caa a22 4500 605457735 CHVBK 20210128100225.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00167-014-3197-9 doi (NATIONALLICENCE)springer-10.1007/s00167-014-3197-9 Changes in surface topography at the TKA backside articulation following in vivo service: a retrieval analysis [Elektronische Daten] [Richard Holleyman, Susan Scholes, David Weir, Simon Jameson, Jim Holland, Tom Joyce, David Deehan] Purpose: With the advent of modular total knee arthroplasty (TKA) systems, backside wear at the articulation between the ultra-high-molecular-weight-polyethylene (UHMWPE) component undersurface and the tibial baseplate has received increasing attention as a source of clinically significant polyethylene wear debris. The aim of this study was to investigate the reciprocating interface at the TKA undersurface articulation using profilometry after in vivo service. Our null hypothesis was that there would be no discernible pattern or relationship between the metal tibial baseplate and UHMWPE surface profile. Methods: A nanoscale analysis of thirty retrieved fixed-bearing TKA explants was performed. Surface roughness (Sa) and skewness (Ssk) were measured on both the UHMWPE component undersurface and the tibial baseplate of explants using a non-contacting profilometer (1nm resolution). Four pristine unimplanted components of two different designs (Stryker Kinemax and DePuy PFC) were examined for control purposes. Results: Mean explant baseplate surface roughness was 1.24μm (0.04-3.01μm). Mean explant UHMWPE undersurface roughness was 1.16μm (0.23-2.44μm). Each explant had an individual roughness pattern with unique baseplate and undersurface UHMWPE surface roughness that was different from, but closely related to, surface topography observed in control implants of the same manufacturer and design. Following in vivo service, UHMWPE undersurface showed changes towards a negative skewness, demonstrating that wear is occurring at the backside interface. Conclusion: In vivo loading of the TKA prosthesis leads to measurable changes in surface profile at the backside articulation, which appear to be dependent on several factors including implant design and in vivo duration. These findings are consistent with wear occurring at this surface. Findings of this study would support the use of a polished tibial tray over an unpolished design in total knee arthroplasty with the goal of reducing PE wear by means of providing a smoother backside countersurface for the UHMWPE component. Springer-Verlag Berlin Heidelberg, 2014 Profilometry nationallicence Surface properties nationallicence Backside wear nationallicence Undersurface articulation nationallicence Knee arthroplasty nationallicence Retrieval nationallicence Holleyman Richard Newcastle Upon Tyne Hospitals Trust, Royal Victoria Infirmary & Freeman Hospital, NE1 4LP, Newcastle upon Tyne, UK aut Scholes Susan Newcastle University, Newcastle upon Tyne, UK aut Weir David Newcastle Upon Tyne Hospitals Trust, Royal Victoria Infirmary & Freeman Hospital, NE1 4LP, Newcastle upon Tyne, UK aut Jameson Simon University Hospital of North Durham, Durham, UK aut Holland Jim Newcastle Upon Tyne Hospitals Trust, Royal Victoria Infirmary & Freeman Hospital, NE1 4LP, Newcastle upon Tyne, UK aut Joyce Tom Newcastle University, Newcastle upon Tyne, UK aut Deehan David Newcastle Upon Tyne Hospitals Trust, Royal Victoria Infirmary & Freeman Hospital, NE1 4LP, Newcastle upon Tyne, UK aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/12(2015-12-01), 3523-3531 0942-2056 23:12<3523 2015 23 167 https://doi.org/10.1007/s00167-014-3197-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-3197-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Holleyman Richard Newcastle Upon Tyne Hospitals Trust, Royal Victoria Infirmary & Freeman Hospital, NE1 4LP, Newcastle upon Tyne, UK aut NATIONALLICENCE 700 1- Scholes Susan Newcastle University, Newcastle upon Tyne, UK aut NATIONALLICENCE 700 1- Weir David Newcastle Upon Tyne Hospitals Trust, Royal Victoria Infirmary & Freeman Hospital, NE1 4LP, Newcastle upon Tyne, UK aut NATIONALLICENCE 700 1- Jameson Simon University Hospital of North Durham, Durham, UK aut NATIONALLICENCE 700 1- Holland Jim Newcastle Upon Tyne Hospitals Trust, Royal Victoria Infirmary & Freeman Hospital, NE1 4LP, Newcastle upon Tyne, UK aut NATIONALLICENCE 700 1- Joyce Tom Newcastle University, Newcastle upon Tyne, UK aut NATIONALLICENCE 700 1- Deehan David Newcastle Upon Tyne Hospitals Trust, Royal Victoria Infirmary & Freeman Hospital, NE1 4LP, Newcastle upon Tyne, UK aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/12(2015-12-01), 3523-3531 0942-2056 23:12<3523 2015 23 167