Preliminary study of the effect of aging following irradiation on the wear of ultrahigh-molecular-weight polyethylene

Fisher, John; Chan, Kook; Hailey, J L; Shaw, Dein; Stone, Martin

doi:10.1016/s0883-5403(05)80217-7

Cited by 68 publications

(22 citation statements)

References 7 publications

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“…Other factors that have been associated with increased polyethylene wear, such as machined polyethylene inlays (Bankston et al 1995b), cementless fixation (Hemandez et al 1994) and ageing following gamma irradiation , Fisher et al 1995, Sutula et al 1995, may also have contributed to the polyethylene wear in our hips. We found no significant associations between wear and parameters like gender, age and body weight, which have been demonstrated by others (Griffith et al 1978, Kim and Kim 1993, Berry et al 1994, Bono et al 1994, Callaghan et al 1995, Nashed et al 1995, Woolson and Murphy 1995.…”

Section: Discussionmentioning

confidence: 92%

Polyethylene wear with an entirely HA-coated total hip replacement 79 hips followed for 5 years

Røkkum¹,

Reigstad²

1998

Acta Orthopaedica Scandinavica

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We measured the eccentricity of the femoral head in the metal backing annually during 5 years in 79 consecutive total hip replacements (73 patients). The mean age of the patients was 57 (32-73) years and the female/male ratio 63/22. The prostheses were entirely coated with hydroxyapatite. Modular 32 mm stainless steel heads and hemispherical, self-tapping screw cups with polyethylene liners were used.We found accelerating eccentricity throughout the observation period. The mean eccentricity at 5 years was 0.71 mm (95% CI 0.53-0.90), resulting in a mean eccentricity rate of 0 . 1 4 mm (0.1 14.1 8) per year. The 5-year eccentricity was 0.5 mm or less in 45 hips and more than 1.5 mm in 13 hips, 2 in the latter group apparently having worn through the polyethylene liner. The true wear may be twice as great.The use of 32 mm stainless steel heads and thin polyethylene inlays may have aggravated the wear problems. These HA-coated prostheses must all be checked regularly, so that cases with excessive polyethylene wear can be reoperated on before wear-through of the liner.Senter for Ortopedi, Rikshospitalet, Trondheimsveien 132,

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Section: Discussionmentioning

confidence: 92%

Polyethylene wear with an entirely HA-coated total hip replacement 79 hips followed for 5 years

Røkkum¹,

Reigstad²

1998

Acta Orthopaedica Scandinavica

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“…The modular polyethylene liner had been machined from extruded bar raw material and gamma-sterilized in air. Some authors (Fisher et al 1995, Bohl et al 1999) have reported substantial changes in the structure of PE following gamma-irradiation sterilization in air and several years ageing. The quality of the liner material has been shown to vary significantly (Tanner et al 1995) which could explain why some liners did not show any measurable wear.…”

Section: Discussionmentioning

confidence: 99%

Alarming wear of the first-generation polyethylene liner of the cementless porous-coated Biomet Universal cup: 107 hips followed for mean 6 years

Puolakka¹,

Laine²,

Moilanen³

et al. 2001

Acta Orthopaedica Scandinavica

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Wear of the socket liner and resulting osteolysis are the major causes of failure in cementless hip arthroplasties. We report alarming wear of the first-generation polyethylene liner of the cementless porous-coated Biomet Universal cup. Radiographs of 107 primary hip arthroplasties were analyzed retrospectively. The mean follow-up time was 74 (47-91) months. The linear wear of the polyethylene liners was assessed using a modification of the Livermore method. The median linear wear was 1.0 (0-6.2) and the median linear wear rate was 0.17 mm/year. There was a statistically significant difference between the 28 mm and 32 mm femoral head groups both in the volumetric wear and in the volumetric wear rate. The median linear wear was 0.28 mm/year and 0.14 mm/year for the 32 mm and 28 mm heads, respectively. So far, 14 revisions have been performed or have been scheduled because of excessive wear of the polyethylene liner. In regression analysis, the factors related to the wear rate were the 32 mm size of the femoral head and screw fixation of acetabular shell. We found that the cases with calcar rounding were associated with significantly greater wear. Possible reasons for increased wear of the Hexloc liner may be the cylindrical design, thin polyethylene, and poor quality of the polyethylene. Regular clinical and radiographic follow-ups are recommended especially for hips with 32 mm femoral heads or with screw fixation. If progressive wear of the liner is observed, revision must be considered.

