Document Detail

A novel liner locking mechanism enhances retention stability.
MedLine Citation:
PMID:  14519347     Owner:  NLM     Status:  MEDLINE    
Acetabular liner retention of a novel design of liner locking was evaluated in static and cyclic endurance modes. The locking mechanism combines geometric form and accurate machining to give high conformity to the acetabular shell and minimise relative motion against the metal shell, minimising debris generation and escape or ingress. Using amended test liners with integral coupling, mean static pullout strength was determined to be 399+/-53 N and lever-out strength 28.03+/-2.8 N m. Cyclic loading of 5 N m for up to 10 million cycles caused no significant reduction in strength, no detectable fretting wear, and the sealing mechanism prevented particle access between the cup interior and the "effective joint space". The stability measured ensures secure and reliable in vivo retention of the liner, comparable with extant component designs using other liner locking mechanisms.
Warren Macdonald; Anders Aspenberg; C Magnus Jacobsson; Lars V Carlsson
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Validation Studies    
Journal Detail:
Title:  Medical engineering & physics     Volume:  25     ISSN:  1350-4533     ISO Abbreviation:  Med Eng Phys     Publication Date:  2003 Nov 
Date Detail:
Created Date:  2003-10-01     Completed Date:  2004-06-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9422753     Medline TA:  Med Eng Phys     Country:  England    
Other Details:
Languages:  eng     Pagination:  747-54     Citation Subset:  IM    
Department of Biomaterials Research, Institute for Surgical Sciences, University of Gothenburg, S-413 90, Gothenburg, Sweden.
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MeSH Terms
Compressive Strength
Equipment Failure Analysis / methods*
Hip Prosthesis*
Prosthesis Design
Prosthesis Failure
Surface Properties
Tensile Strength
Reg. No./Substance:
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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