Shear bonding strength of cement -bone interface under compression

Abstract

This study focuses on the experimental investigation of the shear bonding strength in the presence of normal stress of the cement-bone interface. For this study, special compressive and shear ‘biaxial’ jig was developed. The cement-bone interface is one of the most important factors in the aseptic failure. The experiments were performed with the small cement-bone specimens to verify the shear bonding strength in the interface. The author followed contemporary hip replacement surgery with a swine femur, prepared specimens by cutting into 10mm ×5mm×5mm (2.5mm: cement + 2.5mm: bone) specimens with low speed diamond cutter and tested it using INSTRON servo microforce system. The results showed that the cement-bone interface shear bonding strength increased with the increase of the normal stress based on the Hoffman’s multi-axial criteria diagram. From the regression equation, it is estimated that shear bonding strength increases 1.7 times (142%) as much as 1MPa incensement of normal stress. It is concluded that normal stress to the interface can decrease the shear failure.