Document Detail


Knee posture predicted from subchondral apparent density in the distal femur: an experimental validation.
MedLine Citation:
PMID:  18286608     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Spatial patterning in the apparent density of subchondral bone can be used to discriminate between species that differ in their joint loading conditions. This study provides an experimental test of two hypotheses that relate aspects of subchondral apparent density patterns to joint loading conditions. First, the region of maximum subchondral apparent density (RMD) will correspond to differences in joint posture at the time of peak locomotor loads; and second, differences in maximum density between individuals will correspond to differences in exercise level. These hypotheses were tested using three age-matched samples of juvenile sheep. Two groups of five sheep were exercised, at moderate walking speeds, twice daily for 45 days on a treadmill with either a 0% or 15% grade. The remaining sheep were not exercised. Sheep walking on the inclined treadmill used more flexed knee postures than those in the level walking group at the time of peak vertical ground reaction forces. Kinematic measurements of knee posture were compared with knee postures estimated from the spatial position of the RMD on the medial femoral condyle. Our results show that the difference in the position of the RMD between the incline and level walking groups corresponded to the difference in knee postures obtained kinematically; however, exercised and nonexercised sheep did not differ in the magnitude of apparent density. These results suggest that patterns of subchondral apparent density are good indicators of the experimental modifications in joint posture during locomotion and may, therefore, be used to investigate differences between species in habitual joint loading.
Authors:
John D Polk; J Blumenfeld; K Ahluwalia; D Ahluwalia
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Validation Studies    
Journal Detail:
Title:  Anatomical record (Hoboken, N.J. : 2007)     Volume:  291     ISSN:  1932-8486     ISO Abbreviation:  Anat Rec (Hoboken)     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-02-27     Completed Date:  2008-04-17     Revised Date:  2009-12-16    
Medline Journal Info:
Nlm Unique ID:  101292775     Medline TA:  Anat Rec (Hoboken)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  293-302     Citation Subset:  IM    
Affiliation:
Department of Anthropology, University of Illinois, Urbana-Champaign, Urbana, IL 61801, USA. jdpolk@uiuc.edu
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Animals
Bone Density*
Femur / physiology*,  radiography
Image Processing, Computer-Assisted
Imaging, Three-Dimensional
Models, Biological
Physical Exertion / physiology*
Posture*
Range of Motion, Articular
Reproducibility of Results
Sheep
Stifle / physiology*
Time Factors
Tomography, X-Ray Computed
Video Recording
Walking
Weight-Bearing
Comments/Corrections
Erratum In:
Anat Rec (Hoboken). 2008 Jul;291(7):894
Note: Ahluwalia, D [corrected to Ahluwalia, K]

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


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