Document Detail

Relative movements between Kinemax Plus tibial inserts and the tibial base-plates.
MedLine Citation:
PMID:  12666776     Owner:  NLM     Status:  MEDLINE    
Tests were performed on six large Kinemax Plus knee bearings (snap-fit design) to evaluate the amount of movement between 10- and 15-mm-thick tibial inserts and the tibial base plates. The knee bearings were tested up to 1 x 10(6) cycles on the Durham six-station knee wear simulator which subjected the bearings to similar motion and loading profiles that would be experienced by the natural knee during walking. Although passive internal/external (I/E) rotation was allowed, no active I/E rotation was applied. The movement of the tibial inserts was measured with dial gauges (accuracy +/-0.01 mm) before and after the bearings were tested on the simulator, when unloaded, and throughout the tests while the bearings were being dynamically loaded in the simulator. Movement occurred between the tibial insert and the tibial base plate after initial assembly due to the snap-fit mechanism used to locate the tibial insert within the tibial base plate. However this decreased appreciably when the bearings were loaded in the simulator. The amount of movement did not change with time when the bearings were continuously loaded in the simulator. However, after each test the amount of movement of the tibial inserts, when unloaded, was only 65 per cent (anterior-posterior) and 46 per cent (medial-lateral) of the values before the test. This was thought to be due to creep of the ultra-high molecular weight polyethylene (UHMWPE) inserts. The movement between the tibial insert and tibial base plate in situ is likely to be much less than that observed by a surgeon at the time of assembly due to loading of the knee bearing in the body. However, the amount of movement when the tibial inserts are loaded may still be great enough to produce a second interface where wear of the tibial insert may take place.
H E Ash; S C Scholes; R Parkin; A Unsworth
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine     Volume:  217     ISSN:  0954-4119     ISO Abbreviation:  Proc Inst Mech Eng H     Publication Date:  2003  
Date Detail:
Created Date:  2003-04-01     Completed Date:  2003-05-14     Revised Date:  2009-06-08    
Medline Journal Info:
Nlm Unique ID:  8908934     Medline TA:  Proc Inst Mech Eng H     Country:  England    
Other Details:
Languages:  eng     Pagination:  99-104     Citation Subset:  IM    
Center for Biomedical Engineering, University of Durham, Durham DH1 3LE, UK.
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MeSH Terms
Coated Materials, Biocompatible
Equipment Failure Analysis / instrumentation,  methods*
Knee Joint / physiopathology*,  surgery
Knee Prosthesis
Materials Testing / instrumentation,  methods*
Prosthesis Design
Range of Motion, Articular
Sensitivity and Specificity
Surface Properties
Tibia / physiopathology
Walking / physiology
Reg. No./Substance:
0/Coated Materials, Biocompatible; 0/Polyethylenes; 0/ultra-high molecular weight polyethylene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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