In-vitro wear simulation of sequentially crosslinked and annealed polyethylene acetabular liners: 14 years of results

Wear ◽  
2017 ◽  
Vol 376-377 ◽  
pp. 232-235
Author(s):  
Sezen Buell ◽  
LaQuawn Loving ◽  
Lizeth Herrera ◽  
Reginald Lee ◽  
Aaron Essner
Keyword(s):  
Wear Simulation

scholarly journals Surface properties of monolithic zirconia after dental adjustment treatments and in vitro wear simulation

2015 ◽  
Vol 43 (1) ◽  
pp. 133-139 ◽  
Author(s):  
Verena Preis ◽  
Michael Schmalzbauer ◽  
Dominique Bougeard ◽  
Sibylle Schneider-Feyrer ◽  
Martin Rosentritt
Keyword(s):  
Surface Properties ◽  
Wear Simulation ◽  
Monolithic Zirconia

Polyethylene insert damage in unicondylar knee replacement: A comparison of in vivo function and in vitro simulation

2009 ◽  
Vol 224 (7) ◽  
pp. 823-830 ◽  
Author(s):  
M Harman ◽  
S Affatato ◽  
M Spinelli ◽  
M Zavalloni ◽  
S Stea ◽  
...  
Keyword(s):  
Knee Joint ◽  
Articular Surface ◽  
Standard Group ◽  
Simulation Methods ◽  
Wear Simulation ◽  
Damage Pattern ◽  
Articular Damage ◽  
In Vitro Simulation

Modification of knee joint wear simulation methods has included ‘anatomic attachment’ of unicondylar knee replacements (UKR) onto synthetic femurs with material properties and morphology similar to human femurs. The present study assesses the effect of such modification by comparing the damage patterns on UKR polyethylene inserts after in vitro simulation using standard and modified simulation methods with those on inserts retrieved after in vivo function. Three groups of UKR inserts were evaluated after retrieval (Explant Group, n = 17) or after knee joint wear simulation with the components attached to standard metal blocks (Standard Group, n = 6) or synthetic femurs (Anatomic Group, n = 6). All UKR had similar non-conforming articular surfaces. Articular damage patterns (mode, frequency, and area) were quantified using digital image photogrammetry. Although some common damage modes were noted, knee joint wear simulation with standard or ‘anatomic’ attachment did not generate damage pattern sizes similar to the explanted UKR. A focal damage pattern consistent with contact between the metal femoral articular surface and the polyethylene inserts was evident on all inserts, but only the Explant Group had evidence of dispersed damage dominated by abrasive modes. Synthetic femurs added complexity to the wear simulation without generating wear patterns substantially more similar to those observed on retrieved inserts.

scholarly journals Computational wear simulation of patellofemoral articular cartilage during in vitro testing

2011 ◽  
Vol 44 (8) ◽  
pp. 1507-1513 ◽  
Author(s):  
Lingmin Li ◽  
Shantanu Patil ◽  
Nick Steklov ◽  
Won Bae ◽  
Michele Temple-Wong ◽  
...  
Keyword(s):  
Articular Cartilage ◽  
In Vitro Testing ◽  
Wear Simulation

A Direct Comparision of Patient and Simulator Total Knee Replacement Kinematics

2001 ◽  
Author(s):  
John D. DesJardins ◽  
Scott A. Banks ◽  
Lisa C. Benson ◽  
Martine LaBerge
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Gold Standard ◽  
Patient Population ◽  
International Standards ◽  
Wear Testing ◽  
Wear Simulation ◽  
Total Knee

Abstract The need to critically evaluate the efficacy of current total knee replacement (TKR) wear testing methodologies is great. Proposed international standards for TKR wear simulation have been drafted, yet their validity continues to be debated. The “gold standard” to which all wear testing methodologies should be compared is the measured in vivo TKR performance of the patient population. With the exception of retrieval analyses, few detailed comparisons of in-vitro vs. in-vivo TKR performance have been performed to date. The current study compares simulator TKR wear testing kinematics to measured in vivo TKR kinematics to evaluate the validity of the proposed ISO force-controlled wear testing methodology.

scholarly journals Comparison of polyethylene tibial insert damage from in vivo function and in vitro wear simulation

2009 ◽  
Vol 27 (4) ◽  
pp. 540-548 ◽  
Author(s):  
Melinda K. Harman ◽  
John DesJardins ◽  
Lisa Benson ◽  
Scott A. Banks ◽  
Martine LaBerge ◽  
...  
Keyword(s):  
Wear Simulation ◽  
Tibial Insert

scholarly journals 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

2018 ◽  
Vol 24 (2) ◽  
pp. 29-40 ◽  
Author(s):  
A. L. Puente Reyna ◽  
M. Holderied ◽  
M. Jäger ◽  
C. Schilling ◽  
T. M. Grupp
Keyword(s):  
Vitamin E ◽  
Axial Load ◽  
Convex Surface ◽  
Wear Simulation ◽  
Press Fit ◽  
Locking Mechanism ◽  
Backside Wear ◽  
Measuring Machine ◽  
Fixation Area

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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