期刊
JOURNAL OF APPLIED PHYSIOLOGY
卷 105, 期 6, 页码 1881-1888出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/japplphysiol.90792.2008
关键词
mechanics; strain; mechanical trauma; quantitative polarized light imaging
资金
- Southern Consortium for Injury Biomechanics/ National Highway Traffic Safety Administration
- Catharine D. Sharpe Foundation
- Association for the Advancement of Automotive Medicine
- National Science Foundation [0547451]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0547451] Funding Source: National Science Foundation
Detecting the initiation of mechanical injury to biological tissue, and not just its ultimate failure, is critical to a sensitive and specific characterization of tissue tolerance, development of quantitative relationships between macro- and microstructural tissue responses, and appropriate interpretation of physiological responses to loading. We have developed a novel methodological approach to detect the onset and spatial location of structural damage in collagenous soft tissue, before its visible rupture, via identification of atypical regional collagen fiber kinematics during loading. Our methods utilize high- speed quantitative polarized light imaging to identify the onset of tissue damage in ligament regions where mean collagen fiber rotation significantly deviates from its behavior during noninjurious loading. This technique was validated by its ability to predict the location of visible rupture (P = 0.0009). This fiber rotation- based metric of damage identifies potential facet capsular ligament injury beginning well before rupture, at 51 +/- 12% of the displacement required to produce tissue failure. Although traditional macroscale strain metrics fail to identify the location of microstructural damage, initial injury detection determined by altered fiber rotation was significantly correlated (R = 0.757, P = 0.049) with tissue yield (defined by a decrease in stiffness), supporting the capabilities of this method. Damaged regions exhibited higher variance in fiber direction than undamaged regions (P = 0.0412).
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