Document Detail

A new load application system for in vitro study of ligamentous injuries to the human knee joint.
MedLine Citation:
PMID:  8748517     Owner:  NLM     Status:  MEDLINE    
This paper describes the design and accuracy evaluation of a new six degree of freedom load application system for in vitro testing of the human knee joint. External loads of both polarity in all six degrees of freedom can be applied either individually or in any combination while the knee is permitted to move unconstrained in response to applied loads. The flexion/extension degree of freedom permits the full physiological range of motion. In addition to external loads, forces of the three major muscle groups (quadriceps, hamstrings, gastrocnemius) crossing the joint can be developed. Full automation and rapid convergence of loads to programmed values are achieved through a computer which feeds command signals to servo controller/electro-pneumatic servo values. The servo values regulate pressure to pneumatic actuators which develop the various loads. Experiments undertaken to quantify the accuracy of both load and displacement measurements reveal that errors particularly in load measurement are effectively controlled through the apparatus design.
J M Bach; M L Hull
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biomechanical engineering     Volume:  117     ISSN:  0148-0731     ISO Abbreviation:  J Biomech Eng     Publication Date:  1995 Nov 
Date Detail:
Created Date:  1996-09-20     Completed Date:  1996-09-20     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7909584     Medline TA:  J Biomech Eng     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  373-82     Citation Subset:  IM; S    
Biomedical Engineering Graduate Group. University of California, Davis, CA 95616, USA.
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MeSH Terms
Anterior Cruciate Ligament / injuries*,  physiopathology
Athletic Injuries / physiopathology*
Isometric Contraction / physiology
Knee Injuries / physiopathology*
Medial Collateral Ligament, Knee / injuries*,  physiopathology
Range of Motion, Articular / physiology
Reference Values
Signal Processing, Computer-Assisted
Skiing / injuries*
Weight-Bearing / physiology*

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

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