Knee wear simulation under conditions of highly demanding daily activities – Influence on an unicompartmental fixed bearing knee design

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

doi:10.1016/j.medengphy.2012.12.015

Cited by 26 publications

(30 citation statements)

References 41 publications

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“…Simulator studies typically report wear rates for conventional polyethylene between 2 and 20 mm 3 /10 6 for TKR [58,[60][61][62][63] and Displacements of the actuator were measured using a triangular laser displacement system (LAS-TM-104, Waycon GmbH, Taufkirchen, Germany). Rotations were calculated based on the actuator displacement and the distance between the actuator and the assumed transversal ankle rotational center.…”

Section: Clinical Relevancementioning

confidence: 99%

Force-controlled dynamic wear testing of total ankle replacements

et al. 2015

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Section: Clinical Relevancementioning

confidence: 99%

Force-controlled dynamic wear testing of total ankle replacements

et al. 2015

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“…Today, level walking is the sole activity applied in simulator studies as per ISO 14243‐1/3 standard. More accurate wear assessments could be based on various patient daily activities to create highly demanding testing conditions that can affect prosthesis durability, by activating different ultra high molecular weight polyethylene wear and failure mechanisms compared with the abrasive–adhesive phenomenon simulated with the level walking profiles, as suggested by Schwiesau and coworkers . Future testing directions should take into account in vivo worst scenario and the other activities associated in the normal lifespan of a TKP, such as stair climbing/descent or deep squatting, chair rising, and sitting, etc.…”

Section: Discussionmentioning

confidence: 99%

Displacement or Force Control Knee Simulators? Variations in Kinematics and in Wear

Affatato

2015

Artificial Organs

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The problems associated with prosthetic failure and revision surgery still constitute the main clinical problem of prosthetic surgery. The objective of wear evaluation is to determine the wear rate and its dependence on the test conditions. To obtain realistic results, a wear test can be performed to reproduce in vivo working conditions and compare the wear characteristics of various total knee prostheses designs. At the state of the art, two simulation concepts are available and defined in ISO 14243 standards series. In both these guidelines, level walking is the sole activity of daily living that is represented for testing. With so many variables and so many sources of error and the sensitivity of the output to these errors, can the motion determined in the simulator be representative of the in vivo motion? This article goes beyond the current status of these knee simulations comparing literature results.

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“…The testing machine accompanies oscillating rolling-sliding with ISO 14243-like test conditions and ISO 14243-near but constant loading pattern, as well as contacting parts of TKA-like dimensions and materials [11]. However, it was demonstrated Lubricants 2017, 5, 25 3 of 10 that simulator tests that represent level walking alone are not sufficient to reproduce in vivo failure modes [17]. Furthermore, as the simulator tests are done on the full TKA, they are believed to include design-specific wear characteristics, which are known to differ from bulk material testing [18].…”

Section: Introductionmentioning

confidence: 99%

Conventional and Highly Crosslinked Polyethylene in Total Knee Arthroplasty—A Design-Independent Wear Investigation

Paulus¹,

Woicinzski²,

Jansson³

et al. 2017

Lubricants

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Introduction: Improvement of total knee arthroplasty (TKA) materials is one promising approach for extending the lifetime of endoprostheses. The target of this study was to evaluate the sufficiency of TKA-design-independent rolling-sliding screening tests. Additionally, this study attempted to assess the relevance of the design of TKA systems for wear performance by comparison with a simulator study. Materials and Methods: A TKA-design-independent rolling-sliding testing machine was employed at ISO (the International Organization for Standardization) 14243-near conditions and physiologic level unidirectional rolling-sliding. Contact surfaces were generalized into elementary forms at curvatures of real endoprostheses: CoCr-cylinders on flat UHMWPE (ultra-high-molecular-weight-polyethylene) cuboids. Materials varied in resin and crosslinking. One conventional UHMWPE and three highly crosslinked polyethylenes were charged with an axial load of 2.5 kN for 5 million cycles. Wear was determined gravimetrically and the ranking was compared to a simulator study. Results: No statistically significant differences between either material were found. This was inconsistent with the results of a simulator survey. Conclusions:The results of the study indicate that this type of screening test is not able to correctly rank UHMWPE for use in TKA systems. The use of a UHMWPE plate in the test setup with a rolling-sliding cylinder is capable of producing visible wear marks in the bearing area, but the setup followed by a gravimetric measurement does not show reliable results. As the tested materials did not significantly vary in wear performance, it can be concluded that for differences in TKA wear-production, the design of TKR-systems can matter.

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Knee wear simulation under conditions of highly demanding daily activities – Influence on an unicompartmental fixed bearing knee design

Cited by 26 publications

References 41 publications

Force-controlled dynamic wear testing of total ankle replacements

Force-controlled dynamic wear testing of total ankle replacements

Displacement or Force Control Knee Simulators? Variations in Kinematics and in Wear

Conventional and Highly Crosslinked Polyethylene in Total Knee Arthroplasty—A Design-Independent Wear Investigation

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