A multidirectional motion pin-on-disk wear test method for prosthetic joint materials

Saikko, Vesa

doi:10.1002/(sici)1097-4636(199807)41:1<58::aid-jbm7>3.0.co;2-p

Cited by 112 publications

(66 citation statements)

References 20 publications

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“…in the case of course 1, the wear depth obtained equals 0.16756 mm, which clearly differs from all the other values in the table. Once the model modified-cycle is increased, the wear depth will converge to 0.13716 mm, which is in significant agreement with the wear depth of 0.13 mm for one million sliding cycles given by Saikko [25]. It indicates that the proper designated number of cycles to modify the wear model is necessary in the computer simulation.…”

Section: Computational Processessupporting

confidence: 82%

“…The acetabular cup is made of UHMWPE with an interior diameter of 22 mm and an outer diameter of 50 mm. The wear coefficient at the interface between hip joint and acetabular cup is 0.8× 10 − 6 mm 3 /Nm, which is the same as that used by Saikko [25] and within the range declared in most studies [9,26]. Other material properties are described in Section 3.2.1.…”

Section: The Artificial Hip Joint Modelmentioning

confidence: 81%

“…In 1997, Saikko [25] studied wear rates and wear mechanism of retrieved polyethylene acetabular cups by experimental methods. In Saikko's investigation, a circularly translating pin-on-disk (CTPOD) sliding system was made.…”

Section: The Pin-on-disk Modelmentioning

confidence: 99%

“…Therefore, forces acting on hip joints are varied in magnitude with time during the gait period and can be referred to a dynamic loading. Saikko [25] measured the load history for each gait cycle by a five-station hip joint simulator and declared the maximum force is 3.5 kN and the swing angle is 23°in the forward and backward directions for flexion/extension actions for each gait [14,15]. Here, we divide Saikko's gait cycle into 16 load stages and the force acting on the hip joint for each stage may be obtained (Fig.…”

Section: The Artificial Hip Joint Modelmentioning

confidence: 99%

“…Based on Saikko's experiment [25], an analogous pin-on-disk plate model, under a force of 70.7 Newtons sliding for one million cycles, was made from hexahedron brick elements for the assessment of validity of the current algorithm.…”

Section: Assessment Of 6alidity From the Pin-on-disk Modelmentioning

confidence: 99%

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The computer simulation of wear behavior appearing in total hip prosthesis

Hung

Shu

et al. 2003

Computer Methods and Programs in Biomedicine

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Computer algorithms are proposed for the estimation of wear appearing in artificial hip joints using finite element analysis based on the modified Archard's wear law, contact features and an analogue wear process. A pin-on-disk plate experiment is reconstructed to assess the efficiency and validity of the algorithms proposed here. Through the successful verification of wear depth and volume loss of the pin-on-disk plate as well as the artificial hip joint, the current algorithms provide significant agreement with experiments, clinical measurements and numerical calculations and are shown to be both valid and feasible. Further investigation into the effect of femoral heads with various sizes suggests that the larger femoral head may induce larger wear volume but gives a smaller wear depth and that wear depth and volume loss are apparently nonlinearly related to the femoral head diameter. It is shown that the current algorithms are useful and helpful in understanding wear behavior for alternative or new designs of artificial hip joints and even for other analogous structures.

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Section: Computational Processessupporting

confidence: 82%

Section: The Artificial Hip Joint Modelmentioning

confidence: 81%

Section: The Pin-on-disk Modelmentioning

confidence: 99%

Section: The Artificial Hip Joint Modelmentioning

confidence: 99%

Section: Assessment Of 6alidity From the Pin-on-disk Modelmentioning

confidence: 99%

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The computer simulation of wear behavior appearing in total hip prosthesis

Hung

Shu

et al. 2003

Computer Methods and Programs in Biomedicine

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Wear simulation of UHMWPE for total hip replacement with a multidirectional motion pin-on-disk device: Effects of counterface material, contact area, and lubricant

Saikko¹,

Ahlroos²

2000

J. Biomed. Mater. Res.

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The wear of nonirradiated ultra-high molecular weight polyethylene (UHMWPE) was studied with a circularly translating pin-on-disk (CTPOD) device. With this simple device, the wear of the acetabular cup is simulated. Two shapes of a polyethylene pin were used: flat wear faces of 3.0 and 8.9 mm in diameter. The load was always 70.7 N. Tests were done against stainless steel plates in serum, albumin, and gamma-globulin lubricants and against alumina plates in serum. With 3.0-mm-in-diameter wear faces, the wear factors were an order of magnitude lower than the average clinical wear factors of polyethylene acetabular cups. With 8.9-mm-in-diameter wear faces, the wear factors and wear mechanisms were consistent with clinical ones. The mean wear factor against stainless steel in serum was 1.46 times higher than that against alumina, and the difference was statistically significant. The mean wear factors in albumin and gamma globulin were close to that in serum; the differences were not statistically significant. The results indicate that albumin and gamma globulin are the fractions of synovia that influence the wear of polyethylene. A practical test parameter combination for the CTPOD device has now been established for future studies of modified and new materials and of lubricants.

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Effect of counterface roughness on the wear of conventional and crosslinked ultrahigh molecular weight polyethylene studied with a multi-directional motion pin-on-disk device

Saikko¹,

Calonius²,

Keränen

2001

J. Biomed. Mater. Res.

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The effect of counterface roughness on the wear of conventional gamma-sterilized, and electron-beam-crosslinked ultrahigh molecular weight polyethylene was studied with a circularly translating pin-on-disk device. The counterfaces, CoCr disks, were either polished, or roughened so that they represented the type of roughening and the range of surface roughness values (R(a) = 0.014-0.24 microm) observed in explanted femoral heads of total hip prostheses. The lubricant was diluted calf serum, and the test length 3 million cycles. A total of 24 tests were done. With both types of polyethylene, there was a strong correlation between R(a) and wear factor k. The power equations were k = 5.87 x 10(-5)(R(a))(0.91) for conventional polyethylene (R(2) = 0.94), and k = 7.87 x 10(-5)(R(a))(2.49) for crosslinked polyethylene (R(2) = 0.82). Crosslinking improved wear resistance significantly. The wear of crosslinked polyethylene against the roughest counterfaces was lower than the wear of conventional polyethylene against the polished counterfaces. Against rough counterfaces, the wear of crosslinked polyethylene was an order of magnitude lower than that of conventional polyethylene. On the crosslinked polyethylene pins that were tested against polished counterfaces, remains of original machining marks were still visible after the test. The average size of wear particles produced by both types of polyethylene against rough counterfaces was similar, 0.4 microm, whereas that produced by conventional and crosslinked polyethylene against polished counterfaces was significantly smaller, 0.2 and 0.1 microm, respectively.

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A multidirectional motion pin-on-disk wear test method for prosthetic joint materials

Cited by 112 publications

References 20 publications

The computer simulation of wear behavior appearing in total hip prosthesis

The computer simulation of wear behavior appearing in total hip prosthesis

Wear simulation of UHMWPE for total hip replacement with a multidirectional motion pin-on-disk device: Effects of counterface material, contact area, and lubricant

Effect of counterface roughness on the wear of conventional and crosslinked ultrahigh molecular weight polyethylene studied with a multi-directional motion pin-on-disk device

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