transversal section through stem (Ti) and neck adapter (CoCr) after assembly with 6 kN, (b) coloured SEM image of the anterior section of the taper interface and (c) coloured SEM image of the medio-posterior edge. The taper interlock is located in the spherical sections in the medial and lateral directions (dashed red line), while a clear gap with contaminations is visible at the anterior and posterior sections.

Table 2. Secondary seating distances and durations for the different neck materials and assembly forces.

Figure 9. (a) Higher assembly forces led to significantly reduced secondary seating distances and seating durations (CoCr). (b) The seating behaviour was characterized with an interpolation (exponential function). Seating distance and duration were measured at the fivefold time constant (5t).

Figure 1. Bi-modular hip prosthesis used in the experiments consisting of a stem, neck adapter and ball head with a female stem taper angle (b) and a distal male taper angle (a). The top right insert shows a top view of the male neck adapter taper consisting of two hemi-tapers and two flats.

Figure 11. (a) Infinite focus variation image of the gap between neck and stem taper on the anterior side of section 4 and (b) measurement of the gap width (50mm). The finite depth is due to the residue of the polishing process.

Figure 4. Measurement setup for the determination of seating distances at the taper junction using reference markers. A coordinate measurement machine obtained the positions of the proximal plane of the neck adapter, ball head centre, reference markers and proximal stem plane.

Citations

•Journal Article•10.1007/S11420-016-9526-4

Corrosion of the Head-Stem Taper Junction-Are We on the Verge of an Epidemic?: Review Article.

Michael M. Morlock, +3 more

- 01 Feb 2017

- HSS Journal

TL;DR: This study aimed to review the mechanical and electrochemical relationships that may lead to taper corrosion, which have been reported more commonly in recent literature, and to also review the contribution of patient characteristics and surgical techniques involved in taper assembly that may contribute to the problem.

...read moreread less

Journal Article•10.1016/J.JBIOMECH.2019.109424

Micromotion at the head-stem taper junction of total hip prostheses is influenced by prosthesis design-, patient- and surgeon-related factors.

Adrian Falkenberg, +3 more

- 02 Jan 2020

- Journal of Biomechanics

TL;DR: This study accentuates the susceptibility of taper junctions to a variety of factors, which need to be appreciated in preoperative planning and surgical procedure to reduce the amount of micromotion and such minimize the risk of critical corrosion.

...read moreread less

•Journal Article•10.1016/J.MEDENGPHY.2016.11.001

Effect of trunnion roughness and length on the modular taper junction strength under typical intraoperative assembly forces

Sabrina Jauch-Matt, +2 more

- 01 Jan 2017

- Medical Engineering & Physics

TL;DR: Results of this study showed that smooth tapers provided a higher strength for taper junctions, which may reduce the risk of fretting-related complications especially in the most common range of intraoperative assembly forces.

...read moreread less

Journal Article•10.1016/J.BIOTRI.2017.07.002

Biomechanical Evaluation of the Fatigue Performance, the Taper Corrosion and the Metal Ion Release of a Dual Taper Hip Prosthesis under Physiological Environmental Conditions

Marc Baxmann, +4 more

- 01 Dec 2017

- Biotribology

TL;DR: The developed experimental two-stage testing method, using bovine serum and the adapted iron-chloride solution, is a promising approach to simulate the complex physiological environment in vitro to assess the performance of taper junctions prior to clinical use.

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Journal Article•10.1002/JBM.A.37299

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

Stephanie M. Smith, +1 more

- 17 Aug 2021

- Journal of Biomedical Materials Research...

TL;DR: In this paper, the same authors assessed the same interfaces under long-term conditions using an in vitro pin-on-disk fretting corrosion test apparatus and found that minimal fretting was experienced at the interface, with elastic bending of the pin accounting for almost all applied displacement.

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References

Journal Article•10.1016/S0021-9290(01)00040-9

Hip contact forces and gait patterns from routine activities.

