Document Detail

Preclinical evaluation method for total knees designed to restore normal knee mechanics.
MedLine Citation:
PMID:  20381994     Owner:  NLM     Status:  In-Process    
The objective was to develop a simple, rapid, and low-cost method for evaluating proposed new total knee arthroplasty (TKA) models and then to evaluate 3 different TKA models with different kinematic characteristics. A "desktop" knee testing rig was used to apply forces and moments over a full flexion range, representing a spectrum of positions and activities; and the positions of the femur on the tibia were measured. The average neutral path of motion (for compressive force only) and the laxities about the neutral path (for superimposed shear and torque) were determined from 8 knee specimens to be used as a benchmark for the TKA evaluations. A typical posterior-stabilized TKA did not display the normal external femoral rotation with flexion and also showed abnormal anterior sliding on the medial side. A medial-pivot type of guided-motion design showed medial stability comparable to anatomical but still did not produce external femoral rotation and posterior lateral displacement with flexion. The addition of a central cam-post produced the rotation and displacement but only after 75° of flexion. It was concluded that the test method satisfied the objective and could be used as a design tool for evaluating new and existing designs, as well as for formulating a TKA with anatomical characteristics.
Peter S Walker; Yonah Heller; David J Cleary; Gokce Yildirim
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-04-09
Journal Detail:
Title:  The Journal of arthroplasty     Volume:  26     ISSN:  1532-8406     ISO Abbreviation:  J Arthroplasty     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8703515     Medline TA:  J Arthroplasty     Country:  United States    
Other Details:
Languages:  eng     Pagination:  152-60     Citation Subset:  IM    
Copyright Information:
Copyright © 2011. Published by Elsevier Inc.
Laboratory for Minimally-Invasive Surgery, Department of Orthopaedic Surgery, NYU Hospital for Joint Diseases, New York, New York, USA.
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