Document Detail

Spatial distribution of hip capsule structural and material properties.
MedLine Citation:
PMID:  12413968     Owner:  NLM     Status:  MEDLINE    
Contemporary computational models potentially allow the practical incorporation of the effects of a joint capsule on both motion and the loads transmitted to the other parts of the joint. However, the required material properties have not been available for this purpose. To determine these properties we took both hip joints from five fresh-frozen, nondiseased cadavers. Following dissection and potting of the hemi-pelvis, distraction of the intact joint was conducted to measure the structural tangent stiffness of the joint capsule. Anatomical insertion points of the hip capsule were then recorded, and a complete capsulectomy was performed. Once excised, the capsule was sectioned into eight, approximately even sectors, and initial geometrical measurements were recorded for material property calculations. Material properties (i.e., structural tangent stiffness, failure load, ultimate strength, tangent modulus) were calculated using the load-displacement and geometric data collected for each of the sectors. This specimen-to-specimen thickness variability reveals significantly lower (p<0.01) average tangent structural stiffness values in the posterior-inferior portion of the capsule. Explorations of hip stability using numerical models can now be enhanced by incorporation of these experimental capsule data.
Kristofer J Stewart; Rohan H Edmonds-Wilson; Richard A Brand; Thomas D Brown
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of biomechanics     Volume:  35     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-04     Completed Date:  2003-01-15     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1491-8     Citation Subset:  IM    
Orthopaedic Biomechanics Laboratory, Department of Orthopaedic Surgery, University of Iowa, Iowa City, IA 52242-1100, USA.
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MeSH Terms
Aged, 80 and over
Hip Joint / anatomy & histology,  physiology*
Joint Capsule / anatomy & histology,  physiology*
Reproducibility of Results
Sensitivity and Specificity
Stress, Mechanical
Tensile Strength / physiology
Weight-Bearing / physiology
Grant Support
Comment In:
J Biomech. 2003 Sep;36(9):1403;author reply 1404   [PMID:  12893052 ]

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

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