Microbubble Treatment for Periprosthetic Joint Infection

(PJI Trial)

This trial explores a new method to treat infections in knee replacements using ultrasound-activated microbubbles combined with antibiotics. The researchers aim to determine if this approach reduces the risk of infection recurrence compared to standard treatment alone. Participants will receive either the usual care or the usual care plus the microbubble treatment, which includes a special ultrasound and antibiotic injection shortly after surgery. The trial seeks individuals scheduled for specific types of knee revision surgeries due to infection. As a Phase 2 trial, the research focuses on assessing the treatment's effectiveness in an initial, smaller group of people.

The trial information does not specify whether you need to stop taking your current medications. It's best to discuss this with the trial coordinators or your doctor.

Research has shown that using ultrasound to break up microbubbles alongside antibiotics can be safe for people. One early study using the antibiotic amikacin and Definity microbubbles found that participants generally tolerated the treatment well. Most did not experience serious side effects, though some reported minor issues like irritation at the injection site.

Researchers are excited about the ultrasound-triggered microbubble destruction (UTMD) therapy for treating periprosthetic joint infections because it offers a novel approach to delivering antibiotics directly to the site of infection. Unlike traditional treatments that often involve systemic antibiotic administration or surgical intervention, this method uses ultrasound waves to burst microbubbles loaded with antibiotics right at the infection site, potentially enhancing the concentration and effectiveness of the drugs. This precise delivery system could lead to quicker recovery times and reduce the need for more invasive surgical procedures, making it an innovative step forward in managing joint infections.

Research has shown that using ultrasound with tiny bubbles and antibiotics may help treat infections around joint replacements. In this trial, participants will join one of two cohorts: Cohort 1, involving exchange arthroplasty, or Cohort 2, involving debridement, antibiotics, and implant retention (DAIR) revision surgery. Within each cohort, participants will be randomized into either a treatment group or a control group. The treatment group will receive ultrasound-triggered microbubble destruction (UTMD) therapy with antibiotics, while the control group will receive standard care without therapeutic interventions from the study team. These tiny bubbles can disrupt biofilms, protective layers that bacteria create to shield themselves from antibiotics. For instance, studies have found that combining ultrasound with these bubbles can help antibiotics kill bacteria more effectively than antibiotics alone. Early findings also suggest that this method can enhance drug delivery to infected areas, increasing their effectiveness. While more research is needed, these results offer hope for improved infection control in joint replacements.¹²³⁴⁶