Document Detail

Prosthetic loading during kneeling of persons with transfemoral amputation.
MedLine Citation:
PMID:  10659799     Owner:  NLM     Status:  MEDLINE    
Observations in the field of lower limb prosthetic rehabilitation have shown that several transfemoral prostheses show signs of wear on some components of the knee unit. This is thought to be a result of severe loading developed during activities associated with kneeling. Some prostheses may have failed due to repetitive action of such loading. In order to determine the nature and magnitude of the loads developed during kneeling by persons with transfemoral amputation, and to investigate the influence of various prosthetic parameters, an analysis of the results of 162 tests in prosthetic knee hyperflexion was undertaken. The services of four males with amputation were enlisted. The measurements involved simultaneous use of two Kistler force platforms, a six-channel strain gauge transducer mounted on the prosthetic shank, and a data acquisition system. The critical loads for this configuration were found to be the shear force on the knee hinge, the shear force imposed by the knee chassis on the shin, and the bending moment tending to hyperflex the knee. These loads ranged from 0.6 to 6.2 kN, 0.9 to 6.7 kN, and from 18.3 to 155.7 Nm, respectively. To achieve a comfortable kneeling position, some prostheses permit foot rotation about the pylon axis of 90 infinity to allow the shank to be approximately parallel to the ground. Tests were also conducted with the prostheses in this configuration and the most influential prosthetic parameter was found to be the external rotation of the foot (toe-out angle). During kneeling, it was found that the loading was dependent upon the position of the torso relative to the prosthesis, but loads were much higher than those developed during level walking.
E A Magnissalis; S E Solomonidis; W D Spence; J P Paul; S Zahedi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of rehabilitation research and development     Volume:  36     ISSN:  0748-7711     ISO Abbreviation:  J Rehabil Res Dev     Publication Date:  1999 Jul 
Date Detail:
Created Date:  2000-02-24     Completed Date:  2000-02-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8410047     Medline TA:  J Rehabil Res Dev     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  164-72     Citation Subset:  IM    
Bioengineering Unit, University of Strathclyde, Glasgow, UK.
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MeSH Terms
Artificial Limbs / adverse effects*
Equipment Failure Analysis / methods
Femur / surgery*
Knee Joint / physiology*
Prosthesis Design
Prosthesis Failure
Range of Motion, Articular
Signal Processing, Computer-Assisted
Transducers, Pressure

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

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