Definition and evaluation of testing scenarios for knee wear simulation under conditions of highly demanding daily activities

Schwiesau, Jens; Schilling, Carolin; Kaddick, Christian; Utzschneider, Sandra; Jansson, Volkmar; Fritz, Bernhard; Blömer, W.; Grupp, Thomas M.

doi:10.1016/j.medengphy.2012.07.003

Cited by 40 publications

(24 citation statements)

References 44 publications

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“…This is probably attributable to the more complex loading conditions in vivo and the fact that simulation studies aim to reproduce the wear damage which occurs in an optimally aligned knee prosthesis without taking into account patient and surgery specific variances from the ideal. Future work should include additional in vitro testing in order to enlarge the statistical power and comparisons with in vitro tests simulating high demanding activities including stair climbing, hiking, and deep squatting [29]. Wear damage related volume loss and material morphology should be assessed by means of microCT and optical interferometry for further quantification of the surface damage and to obtain information about any potential damages within the material.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Carbon Fiber Reinforced PEEK Hinge Mechanism Articulation Components in a Rotating Hinge Knee Design: A Comparison of In Vitro and Retrieval Findings

Schierjott

Giurea

Neuhaus

et al. 2016

BioMed Research International

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Carbon fiber reinforced poly-ether-ether-ketone (CFR-PEEK) represents a promising alternative material for bushings in total knee replacements, after early clinical failures of polyethylene in this application. The objective of the present study was to evaluate the damage modes and the extent of damage observed on CFR-PEEK hinge mechanism articulation components after in vivo service in a rotating hinge knee (RHK) system and to compare the results with corresponding components subjected to in vitro wear tests. Key question was if there were any similarities or differences between in vivo and in vitro damage characteristics. Twelve retrieved RHK systems after an average of 34.9 months in vivo underwent wear damage analysis with focus on the four integrated CFR-PEEK components and distinction between different damage modes and classification with a scoring system. The analysis included visual examination, scanning electron microscopy, and energy dispersive X-ray spectroscopy, as well as surface roughness and profile measurements. The main wear damage modes were comparable between retrieved and in vitro specimens (n = 3), whereby the size of affected area on the retrieved components showed a higher variation. Overall, the retrieved specimens seemed to be slightly heavier damaged which was probably attributable to the more complex loading and kinematic conditions in vivo.

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Section: Discussionmentioning

confidence: 99%

Analysis of Carbon Fiber Reinforced PEEK Hinge Mechanism Articulation Components in a Rotating Hinge Knee Design: A Comparison of In Vitro and Retrieval Findings

Schierjott

Giurea

Neuhaus

et al. 2016

BioMed Research International

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“…Until recently, only cyclic input has been used [Kurtz, 2009]. At most, a few different activities have been included in a study [Franta et al, 2011;Muratoglu et al, 2002;Schwiesau et al, 2013;Wang et al, 2008]. Instead of including a few high demand activities in the wear test in addition to walking, the non-cyclic motion and load inputs are designed so that they can be considered to contain, within biomechanically realistic limits, all relevant activities at once [Saikko and Kostamo, 2011].…”

Section: Introductionmentioning

confidence: 99%

In vitro wear simulation on the RandomPOD wear testing system as a screening method for bearing materials intended for total knee arthroplasty

Saikko

2014

Journal of Biomechanics

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The 16-station RandomPOD wear test system, previously validated for prosthetic hip wear, was used in the simulation of knee wear mechanisms with a ball-on-flat test configuration.This consisted of a CoCr pin with a ground and polished spherical bearing surface (radius 28 mm) against a conventional, gamma-sterilized UHMWPE disk in serum lubrication. The biaxial motion, consisting of x and y translations, and the load were non-cyclic. Relative to the disk, the center of contact wandered within a circle of 10 mm diameter, and the average sliding velocity was 15.5 mm/s (range 0 to 31 mm/s). The load varied non-cyclically between 0 and 142 N (average 73 N). In the 60-day test with 16 similar wear couples, moderate adhesive wear, the principal wear mechanism of a well-functioning prosthetic knee, dominated. This showed as a burnished, circular wear mark (diameter 13.2 mm, area 137 mm 2 ). The wear factor was 2.04 ± 0.03 × 10 -6 mm 3 /Nm (mean ± 95 per cent confidence limit). For the first time a truly multidirectional, realistic and uniform, large capacity pin-ondisk simulation of knee wear mechanisms was implemented.

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“…The purpose of our study was to obtain a picture of the overall wear (articulation and backside surfaces) of 0.1% vitamin e blended polyethylene liners with a press-fit locking mechanism under a 20 million cycles hip wear simulation, equivalent to approximately 11.4 years in vivo service [14]. More specifically, our purposes were to analyze the backside wear of the liners, which wear modes can be expected and if this type of wear increases with time.…”

Section: Objectivesmentioning

confidence: 99%

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

Reyna

Holderied

Jäger³

et al. 2018

Traumatology and Orthopedics of Russia

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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.

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Definition and evaluation of testing scenarios for knee wear simulation under conditions of highly demanding daily activities

Cited by 40 publications

References 44 publications

Analysis of Carbon Fiber Reinforced PEEK Hinge Mechanism Articulation Components in a Rotating Hinge Knee Design: A Comparison of In Vitro and Retrieval Findings

Analysis of Carbon Fiber Reinforced PEEK Hinge Mechanism Articulation Components in a Rotating Hinge Knee Design: A Comparison of In Vitro and Retrieval Findings

In vitro wear simulation on the RandomPOD wear testing system as a screening method for bearing materials intended for total knee arthroplasty

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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