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In vitro culture increases mechanical stability of human tissue engineered cartilage constructs by prevention of microscale scaffold buckling

Cornell Affiliated Author(s)

Author

J.M. Middendorf
S. Shortkroff
C. Dugopolski
S. Kennedy
J. Siemiatkoski
L.R. Bartell
Itai Cohen
L.J. Bonassar

Abstract

Many studies have measured the global compressive properties of tissue engineered (TE) cartilage grown on porous scaffolds. Such scaffolds are known to exhibit strain softening due to local buckling under loading. As matrix is deposited onto these scaffolds, the global compressive properties increase. However the relationship between the amount and distribution of matrix in the scaffold and local buckling is unknown. To address this knowledge gap, we studied how local strain and construct buckling in human TE constructs changes over culture times and GAG content. Confocal elastography techniques and digital image correlation (DIC) were used to measure and record buckling modes and local strains. Receiver operating characteristic (ROC) curves were used to quantify construct buckling. The results from the ROC analysis were placed into Kaplan-Meier survival function curves to establish the probability that any point in a construct buckled. These analysis techniques revealed the presence of buckling at early time points, but bending at later time points. An inverse correlation was observed between the probability of buckling and the total GAG content of each construct. This data suggests that increased GAG content prevents the onset of construct buckling and improves the microscale compressive tissue properties. This increase in GAG deposition leads to enhanced global compressive properties by prevention of microscale buckling. © 2017 Elsevier Ltd

Date Published

Journal

Journal of Biomechanics

Volume

64

Number of Pages

77-84,

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85030160616&doi=10.1016%2fj.jbiomech.2017.09.007&partnerID=40&md5=68f104124bd0318f497758296b388d87

DOI

10.1016/j.jbiomech.2017.09.007

Research Area

Group (Lab)

Itai Cohen Group

Funding Source

1536463
DGE-1650441
DMR-1120296
1F31-AR069977

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