The effect of clearance and wear on the contact pressure of metal on polyethylene hip prostheses

Tudor, Anca; Laurian, Tiberiu; Popescu, V.M.

doi:10.1016/j.triboint.2012.11.002

Cited by 22 publications

(11 citation statements)

References 22 publications

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“…As stated by Teoh et al [ 37 ] the radial clearance plays a vital role in the wear process, finding that its extreme values (0.001 and 0.5 mm) led to the highest level of wear. In the study by Tudor et al [ 43 ] the difference between the conditions of small loads with high clearances is highlighted, where the contact pressure tends to a Hertzian distribution, and high loads with small clearances, where the contact pressure tends to have a hyperbolic distribution. Furthermore, concerning the influence of the frictional force, in the study by Teoh et al [ 37 ] they found that varying the friction coefficient between 0 and 0.3, only yielded a slightly variance of the wear rate.…”

Section: Discussionmentioning

confidence: 99%

Finite Element Simulations of Hard-On-Soft Hip Joint Prosthesis Accounting for Dynamic Loads Calculated from a Musculoskeletal Model during Walking

2018

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The hip joint replacement is one of the most successful orthopedic surgical procedures although it involves challenges to overcome. The patient group undergoing total hip arthroplasty now includes younger and more active patients who require a broad range of motion and a longer service lifetime for the replacement joint. It is well known that wear tests have a long duration and they are very expensive, thus studying the effects of geometry, loading, or alignment perturbations may be performed by Finite Element Analysis. The aim of the study was to evaluate total deformation and stress intensity on ultra-high molecular weight polyethylene liner coupled with hard material head during one step. Moving toward in-silico wear assessment of implants, in the presented simulations we used a musculoskeletal multibody model of a human body giving the loading and relative kinematic of the investigated tribo-system during the gait. The analysis compared two frictional conditions -dry and wet and two geometrical cases- with and without radial clearance. The loads and rotations followed the variability of the gait cycle as well as stress/strain acting in the UHWMPE cup. The obtained results allowed collection of the complete stress/strain description of the polyethylene cup during the gait and calculation of the maximum contact pressure on the lateral edge of the insert. The tensional state resulted in being more influenced by the geometrical conditions in terms of radial clearance than by the variation of the friction coefficients due to lubrication phenomena.

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Section: Discussionmentioning

confidence: 99%

Finite Element Simulations of Hard-On-Soft Hip Joint Prosthesis Accounting for Dynamic Loads Calculated from a Musculoskeletal Model during Walking

2018

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“…al [ 31 ] demonstrated that relatively greater distances between articulating surfaces results in greater contact pressures on the polar region than the equatorial region. Conversely, relatively smaller distances between articulating surfaces have demonstrated greater contact pressure applied in the equatorial region of the implant than the polar region [ 31 ]. The differential contact pressures of the two areas could aid in explaining the difference in incidence of coating loss between polar and equatorial regions.…”

Section: Discussionmentioning

confidence: 99%

Retrieval analysis of ceramic-coated metal-on-polyethylene total hip replacements

Khatkar

Hothi

Villiers

et al. 2016

International Orthopaedics (SICOT)

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“…The resulting equations (equation 23) are nonlinear and can be solved utilizing a numerical method. In this study, the adaptive Runge-Kutta-Fehlberg method is employed to integrate equation (23) in time. 66…”

Section: Dynamic Governing Equations Of the Systemmentioning

confidence: 99%

“…The computational method was stable and solutions to the equations are always achieved. In the next section, the results of solutions for equation (23) for artificial hip joints will be presented and discussed.…”

Section: Validationmentioning

confidence: 99%

“…Using this elasticity model, Jin et al 22 conducted a parametric study to explore an optimal design of hip implant to reduce maximum stresses. Tudor et al 23 developed an elasticity model based on Hill theory and used Erdogan’s solution to form a compliance matrix based on which contact stresses can be calculated iteratively. The most widespread approach for solving contact problems is the FEM as it can deal with complex geometries and complex material behaviors and is implemented in commercial codes.…”

Section: Introductionmentioning

confidence: 99%

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A closed-form formulation for the conformal articulation of metal-on-polyethylene hip prostheses: Contact mechanics and sliding distance

Askari

Andersen

2018

Proc Inst Mech Eng H

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Using Hertz contact law results in inaccurate outcomes when applied to the soft conformal hip implants. The finite element method also involves huge computational time and power. In addition, the sliding distance computed using the Euler rotation method does not incorporate tribology of bearing surfaces, contact mechanics and inertia forces. The present study therefore aimed to develop a nonlinear dynamic model based on multibody dynamic methodology to predict contact pressure and sliding distance of metal-on-polyethylene hip prosthesis, simultaneously, under normal walking condition. A closed-form formulation of the contact stresses distributed over the articulating surfaces was derived based upon the elastic foundation model, which reduced computational time and cost significantly. Three-dimensional physiological loading and motions, inertia forces due to hip motion and energy loss during contact were incorporated to obtain contact properties and sliding distance. Comparing the outcomes with that available in the literature and a finite element analysis allowed for the validation of our approach. Contours of contact stresses and accumulated sliding distances at different instants of the walking gait cycle were investigated and discussed. It was shown that the contact point at each instant was located within the zone with the corresponding highest accumulated sliding distance. In addition, the maximum contact pressure and area took place at the stance phase with single support. The stress distribution onto the cup surface also conformed to the contact point trajectory and the physiological loading.

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The effect of clearance and wear on the contact pressure of metal on polyethylene hip prostheses

Cited by 22 publications

References 22 publications

Finite Element Simulations of Hard-On-Soft Hip Joint Prosthesis Accounting for Dynamic Loads Calculated from a Musculoskeletal Model during Walking

Finite Element Simulations of Hard-On-Soft Hip Joint Prosthesis Accounting for Dynamic Loads Calculated from a Musculoskeletal Model during Walking

Retrieval analysis of ceramic-coated metal-on-polyethylene total hip replacements

A closed-form formulation for the conformal articulation of metal-on-polyethylene hip prostheses: Contact mechanics and sliding distance

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