Current models of the rib cage contain a discreet junction where the costal cartilage meets the rib bone. However, observations from a previous study find that the junction is not discreet and that this transition region varies in length among different subjects. Further investigation of this junction using a microCT scan found that the bone microstructure around the costal chondral junction extended above and below the cartilage midsubstance through the costal cartilage. The properties of this transition region could affect the frequency and location of rib fractures and be used to improve the current finite element models of the rib cage. This study investigates how the material properties of human ribs vary across costal chondral junction using microCT analysis along with ramp-hold, displacement driven indentation tests performed on the cartilage cross section and outer surface.