Cancellous bone properties and matrix content of TGF-β2 and IGF-I in human tibia: A pilot study

Yener N. Yeni, X. Neil Dong, Bingbing Zhang, Gary J. Gibson, David P Fyhrie

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Transforming and insulin-like growth factors are important in regulating bone mass. Thus, one would anticipate correlations between matrix concentrations of growth factors and functional properties of bone. We therefore investigated the relationships of (1) TGF-β2 and (2) IGF-I matrix concentrations with the trabecular microstructure, stress distribution, and mechanical properties of tibial cancellous bone from six male human cadavers. Trabecular stress amplification (VMExp/σapp) and variability (VMCOV) were calculated using microcomputed tomography (μCT)-based finite element simulations. Bone volume fraction (BV/TV), surface/volume ratio (BS/BV), trabecular thickness (Tb.Th), number (Tb.N) and separation (Tb.Sp), connectivity (Eu.N), and anisotropy (DA) were measured using 3-D morphometry. Bone stiffness and strength were measured by mechanical testing. Matrix concentrations of TGF-β2 and IGF-I were measured by ELISA. We found higher matrix concentrations of TGF-β2 were associated with higher Tb.Sp and VMExp/σapp for pooled data and within subjects. Similarly, a higher matrix concentration of IGF-I was associated with lower stiffness, strength, BV/TV and Tb.Th and with higher BS/BV, Tb.Sp, VMExp/σ app and VMCOV for pooled data and within subjects. IGF-I and Tb.N were negatively associated within subjects. It appears variations of the stress distribution in cancellous bone correlate with the variation of the concentrations of TGF-β2 and IGF-I in bone matrix: increased local matrix concentrations of growth factors are associated with poor biomechanical and architectural properties of tibial cancellous bone.

Original languageEnglish (US)
Pages (from-to)3079-3086
Number of pages8
JournalClinical Orthopaedics and Related Research
Volume467
Issue number12
DOIs
StatePublished - Dec 2009

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Fingerprint Dive into the research topics of 'Cancellous bone properties and matrix content of TGF-β2 and IGF-I in human tibia: A pilot study'. Together they form a unique fingerprint.

  • Cite this