Spongy Material Helps Repair the Spine (Video) (image) American Chemical Society Share Print E-Mail Caption A polymer bone graft (held above in the top gloved hand) can expand in the body to just the right size to replace excised spinal tissue. Credit Photo credit: Lichin Lu Video credit: American Chemical Society Usage Restrictions Please use credits that are provided. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.