From the left: interferential screws made of polylactic acid, hydroxylapatite and medical stainless steel (Image: Fraunhofer IFAM)
Knee ligament damage is an injury all to common to sportsmen and women. The solution usually involves replacing the torn ligament with a piece of tendon from the leg, which is fixed to the bone by means of a titanium or stainless steel screw. Unfortunately, after a certain time another surgery is required to remove them. Now researchers have developed a screw that is bio-compatible and also biodegradable over time, making this second surgery unnecessary.