Pitch-based carbon-fibre-reinforced poly (ether-ether-ketone) OPTIMA assessed as a bearing material in a mobile bearing uniconylar knee joint.

Scholes, SC; Unsworth, A

doi:10.1243/09544119jeim471

Physical joint simulators, Editorial for Special Issue (2016)
Journal Article
Dowson, D., & Unsworth, A. (2016). Physical joint simulators, Editorial for Special Issue. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 230(5), 345-346. https://doi.org/10.1177/0954411916642073

Some aspects of friction measurements in hip joint simulators (2016)
Journal Article
Unsworth, A. (2016). Some aspects of friction measurements in hip joint simulators. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 230(5), 359-365. https://doi.org/10.1177/0954411916637382

The measurement of friction in artificial hip joints can lead to the knowledge of the lubrication mechanisms occurring in the joints. However, the measurement of friction, particularly in spherical contacts, is not always straightforward. The importa... Read More about Some aspects of friction measurements in hip joint simulators.

In vitro wear testing of the PyroCarbon proximal interphalangeal joint replacement: Five million cycles of flexion and extension. (2015)
Journal Article
Naylor, A., Bone, M. C., Unsworth, A., Talwalkar, S. C., Trail, I. A., & Joyce, T. J. (2015). In vitro wear testing of the PyroCarbon proximal interphalangeal joint replacement: Five million cycles of flexion and extension. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 229(5), 362-368. https://doi.org/10.1177/0954411915581410

Clinical results of the PyroCarbon proximal interphalangeal joint replacement are inconsistent with various complications reported. To address this, in vitro testing was conducted using finger joint simulators. Two PyroCarbon proximal interphalangeal... Read More about In vitro wear testing of the PyroCarbon proximal interphalangeal joint replacement: Five million cycles of flexion and extension..

Wear of PEEK-OPTIMA and PEEK-OPTIMA-Wear Performance articulating against highly cross-linked polyethylene (2015)
Journal Article
East, R. H., Briscoe, A., & Unsworth, A. (2015). Wear of PEEK-OPTIMA and PEEK-OPTIMA-Wear Performance articulating against highly cross-linked polyethylene. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 229(3), 187-193. https://doi.org/10.1177/0954411915576353

The idea of all polymer artificial joints, particularly for the knee and finger, has been raised several times in the past 20 years. This is partly because of weight but also to reduce stress shielding in the bone when stiffer materials such as metal... Read More about Wear of PEEK-OPTIMA and PEEK-OPTIMA-Wear Performance articulating against highly cross-linked polyethylene.

The effect of tranexamic acid on artificial joint materials : a biomechanical study (the bioTRANX study) (2014)
Journal Article
Alshryda, S., Mason, J., Sarda, P., Lou, T., Stanley, M., Wu, J., & Unsworth, A. (2015). The effect of tranexamic acid on artificial joint materials : a biomechanical study (the bioTRANX study). Journal of Orthopaedics and Traumatology, 16(1), 27-34. https://doi.org/10.1007/s10195-014-0312-0

Background Tranexamic acid (TXA) has been successfully used to reduce bleeding in joint replacement. Recently local TXA has been advocated to reduce blood loss in total knee or hip replacement; however, this raised concerns about potential adverse ef... Read More about The effect of tranexamic acid on artificial joint materials : a biomechanical study (the bioTRANX study).

The influence of nominal stress on wear factors of carbon-fibre reinforced polyetheretherketone (PEEK-OPTIMA Wear Performance) against zirconia toughened alumina (Biolox delta ceramic) (2014)
Journal Article
Evans, A., Horton, H., Unsworth, A., & Briscoe, A. (in press). The influence of nominal stress on wear factors of carbon-fibre reinforced polyetheretherketone (PEEK-OPTIMA Wear Performance) against zirconia toughened alumina (Biolox delta ceramic). Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 228(6), 587-592. https://doi.org/10.1177/0954411914538783

Carbon fibre–reinforced polyetheretherketone is an attractive alternative to ultra-high-molecular-weight polyethylene in artificial joints, but little has been published on the influence of stress on the wear factor. We know that in ultra-high-molecu... Read More about The influence of nominal stress on wear factors of carbon-fibre reinforced polyetheretherketone (PEEK-OPTIMA Wear Performance) against zirconia toughened alumina (Biolox delta ceramic).

Retrieval analysis of alumina ceramic-on-ceramic bearing couples (2014)
Journal Article
Korim, M., Scholes, S., Unsworth, A., & Power, R. (2014). Retrieval analysis of alumina ceramic-on-ceramic bearing couples. Acta Orthopaedica, 85(2), 133-140. https://doi.org/10.3109/17453674.2014.894390

Background and purpose: Ceramic-on-ceramic (CoC) bearings have been in use in total hip replacement (THR) for more than 40 years, with excellent long-term survivorship. Although there have been several simulator studies describing the performance of... Read More about Retrieval analysis of alumina ceramic-on-ceramic bearing couples.