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“…Between 0 and 2, and 6 and 8 million cycles the testing frequency was 1 Hz, whereas it was 2 Hz between 2 and 6, and 8 and 12 million cycles Components were packaged using barrier packaging materials and maintained in a nitrogen environment prior to testing. Previous studies have shown that gamma irradiation in air (oxygen) can adversely affect the mechanical properties and the wear behaviour of polyethylene due to oxidative degradation, especially components that remain on the shelf for extended periods of time [4]. In contrast, components irradiated in an inert atmosphere have shown to maintain their mechanical and wear properties for up to 10 years of shelf ageing.…”

Section: Discussionmentioning

confidence: 99%

Influence of the loading frequency on the wear rate of a polyethylene-on-metal lumbar intervertebral disc replacement

Kettler¹,

Bushelow²,

Wilke³

2010

Eur Spine J

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Pre-clinical wear testing of intervertebral disc prostheses is commonly carried out according to ISO 18192-1. Ten million multiaxial loading cycles are applied at a frequency of 1 Hz. At this frequency, testing takes about 4 months. Testing at higher frequencies would therefore be desirable. ISO 18192-1 also offers testing at 2 Hz; however, it says the impact on the implant material behaviour as well as on the accuracy of the test machine shall be investigated by the user. Since such data are not available so far, the aim of this study was to carry out comparative wear tests at 1 and 2 Hz. Seven Prodisc-L lumbar disc prostheses were tested. After a pre-soak period, the implants were placed in specimen cups filled with calf serum, mounted to a Spine Wear Simulator and loaded according to ISO 18192-1. Testing was carried out at a temperature of 37 ± 2 °C. Four million loading cycles were applied at 1 Hz and eight million at 2 Hz in an alternating sequence. Each time after 12 days of testing the implants were removed to measure the weight and the height of the polyethylene cores. Then, the test serum was exchanged and the implants were remounted to the testing machine. The mean wear rate was 5.6 ± 2.3 mg per million cycles at 1 Hz and 7.7 ± 1.6 mg per million cycles at 2 Hz during the first six million loading cycles (p < 0.05) and 2.0 ± 0.6 and 4.1 ± 0.7 mg per million cycles during the second six million cycles (p < 0.05). Similarly, the mean heightloss was also smaller at 1 Hz than at 2 Hz (p < 0.05) with -0.02 ± 0.02 mm versus -0.04 ± 0.02 mm per million cycles during the first half of testing and -0.01 ± 0.01 versus -0.02 ± 0.01 mm per million cycles during the second half. The accuracy of the test machine was within the limits described by ISO 18192-1 at both frequencies. The results showed that the wear rate was higher at the beginning than at the end of testing. Also, the results indicated that testing at 2 Hz increases the wear rate compared with 1 Hz in case of a polyethylene-on-metal implant design. In the absence of retrieval studies it is difficult to decide which rate results in a more physiological wear pattern. However, a loading frequency of 1 Hz is probably closer to physiology than 2 Hz since the loading amplitudes prescribed by ISO 18192-1 are high. They rather represent movements like tying shoes or standing up from a chair than walking or sitting. The authors therefore suggest testing at 1 Hz.

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Preliminary study of the effect of aging following irradiation on the wear of ultrahigh-molecular-weight polyethylene

Cited by 68 publications

References 7 publications

Polyethylene wear with an entirely HA-coated total hip replacement 79 hips followed for 5 years

Polyethylene wear with an entirely HA-coated total hip replacement 79 hips followed for 5 years

Alarming wear of the first-generation polyethylene liner of the cementless porous-coated Biomet Universal cup: 107 hips followed for mean 6 years

Influence of the loading frequency on the wear rate of a polyethylene-on-metal lumbar intervertebral disc replacement

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