An elasto-plastic finite element model for polyethylene wear in total hip arthroplasty

Teoh, Swee Hin; Chan, Woei-leong; Thampuran, R.

doi:10.1016/s0021-9290(01)00215-9

Cited by 127 publications

(121 citation statements)

References 23 publications

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“…Hence, k must be updated, say, 100 times during the cycle according to the variation of the contact pressure with time and with location on the bearing surface. Computer models of the acetabular cup wear developed so far [26][27][28][29] are deficient in the sense that they omit the slide track shape. They involve the sliding distance only, as if the multidirectionality of the motion did not affect the wear at all.…”

Section: Discussionmentioning

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

126

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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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Section: Discussionmentioning

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

126

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“…It was only in this area that fractures of the threaded cups were found. This region constitutes the main direction of the transmission of force into the pelvis [9,15]. Owing to the inadequate backing mentioned previously, the maximum stress of the implants regarding their dynamic strength was exceeded as a result of compressive and tensile stress, which subsequently might result in fracture of the prosthesis.…”

Section: Discussionmentioning

confidence: 97%

Case Reports: Fractures of Threaded Cups: Rare Complications of a Well-established Implant

Hoburg

Mehta

Tohtz

et al. 2009

Clinical Orthopaedics &Amp; Related Research

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The use of cementless threaded cups in THA is a well-established treatment. Fractures of the cups are rare complications recorded in individual cases with material defects being discussed as the primary cause. We analyzed three cases of fractured cups. Although all three cups were well fixed to existing bone, we observed deficient osseous backing dorsocranially and abrasion particles. There were no signs of femoroacetabular impingement or infection. The cups showed corrosion debris. Scanning electron microscopic investigations showed characteristics of fretting and fretting-related corrosion. We concluded the fractures occurred because of fretting combined with inadequate bony support leading to fatigue of the material and subsequent fracture.

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“…The maximum shear stress in polyethylene acetabular components occurs very close to the articulating surface and this fact has not yet been directly linked to the wear seen in these components. (Teoh 2002) …”

Section: Minimizing Contact Stressmentioning

confidence: 99%

The Bearing Surfaces in Total Hip Arthroplasty – Options, Material Characteristics and Selection

Hosseinzadeh¹,

Eajazi²,

Shahi³

2012

Recent Advances in Arthroplasty

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An elasto-plastic finite element model for polyethylene wear in total hip arthroplasty

Cited by 127 publications

References 23 publications

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

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

Case Reports: Fractures of Threaded Cups: Rare Complications of a Well-established Implant

The Bearing Surfaces in Total Hip Arthroplasty – Options, Material Characteristics and Selection

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