Document Detail


Physical equilibrium of the normal wrist and its relation to clinically defined "instability".
MedLine Citation:
PMID:  7797963     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The rotational stability of the proximal carpal row was tested on six unembalmed human cadaver hand specimens. The physiological load conditions were stimulated by loading the wrist flexor and extensor tendons. Pure torque was introduced to the lunate, scaphoid and triquetrum, one at a time, by means of a dynamometer wrench, forcing the bones loaded to perform a flexion-extension motion. A truly stable state of equilibrium could be found in the normal wrist only under axial load. A uni-directional coupling was observed through the scapho-lunate ligament as a counteraction to a tendency for the lunate to extend and the scaphoid to flex. The triquetrum and lunate moved together, showing close coupling in both directions. As conclusion: a stable wrist can be defined as one which, while being loaded within a physiological range of stress, does not deviate from a stable state of equilibrium (the ability to return to a single position when disturbed) at any point within the whole physiological range of motion.
Authors:
V Zdravkovic; H A Jacob; G R Sennwald
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of hand surgery (Edinburgh, Scotland)     Volume:  20     ISSN:  0266-7681     ISO Abbreviation:  J Hand Surg Br     Publication Date:  1995 Apr 
Date Detail:
Created Date:  1995-08-03     Completed Date:  1995-08-03     Revised Date:  2009-06-08    
Medline Journal Info:
Nlm Unique ID:  8403839     Medline TA:  J Hand Surg Br     Country:  SCOTLAND    
Other Details:
Languages:  eng     Pagination:  159-64     Citation Subset:  IM    
Affiliation:
Chirurgie St. Leonhard, Clinic for Hand and Outpatient Surgery, St. Gallen, Switzerland.
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MeSH Terms
Descriptor/Qualifier:
Carpal Bones / physiopathology
Humans
Joint Instability / physiopathology*
Ligaments, Articular / physiopathology
Range of Motion, Articular / physiology
Reference Values
Rotation
Tendons / physiopathology
Wrist Joint / physiopathology*

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


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