Subchondral Bone Micro-fractures and Micro-structural Stresses and Strains under Impact Compression: Combination of Mechanical Testing and μCT-Based Finite Element Mode
نویسندگان
چکیده
Introduction: Subchondral bone (SB) micro-fracture due to high-impact loading is a key factor leading to post traumatic knee osteoarthritis [1]. The apparent-level impact mechanics of SB has been previously investigated using mechanical tests [2]. However, to investigate the osteochondral injuries, the tissue-level impact mechanics, especifically, the mechanical parameters associated with SB micro-fractures are essential. In this study, we combined mechanical impact tests of cartilage-bone plugs with μCT image-based finite element models (FEM) of each specimen to determine the local stresses and strains associated with SB micro-fractures within the SB tissue. Articular cartilage (AC) was preserved in situ, as a medium for applying compression to SB, and also to avoid stress concentration at the SB surface.
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