A hydrophilic self-anchoring material for orthopedic devices

A hydrophilic polymer matrix reinforced with a 3D braided graphite structure is presented as a novel alternative to traditional metallic materials for orthopedic devices. This material has the mechanical properties of bone in the dry state. When fitted into a mold and immersed in an aqueous medium, its swelling tendency causes the application of a radial force on the mold, anchoring the material in place and enhancing bone deposition. The swelling behavior of the poly(acrylic acid) matrix as a function of the concentration of AMA and glycerol was characterized and reduced to 38 vol.%. A push-out test was conducted to determine the strength of the implant/mold interface. This was measured to be 8.3 MPa using an aluminum mold.<>