Does surface wettability influence the friction and wear of large-diameter CoCrMo alloy hip resurfacings? (2013)
Journal Article
Curran, S., Hoskin, T., Williams, S., Scholes, S. C., Kinbrum, A., & Unsworth, A. (2013). Does surface wettability influence the friction and wear of large-diameter CoCrMo alloy hip resurfacings?. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 227(8), 847-858. https://doi.org/10.1177/0954411913488508

Biotribological study of large diameter ceramic-on-CFR-PEEK hip joint including fluid uptake, wear and frictional heating (2012)
Journal Article
Wang, Q., Wu, J., Unsworth, A., Briscoe, A., Jarman-Smith, M., Lowry, C., …Collins, S. (2012). Biotribological study of large diameter ceramic-on-CFR-PEEK hip joint including fluid uptake, wear and frictional heating. Journal of Materials Science: Materials in Medicine, 23(6), 1533-1542. https://doi.org/10.1007/s10856-012-4617-3

A novel material combination of a large diameter Biolox® Delta zirconia-toughened-alumina (ZTA) head and a pitch-based carbon fibre reinforced poly ether–ether-ketone (CFR-PEEK) MOTIS® cup has been studied. The acetabular cups were inclined at three... Read More about Biotribological study of large diameter ceramic-on-CFR-PEEK hip joint including fluid uptake, wear and frictional heating.

In pursuit of fluid-film lubrication (2011)
Presentation / Conference Contribution
Unsworth, A. (2011, December). In pursuit of fluid-film lubrication. Presented at ISTA 24th Annual Congress, Bruges, Belgium

Wear and surface analysis of 38 mm ceramic-on-metal total hip replacements under standard and severe wear testing conditions (2011)
Journal Article
Williams, S., Wu, J., Unsworth, A., & Khan, I. (2011). Wear and surface analysis of 38 mm ceramic-on-metal total hip replacements under standard and severe wear testing conditions. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 225(8), 783-796. https://doi.org/10.1177/0954411911404773

The purpose of this study was to compare the wear of zirconia-toughened alumina (ZTA) and alumina femoral heads tested against as-cast CoCrMo alloy acetabular cups under both standard and severe wear conditions. A new severe test, which included medi... Read More about Wear and surface analysis of 38 mm ceramic-on-metal total hip replacements under standard and severe wear testing conditions.

Tribological testing of pre-assembled alumina matrix composite hip prostheses (2010)
Book Chapter
Scholes, S., & Unsworth, A. (2010). Tribological testing of pre-assembled alumina matrix composite hip prostheses. In J. Cobb (Ed.), Modern Trends in THA bearings; materials and clinical performance (139-143)

The wear performance of PEEK OPTIMA based self-mating couples (2010)
Journal Article
Scholes, S., & Unsworth, A. (2010). The wear performance of PEEK OPTIMA based self-mating couples. Wear, 268(3-4), 380-387

Particle debris analysis and biological response of Motis acetabular cup wear debris over a 25 million cycle simulator test (2009)
Presentation / Conference Contribution
Kinbrum, A., & Unsworth, A. (2009, October). Particle debris analysis and biological response of Motis acetabular cup wear debris over a 25 million cycle simulator test. Presented at 22nd Annual Congress of ISTA, Hawaii

Biotribological and structural characteristics of 38 mm ZTA ceramic versus as-cast CoCrMo hip bearings. (2009)
Presentation / Conference Contribution
Williams, S., Wu, J., Unsworth, A., & Khan, I. (2009, October). Biotribological and structural characteristics of 38 mm ZTA ceramic versus as-cast CoCrMo hip bearings

The effect of third body alumina particles on the wear and surface topography of 38 mm ceramic on as-cast CoCrMo total hip replacements (2009)
Presentation / Conference Contribution
Williams, S., Wu, J., Khan, I., & Unsworth, A. (2009, October). The effect of third body alumina particles on the wear and surface topography of 38 mm ceramic on as-cast CoCrMo total hip replacements. Presented at 22nd Annual Congress of ISTA, Hawaii

Biotribological and structural characteristics of 28 mm diameter ZTA-ZTA hip joints under standard and aggressive wear conditions using a ProSim hip simulator (2009)
Presentation / Conference Contribution
Giddings, D., Wu, J., Khan, I., & Unsworth, A. (2009, October). Biotribological and structural characteristics of 28 mm diameter ZTA-ZTA hip joints under standard and aggressive wear conditions using a ProSim hip simulator. Presented at Annual Congress ISTA, Hawaii

Correlation of friction measurements with wear characteristics during multi-station hip simulator wear tests (2009)
Presentation / Conference Contribution
Weisenburger, J., Naylor, M., Schroeder, D., White, B., Unsworth, A., Garvin, K., & Haider, H. (2009, October). Correlation of friction measurements with wear characteristics during multi-station hip simulator wear tests. Presented at 22nd Annual Congress of ISTA, Hawaii

Tribological and surface analysis of 38mm alumina–as-cast Co–Cr–Mo total hip arthroplasties (2009)
Journal Article
Williams, S., Wu, J., Unsworth, A., & Khan, I. (2009). Tribological and surface analysis of 38mm alumina–as-cast Co–Cr–Mo total hip arthroplasties. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 223(8), 941-954. https://doi.org/10.1243/09544119jeim590

There is currently much discussion over the use of ceramic femoral components against metal acetabular cups, for use in total hip arthroplasty. The current study investigates six hot isostatically pressed alumina femoral heads of 38 mm diameter artic... Read More about Tribological and surface analysis of 38mm alumina–as-cast Co–Cr–Mo total hip arthroplasties.

Pitch-based carbon-fibre-reinforced poly (ether-ether-ketone) OPTIMA assessed as a bearing material in a mobile bearing uniconylar knee joint. (2009)
Journal Article
Scholes, S., & Unsworth, A. (2009). Pitch-based carbon-fibre-reinforced poly (ether-ether-ketone) OPTIMA assessed as a bearing material in a mobile bearing uniconylar knee joint. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 223(1), 13-25. https://doi.org/10.1243/09544119jeim471

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