The following is an excerpt.
Scientists have developed an injectable gel containing stem cells that could be used to repair broken bones and damaged cartilage.
They have found that they can recreate the conditions that cause new cartilage and bone to develop in babies by attaching tiny magnetic particles to the surface of the stem cells. When a magnetic bandage is wrapped around the injured site, these particles react, simulating the effect of exercise that encourages bone to grow denser.
Read the full story here: Skele-Gro: how scientists are attempting to regrow bones