Georg Bergmann, +6 more

- 01 Jul 2001

- Journal of Biomechanics

TL;DR: The paper focuses on the loading of the femoral implant component but complete data are additionally stored on an associated compact disc that contains complete gait and hip contact force data as well as calculated muscle activities during walking and stair climbing and the frequencies of daily activities observed in hip patients.

...read moreread less

2.3K

Journal Article•10.1302/0301-620X.92B1.22770

Early failure of metal-on-metal bearings in hip resurfacing and large-diameter total hip replacement: A CONSEQUENCE OF EXCESS WEAR

David J. Langton, +5 more

- 01 Jan 2010

- Journal of Bone and Joint Surgery-britis...

TL;DR: Surgeons must consider implant design, expected component size and acetabular component positioning in order to reduce early failures when performing large-bearing metal-on-metal hip resurfacing and replacement.

...read moreread less

785

Journal Article•10.1002/JBM.820271210

In vivo corrosion of modular hip prosthesis components in mixed and similar metal combinations. The effect of crevice, stress, motion, and alloy coupling

Jeremy L. Gilbert, +2 more

- 01 Dec 1993

- Journal of Biomedical Materials Research

TL;DR: It is hypothesized that the restricted crevice environment, coupled with high cyclic stresses which cause repeated fracture of the passive oxide films in the taper, result in an unstable electrochemical environment within the crevice for both the cobalt alloy and Ti-alloy passive films.

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650

Journal Article•10.1054/ARTH.2002.30286

Factors predisposing to dislocation after primary total hip arthroplasty: a multivariate analysis.

Brigitte M. Jolles, +2 more

- 01 Apr 2002

- Journal of Arthroplasty

TL;DR: The dislocation risk was 6.9 times higher if total anteversion was not between 40 degrees and 60 degrees and 10 times higher in patients with high ASA scores, and the ASA score should be part of the preoperative assessment of the dislocated risk.

...read moreread less

600

Journal Article•10.1097/00003086-200208000-00018

A multicenter retrieval study of the taper interfaces of modular hip prostheses.

Jay R. Goldberg, +5 more

- 01 Jan 2002

- Clinical Orthopaedics and Related Resear...

TL;DR: In vivo corrosion of modular hip taper interfaces is attributable to a mechanically-assisted crevice corrosion process and larger diameter necks will increase neck stiffness and may reduce fretting and subsequent corrosion of the taper interface regardless of the alloy used.

...read moreread less

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Assembly force and taper angle difference influence the relative motion at the stem–neck interface of bi-modular hip prostheses

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1. What are the contributions in "Assembly force and taper angle difference influence the relative motion at the stem–neck interface of bi-modular hip prostheses" ?

2. What are the future works mentioned in the paper "Assembly force and taper angle difference influence the relative motion at the stem–neck interface of bi-modular hip prostheses" ?

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Citations

Corrosion of the Head-Stem Taper Junction-Are We on the Verge of an Epidemic?: Review Article.

Micromotion at the head-stem taper junction of total hip prostheses is influenced by prosthesis design-, patient- and surgeon-related factors.

Effect of trunnion roughness and length on the modular taper junction strength under typical intraoperative assembly forces

Biomechanical Evaluation of the Fatigue Performance, the Taper Corrosion and the Metal Ion Release of a Dual Taper Hip Prosthesis under Physiological Environmental Conditions

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

References

Hip contact forces and gait patterns from routine activities.

Early failure of metal-on-metal bearings in hip resurfacing and large-diameter total hip replacement: A CONSEQUENCE OF EXCESS WEAR

In vivo corrosion of modular hip prosthesis components in mixed and similar metal combinations. The effect of crevice, stress, motion, and alloy coupling

Factors predisposing to dislocation after primary total hip arthroplasty: a multivariate analysis.

A multicenter retrieval study of the taper interfaces of modular hip prostheses.

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