Researchers at a prominent university have developed a surgical implant that can kill 87% of Staphylococcus aureus bacteria in laboratory tests while maintaining strength and compatibility with surrounding tissues.
This study suggests the potential for better infection control in common surgeries like hip and knee replacements. Bacterial colonization of implants is a major cause of postoperative failure.
While titanium implants have proven durable, they are not effective in preventing infections. Despite proactive use of antibiotics, life-threatening infections can occur immediately after surgery or as secondary infections months later. In approximately 7% of implant cases, surgeons must perform revision surgeries to remove the implant, clean the area, administer antibiotics, and insert a new implant.
Researchers utilized metal additive manufacturing to add 10% corrosion-resistant tantalum and 3% copper to the typical titanium implants. When bacteria encounter the copper surface, nearly all cell walls rupture. Tantalum promotes healthy cell growth in surrounding bones and tissues, aiding patient recovery. The researchers also studied wear to ensure that metal ions from the implant do not wear off and move to nearby tissues, causing toxicity.
The researchers continue their work, aiming to increase the bacterial death rate to over 99% without affecting tissue integration. They also aim to ensure these materials perform well under realistic load conditions, such as walking after knee replacement surgery.
