Nontoxic, biodegradable orthopedic implant could provide superior support to damaged bones

April 14, 2017, Purdue University
Purdue researchers are developing a biodegradable metal orthopedic implant that could be safely absorbed by the body. The image on the left is a histologic (cell) image of the Purdue-developed metal pins in-vivo in which the metal is being resorbed by the surrounding tissue. The image on the right shows conventional metal pins that are not effectively resorbed by the body. Credit: Marine Traverson and Gert Breur/Purdue College of Veterinary Medicine

Purdue University researchers are developing a nontoxic, biodegradable orthopedic implant that could be safely absorbed by the body after providing adequate support to damaged bones.

The development of the technology originated in the lab of Lia Stanciu, a professor of at Purdue in 2009. The technology could eliminate the need for a second surgery to remove conventional hardware.

"Currently, most implants use and titanium alloys for strength. This can cause long-term change in the mechanics of the specific region and eventual long-term deterioration," Stanciu said. "Additionally medical operations that require an orthopedic must be followed-up with a second surgery to remove the implant or the accompanying hardware of the implant resulting in higher medical costs and an increased risk of complications."

Co-inventors of the technology are Stanciu; Eric Nauman, a professor in Purdue's College of Engineering and director of the College of Engineering Honors Programs; Michael J Heiden, a PhD candidate; and Mahdi Dehestani, a graduate research assistant, both in Purdue's School of Materials Engineering.

Nauman said the resorbable metal technology provides superior properties compared to conventional metals.

"The implant has high porosity, which is empty space in the material, in which optimal vascular invasion can occur. This provides a way for cells to optimally absorb the material," he said. "Our technology is able to provide short-term fixation but eliminate the need for long-term hardware such as titanium or stainless steel that may require second surgeries to be retrieved,"

The orthopedic implant also uses manganese, which provides a better degradation rate, Stanciu added.

"Current resorbable metals are made with magnesium; however, this provides many adverse side effects to the body and degrades very quickly," she said. "We decided to use manganese instead of magnesium. Through studies we found that we can control the degradation rates from 22 millimeters per year to 1.2 millimeters per year pretty consistently. We also saw that manganese has a very good corrosion rate over time."

Nauman said the technology still exhibits the usual benefits associated with using biomaterials.

"With this technology we are able to tailor the surfaces such as de-alloying the surface to provide a better material for cells to grab on to and grow," he said. "We were also able to show that we could control cell attachment proliferation, an increase of the number of cells. Our still has all these usual benefits in addition to controlling the degradation rates of the metals."

Explore further: Magnesium surgical implants can be designed to biodegrade, promote bone growth

Related Stories

UC creates stronger, longer lasting medical implants

April 13, 2012

University of Cincinnati researchers have discovered that laser shock peening has an amazing effect when applied to magnesium alloys. When used on a magnesium alloy, LSP makes the alloy stronger and better controls the rate ...

Dental implants with antibacterial activity

December 28, 2016

The quest for surfaces capable of preventing bacterial colonisation and adhesion around dental implants is a subject of research interest, according to Beatriz Palla, a researcher in the Biomaterials Group of the UPV/EHU's ...

Recommended for you

What happened before the Big Bang?

March 26, 2019

A team of scientists has proposed a powerful new test for inflation, the theory that the universe dramatically expanded in size in a fleeting fraction of a second right after the Big Bang. Their goal is to give insight into ...

Cellular microRNA detection with miRacles

March 26, 2019

MicroRNAs (miRNAs) are short noncoding regulatory RNAs that can repress gene expression post-transcriptionally and are therefore increasingly used as biomarkers of disease. Detecting miRNAs can be arduous and expensive as ...

Race at the edge of the sun: Ions are faster than atoms

March 26, 2019

Scientists at the University of Göttingen, the Institut d'Astrophysique in Paris and the Istituto Ricerche Solari Locarno have observed that ions move faster than atoms in the gas streams of a solar prominence. The results ...

Physicists discover new class of pentaquarks

March 26, 2019

Tomasz Skwarnicki, professor of physics in the College of Arts and Sciences at Syracuse University, has uncovered new information about a class of particles called pentaquarks. His findings could lead to a new understanding ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.