In-vivo wear of hip surface replacements—a comparison of retrievals and simulator results

Morlock, Michael M.; Delling, G.; Rüther, W.; Hahn, Manuel; Bishop, Nick

doi:10.1016/s0021-9290(06)83384-1

Cited by 4 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is therefore unlikely that the wear rates in vivo will be as low as the steady state wear rates obtained in this study due to the increasing demands placed upon these implants by young active patients. Morlock et al highlighted the importance of cup angle with many of the higher wearing couples being implanted with an increased cup angle inducing rim loading 30. It is predicted that increasing the cup angle in a simulator study is also likely to result in elevated wear rates compared with those measured in this study, and this will be a focus of future studies.…”

Section: Discussionmentioning

confidence: 69%

“…Morlock et al highlighted the importance of cup angle with many of the higher wearing couples being implanted with an increased cup angle inducing rim loading. 30 It is predicted that increasing the cup angle in a simulator study is also likely to result in elevated wear rates compared with those measured in this study, and this will be a focus of future studies.…”

Section: Discussionmentioning

confidence: 71%

See 1 more Smart Citation

Effect of bearing size on the long‐term wear, wear debris, and ion levels of large diameter metal‐on‐metal hip replacements—An in vitro study

et al. 2008

View full text Add to dashboard Cite

Hip resurfacing arthroplasty has become a popular alternative to conventional hip surgery. Surface replacements with bearing sizes of 55 mm (n 5 5) and 39 mm (n 5 5) were tested in a hip simulator for 15 million cycles (Mc). Wear debris was isolated from the serum lubricant and characterized by field emmitting gun scanning electorn microscopy, and ion levels were measured via inductively coupled plasma mass spectroscopy at intervals throughout the test. The 39 mm bearings showed significantly greater bedding in volumetric wear (2.58 mm 3 ) compared with the 55 mm bearings (1.15 mm 3 ). There was no significant difference between the steady state wear rates (1-15 Mc) between the two sizes (0.10 and 0.09 mm 3 /Mc, respectively); however, this parity only became clear after 7 Mc. The wear debris isolated was oval in morphology with a mean particle size of 28 nm and a range of 9-108 nm. The Co levels measured at 0.13 Mc were significantly greater than at 3.6 Mc for both bearing sizes (10926 ppb and 176 ppb, respectively). After 0.5 Mc, the Co levels from the 39 mm bearings were significantly higher than the 55 mm (11,007 vs. 1475 ppb). The wear results support previous findings showing that increasing the femoral head size decreased volumetric bedding in wear. The ion levels measured suggest both bearing sizes have similar initial wear rates; however, the 55 mm bearings reach steady state wear more rapidly. '

show abstract

Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 71%

Effect of bearing size on the long‐term wear, wear debris, and ion levels of large diameter metal‐on‐metal hip replacements—An in vitro study

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Retrievals studies have changed our understanding of preclinical testing as some of the wear mechanisms observed on ceramic‐on‐ceramic and metal‐on‐metal bearings did not match wear mechanisms obtained under the standard walking simulator conditions . Retrieval studies have shown evidence of stripe wear and edge loading .…”

Section: Discussionmentioning

confidence: 99%

“…Retrievals studies have changed our understanding of preclinical testing as some of the wear mechanisms observed on ceramic-on-ceramic and metal-on-metal bearings did not match wear mechanisms obtained under the standard walking simulator conditions. 3,[23][24][25] Retrieval studies have shown evidence of stripe wear and edge loading. 5 Edge loading occurs when the wear patch or contact area between the head and the cup intersect with the acetabular rim due to either rotational or translational malpositioning.…”

Section: Discussionmentioning

confidence: 99%

Wear of composite ceramics in mixed‐material combinations in total hip replacement under adverse edge loading conditions

et al. 2016

View full text Add to dashboard Cite

Ceramic composites have performed very well under adverse edge loading conditions when used in like‐on‐like configurations, where the femoral head and acetabular cup are of the same material. The aim of this study was to determine the wear of pure alumina (Al2O3), alumina toughened zirconia (ATZ) and zirconia toughened alumina (ZTA) when used in mixed bearing combinations, under edge loading conditions due to translational mal‐positioning. The head‐on‐cup configurations of three ceramic materials were ATZ‐on‐ZTA, ZTA‐on‐ATZ, Al2O3‐on‐ATZ, ATZ‐on‐Al2O3, Al2O3‐on‐ZTA, and ZTA‐on‐Al2O3. They were tested on the Leeds II hip simulator under microseparation conditions. The bedding in and steady state wear rates of ATZ‐on‐ZTA were 1.16mm3/million cycles and 0.18mm3/million, respectively, and for ATZ‐on‐Al2O3 were 0.66 mm3/million cycles and 0.20 mm3/million, respectively. The wear rates of the other bearing combinations under these adverse microseparation conditions, Al2O3‐on‐ATZ, Al2O3‐on‐ZTA, ZTA‐on‐ATZ and ZTA‐on‐Al2O3 were very low with no clear bedding in and steady state phases, and with steady state wear rates lower than 0.11 mm3/million. The mixed material combinations tested in this study have shown slightly higher wear rates when compared to ATZ in like‐on‐like configuration reported previously, but superior wear resistance when compared to alumina‐on‐alumina bearings tested previously under the same adverse microseparation conditions. © 2016 The Authors Journal of Biomedical Materials Research Part B: Applied Biomaterials Published by Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 1361–1368, 2017.

show abstract

“…One such observation has been the presence of wear stripes on both ceramic-ceramic and metal-metal bearings [43,[113][114][115]. One such observation has been the presence of wear stripes on both ceramic-ceramic and metal-metal bearings [43,[113][114][115].…”

Section: Obm Developmentsmentioning

confidence: 99%

Tribological Assessment of UHMWPE in the Hip

Essner¹,

Wang²

2009

UHMWPE Biomaterials Handbook

View full text Add to dashboard Cite

In-vivo wear of hip surface replacements—a comparison of retrievals and simulator results

Cited by 4 publications

References 0 publications

Effect of bearing size on the long‐term wear, wear debris, and ion levels of large diameter metal‐on‐metal hip replacements—An in vitro study

Effect of bearing size on the long‐term wear, wear debris, and ion levels of large diameter metal‐on‐metal hip replacements—An in vitro study

Wear of composite ceramics in mixed‐material combinations in total hip replacement under adverse edge loading conditions

Tribological Assessment of UHMWPE in the Hip

Contact Info

Product

Resources

About