An improved method of computing the wear factor for total hip prostheses involving the variation of relative motion and contact pressure with location on the bearing surface

Saikko, Vesa; Calonius, Olof

doi:10.1016/s0021-9290(03)00228-8

Cited by 23 publications

(22 citation statements)

References 20 publications

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“…The constant values F max and F 0 are computed so as to obtain, for hight frequency (f = 100Hz), the resulting contact force, plotted in Figure 3, consistent with that reported in Saikko [26] (continuous line of Figure 7). …”

Section: Load Conditionssupporting

confidence: 75%

“…For an amplification factor n = 10 6 , we use the boundary load function plotted with dashed line in Figure 3 so as to have a resulting contact force consistent with that reported in Saikko [26] (continuous line of Figure 7). With these boundary conditions, the computed wear rate is about 18.88 mm 3 /10 6 cycles and the worn area is consistent with experimental observations (see Figure 8).…”

Section: Resultsmentioning

confidence: 99%

“…This is due to the kinematics that we imposed on the femoral head. We chose a head movement close the physiological kinematics, while Saikko's tests [26] were conducted on a hip simulator, which is different. In the paper [25], tracks made by contact points were compared between * It should also be noted that to achieve satisfactory results, we used a wear factor approximately twofold higher than that proposed by [11].…”

Section: Discussionmentioning

confidence: 99%

“…The first is mentioned in the preceding paragraph, i.e. it is an average of the values found by Saikko [26] and its work is our experimental reference study. The second reason, which is physical evidence, is that many studies have shown that a change of direction of friction is an aggravating factor for wear (see [19], [29]).…”

Section: Discussionmentioning

confidence: 99%

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An implicit numerical method for wear modeling applied to a hip joint prosthesis problem

Jourdan¹,

Samida²

2009

Computer Methods in Applied Mechanics and Engineering

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Some phenomenological wear models exist, but they are most of the time used to post-process numerical simulations. In certain situations however, material loss may be sufficient to change the contact area, contact stresses. In such cases, coupling the wear loss estimation to the mechanical contact modelling becomes essential. It can be done, and is done most of the time, by updating geometry between time-

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Section: Load Conditionssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

An implicit numerical method for wear modeling applied to a hip joint prosthesis problem

Jourdan¹,

Samida²

2009

Computer Methods in Applied Mechanics and Engineering

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“…In earlier studies, Saikko and Calonius presented the first verified computations of the kinematics of the prosthetic hip joint illustrated as so-called slide track patterns [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of contact pressure on wear and friction of ultra-high molecular weight polyethylene in multidirectional sliding

Saikko¹

2006

Proc Inst Mech Eng H

123

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Please cite the original version: Saikko, Vesa. 2006 All material supplied via Aaltodoc is protected by copyright and other intellectual property rights, and duplication or sale of all or part of any of the repository collections is not permitted, except that material may be duplicated by you for your research use or educational purposes in electronic or print form. You must obtain permission for any other use. Electronic or print copies may not be offered, whether for sale or otherwise to anyone who is not an authorised user. ABSTRACTComputational wear models need input data from valid tribological tests. For the wear model of total hip prosthesis, the contact pressure dependence of wear and friction of ultra-high molecular weight polyethylene (UHMWPE) against polished CoCr in diluted calf serum lubricant was studied, and useful input data produced. Two test devices were designed and built, heavy load circularly translating pin-on-disk (HL-CTPOD) wear test device and HL-CTPOD friction measurement device. Both can be used with a wide range of loads. The wear surface diameter of the test pin was kept constant, 9 mm, whereas the load was varied so that the nominal contact pressure ranged from 0.1 MPa to 20 MPa. The wear factor decreased with increasing contact pressure, whereas the coefficient of friction first increased with increasing contact pressure with low pressure values, and then decreased. Up to the pressure of 2.0 MPa, the wear mechanisms and wear factors were in good agreement with clinical findings. In the critical range of 2.0-3.5 MPa, the wear mechanisms and wear factors started to differ from clinical ones, and the decrease of the wear factor steepened. The discrepancy became more and more evident as the pressure was gradually increased beyond 3.5 MPa. It appears that the pressure value of 2.0 MPa should not be exceeded in pin-on-disk wear tests that are to reproduce the clinical wear of UHMWPE acetabular cups.

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Shape Deviations of the Contact Areas of the Total Hip Replacement

Fuis

Koukal²,

Florian³

2011

Mechatronics

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An improved method of computing the wear factor for total hip prostheses involving the variation of relative motion and contact pressure with location on the bearing surface

Cited by 23 publications

References 20 publications

An implicit numerical method for wear modeling applied to a hip joint prosthesis problem

An implicit numerical method for wear modeling applied to a hip joint prosthesis problem

Effect of contact pressure on wear and friction of ultra-high molecular weight polyethylene in multidirectional sliding

Shape Deviations of the Contact Areas of the Total Hip Replacement

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