The initial stability and contact mechanics of a press-fit resurfacing arthroplasty of the hip

Udofia, I.; Liu, F.; Zhang, Jin; Roberts, Paul R.; Grigoris, P.

doi:10.1302/0301-620x.89b4.18055

Cited by 49 publications

(47 citation statements)

References 61 publications

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“…FE using commercial software has been extensively developed for contact mechanics of artificial joints 25, 26, 27, 28, 29, 30. Scifert et al29 developed a contact model to study factors that can influence hip dislocation; Elkin et al30, 31, 32 extended the model to investigate the effect of subluxation and impingement for MoM bearings and fracture for CoC implants; Mak et al18, 24 calculated contact stress for edge loading due to microsepartion in CoC hip joints; Sariali et al33 also carried out similar predictions for CoC bearings.…”

Section: Introductionmentioning

confidence: 99%

Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis

2014

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Some early failures of metal‐on‐metal (MoM) hip replacements associated with elevated wear have caused concerns for the use of this bearing combination. Simulator studies have shown that microseparation and its associated rim contact and edge loading may produce the most severe wear in MoM bearings. It is generally recognized that this high wear can be attributed to the high contact stress of the head on the rim of the cup. In this study, an improved finite element contact model that incorporates an elastic‐perfectly plastic material property for cobalt‐chrome alloy of the metal bearing was developed in an attempt to provide an accurate prediction of the stress and strain for the rim contact. The effects of the microseparation displacement (0.1−2 mm), cup inclination angle (25−65°) and cup rim radius (0.5−4 mm) on the contact stress/strain were investigated. The results show that a translational displacement >0.1 mm under a load >0.5 kN can produce a highly concentrated contact stress at the surface of the cup rim which can lead to plastic deformation. This study also suggests that the magnitude of translational displacement was the major factor that determined the severity of the contact conditions and level of stress and strain under microseparation conditions. Future studies will address the effect of surgical translational and rotational malposition and component design on the magnitude of microseparation, contact stress and strain and severity of wear. © 2014 The Authors. Journal of Biomedical Materials Research Part B: Applied Biomaterials Published by Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 103B: 1312–1319, 2015.

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Section: Introductionmentioning

confidence: 99%

Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis

2014

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“…However, there are still instances where simplified representations of the bone properties are implemented, e.g. FE simulations of the pelvis where only two materials are used to represent the cortical and cancellous bone (Zivkovic et al, 2010;Udofia et al, 2007). Models using idealised material properties may capture gross differences, but are unlikely to capture subtle variations and localised effects.…”

Section: Development Of a Representative Model With Appropriate Loadmentioning

confidence: 99%

“…Bone ingrowth/ ongrowth will occur if the micromotions are less than 40-50 μm and fibrous tissue formation will occur if the micromotions are in excess of 150 μm (Pilliar et al, 1986). FE has been extensively to analysis the primary stability of femoral stems (Tensi et al, 1989;Rohlmann et al, 1988; (Udofia et al, 2007;Spears et al, 2001;Janssen et al, 2010;Ries et al, 1997;Spears et al, 1999Spears et al, , 2000Ong et al, 2006;Bellini et al, 2007;Amirouche et al, 2008;Hothi et al, 2011Hothi et al, , 2012 and the tibial component of knee replacement Chong et al, 2010;Kelly et al, 2013;Taylor et al, 1998) since Rohlmann et al, 1988 first explored primary stability. A number of assumptions have become accepted and routinely implemented.…”

Section: Simulation Of the Initial Mechanical Environment Of The Bonementioning

confidence: 99%

“…However, larger interferences have been shown to induce high hoop stresses in the surrounding cancellous bone (Ramamurti et al, 1997) and in the femoral cortex (AbdulKadir et al, 2008). In comparison, larger interferences of up to 2 mm are routinely implemented in models of cementless acetabular cups (Zivkovic et al, 2010;Udofia et al, 2007;Bellini et al, 2007). The simplest way of implementing the interference is by uniformly offsetting the surface of the implant (Zivkovic et al, 2010;Udofia et al, 2007;Janssen et al, 2010) or by thermal expansion (Janssen et al, 2010;Bellini et al, 2007).…”

