University of Toronto professor Bob Pilliar has found a secret ingredient for replacement bone and joints, calcium polyphosphate. The mineral makes up more than 70% of human bones and it could be used to connect the implant with the patient’s existing bone cells to encourage regrowth and create a longer-lasting replacement. University of Waterloo mechatronics engineer Mihaela Vlasea created a 3D printer that uses ultraviolet light and a light-reactive binding agent to fuse the powdered calcium polyphosphate material into a biodegradable bone scaffold. The physical structure of the 3D printed implant will encourage natural bone cells to migrate, and grow, into the scaffold implant, and as the implant begins to be broken down by the patient's body, real tissue will begin to replace it. You can read more over on 3DPrint.com: https://3dprint.com/133667/bone-and-joint-replacements/