Toyko-based researchers have combined calcium phosphate powder with a solidifying liquid, which can be dispensed in droplets to form 0.1mm-thick layers using a device similar to an inkjet printer. The CT Bone system, developed with Tokyo-based company Next 21, builds around 100 layers of the solution to form the shape of the replacement bone needed for surgery.
Currently, the technology is in its trial stages, but it is hoped to be available for use in the skull within three years. The process is then expected to be developed to create bones suitable for the rest of the body. Yuichi Tei, professor of bioengineering at the University of Tokyo, said: "At present, the treatment is only available for head injuries because the materials are not strong enough to bear heavy weights, ruling out replacement shin or thigh bones." As the process uses calcium phosphate, a component found in human bones, the custom-made versions are not likely to be rejected by the human body.