ARTICULATION AND BACKSIDE WEAR ANALYSIS AFTER LONG-TERM IN VITRO WEAR SIMULATION OF VITAMIN E STABILIZED POLYETHYLENE ACETABULAR LINERS WITH A PRESS-FIT LOCKING MECHANISM

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Abstract

A previous retrieval study analyzed the backside wear of short-term implanted liners against in vitro tested liners of similar life in service and showed comparable results among both groups, with no significant backside wear due to micro-motion.

The purpose — to obtain a picture of the overall wear (articulation and backside surfaces) of 0.1% vitamin e blended polyethylene liners, with a locking mechanism based on a press-fit cone in combination with a rough titanium conical inner surface in the fixation area, under a 20 million cycles hip wear simulation.

Materials and Methods. A semi-quantitative method was used in order to assess the damage on the backside of the liners and a 3d measuring machine to assess the creep and wear at the articulation surface.

Results. The total average backside wear score was 22.00±2.59 from a maximum total score of 147 after 5 million cycles (mc), increased to 31.92±5.57 after 10 mc, but showed no further increment after 15 and 20 mc. The reference liners (subjected only to axial load) showed similar wear scores and modes as the liners under wear simulation (axial load and movement). Small scratches produced during insertion and removal were clearly seen at the rim (fixation) area and no considerable abrasion was observed. The machining marks on the convex surface were always visible. Regarding the articulation surface, a steady state wear rate of 7 µm/year was measured.

Conlusion. These results determined that most of the backside wear produced on the liners occurred during their insertion and removal rather than during their life in service. Moreover, the wear at the articulation surface was similar to that seen in vivo at short- and mid-term on highly cross-linked polyethylene liners with and without vitamin e content.

About the authors

A. L. Puente Reyna

Aesculap AG, Research & Development; Ludwig Maximilians University Munich, Department of Orthopaedic Surgery, Physical Medicine & Rehabilitation, Campus Grosshadern Munich.

Author for correspondence.
Email: ana_laura.puente_reyna@aesculap.de
78532 Tuttlingen. Germany

M. Holderied

Aesculap AG, Research & Development.

Email: fake@neicon.ru
78532 Tuttlingen. Germany

M. Jäger

Department of Orthopaedics and Trauma Surgery, University of Duisburg-Essen.

Email: fake@neicon.ru
45147 Essen. Germany

C. Schilling

Aesculap AG, Research & Development.

Email: fake@neicon.ru
78532 Tuttlingen. Germany

T. M. Grupp

Aesculap AG, Research & Development; Ludwig Maximilians University Munich, Department of Orthopaedic Surgery, Physical Medicine & Rehabilitation, Campus Grosshadern Munich.

Email: fake@neicon.ru
78532 Tuttlingen. Germany

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CrossRef: 2

  1. Braun S, Vardag S, Mueller U, Schroeder S, Sonntag R, Bormann T, et al. Backside wear, particle migration and effectiveness of screw hole plugs in acetabular hip joint replacement with cross-linked polyethylene. Acta Biomaterialia. 2019;97:239. doi: 10.1016/j.actbio.2019.07.050
  2. Braun S, Sonntag R, Schroeder S, Mueller U, Jaeger S, Gotterbarm T, et al. Backside wear in acetabular hip joint replacement. Acta Biomaterialia. 2019;83:467. doi: 10.1016/j.actbio.2018.10.045

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