Section: Simulation Of the Initial Mechanical Environment Of The Bonementioning

confidence: 99%

“…The main focus of this review will be hip and knee replacement, as these have been studied the most, but the issues raised are applicable to the simulation of all orthopaedic devices. FE models have grown in both size and sophistication and techniques exist to assess the initial post-op mechanical environment Zivkovic et al, 2010;Chong et al, 2010;Pettersen et al, 2009;Reggiani et al, 2008;Udofia et al, 2007;Spears et al, 2001;Baldwin et al, 2008;Godest et al, 2002;Taylor and Barrett 2003;Perillo-Marcone and Taylor 2007;Chang et al, 2001) through to the simulation of time dependent processes including bone remodelling induced stress shielding (Huiskes et al, 1987;Perez et al, 2010;Behrens et al, 2009;Gillies et al, 2007;Taylor et al, 2004;McNamara et al, 1997;Weinans et al, 1994;Rietbergen et al, 1993;Gupta et al, 2006), tissue adaptation Andreykiv et al, 2005;Simmons et al, 2001), wear (Strickland et al, 2011;Strickland and Taylor 2009;Knight et al, 2007;Fregly et al, 2005;Bevill et al, 2005;Teoh et al, 2002;Brown et al, 2002;Maxian et al, 1996;Pal et al, 2008), damage accumulation of the cement mantle (Coultrup et al, 2010;Janssen et al, 2009;Lennon et al, 2007;Jeffers et al, 2007;Janssen et al, 2006;…”

Section: Introductionmentioning

confidence: 99%

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Four decades of finite element analysis of orthopaedic devices: Where are we now and what are the opportunities?

Taylor

Prendergast

2015

Journal of Biomechanics

147

106

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a b s t r a c tFinite element has been used for more than four decades to study and evaluate the mechanical behaviour total joint replacements. In Huiskes seminal paper "Failed innovation in total hip replacement: diagnosis and proposals for a cure", finite element modelling was one of the potential cures to avoid poorly performing designs reaching the market place. The size and sophistication of models has increased significantly since that paper and a range of techniques are available from predicting the initial mechanical environment through to advanced adaptive simulations including bone adaptation, tissue differentiation, damage accumulation and wear. However, are we any closer to FE becoming an effective screening tool for new devices? This review contains a critical analysis of currently available finite element modelling techniques including (i) development of the basic model, the application of appropriate material properties, loading and boundary conditions, (ii) describing the initial mechanical environment of the bone-implant system, (iii) capturing the time dependent behaviour in adaptive simulations, (iv) the design and implementation of computer based experiments and (v) determining suitable performance metrics.The development of the underlying tools and techniques appears to have plateaued and further advances appear to be limited either by a lack of data to populate the models or the need to better understand the fundamentals of the mechanical and biological processes. There has been progress in the design of computer based experiments. Historically, FE has been used in a similar way to in vitro tests, by running only a limited set of analyses, typically of a single bone segment or joint under idealised conditions. The power of finite element is the ability to run multiple simulations and explore the performance of a device under a variety of conditions. There has been increasing usage of design of experiments, probabilistic techniques and more recently population based modelling to account for patient and surgical variability. In order to have effective screening methods, we need to continue to develop these approaches to examine the behaviour and performance of total joint replacements and benchmark them for devices with known clinical performance.Finite element will increasingly be used in the design, development and pre-clinical testing of total joint replacements. However, simulations must include holistic, closely corroborated, multi-domain analyses which account for real world variability.

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Micromotion analysis of immediately loaded implants with Titanium and Cobalt‐Chrome superstructures. 3D finite element analysis

Tobar-Reyes

Andueza-Castro

Jiménez-Silva

et al. 2021

Clinical & Exp Dental Res

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Objective: The aim of this study was to evaluate the amount of micromotion of dental implants under immediate loading supported by Titanium (Ti) and Cobalt-Chrome (Co-Cr) superstructures. Material and methods:A model of tridimensional half-edentulous maxilla with three dental implants was made using the Finite Element Analysis (FEA). Two standard and one zygomatic implants were connected to a superstructure with an elliptic section of 6x 3 mm (mm). Two study models were established. Model A: Titanium (Ti) alloy superstructure; Model B: Cobalt-Chrome (Co-Cr) alloy superstructure. To simulate an immediate-loading situation, a friction coefficient of 0.71 was applied between the implant and the bone surface. An axial load of 252.04 [N] was applied on standard and zygomatic implants.Results: The Micromotion of dental implants was similar in both superstructure situations. The amount of micromotion was slightly higher in B1 and B3 models (Co-Cr alloy-superstructure) compared with A1 and A3 models (Titanium alloy superstructure). The micromotion values in two groups were greater than 150 μm in the incisive region (standard implant) and molar region (zygomatic). In general, the micromotion was higher on the implant that received the load with respect to the other implants.The greater difference was observed when the load was applied on the standard implant A1 (Model A1 = 189.12 μm) compared with standard implant B1(Model B1 = 263.25 μm).Conclusions: Within the limits of present study, all implants on different load application points showed micromotion; in general, the amount of micromotion was slightly higher in the implants connected with Co-Cr alloy superstructure.

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The initial stability and contact mechanics of a press-fit resurfacing arthroplasty of the hip

Cited by 49 publications

References 61 publications

Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis

Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis

Four decades of finite element analysis of orthopaedic devices: Where are we now and what are the opportunities?

Micromotion analysis of immediately loaded implants with Titanium and Cobalt‐Chrome superstructures. 3D finite element analysis

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