Sola2 AMF Knee System Added to Surgery and Antibiotics in Adults With Knee Implant Infection

The AMPLIFY trial is a prospective, multicenter, staged clinical investigation of the investigational Sola2 AMF Knee System in adults with confirmed knee periprosthetic joint infection (PJI) who will undergo debridement, antibiotics, and implant retention (DAIR) surgery and pathogen-appropriate antibiotic therapy.

The study is conducted under a single Investigational Device Exemption and includes two stages. Stage 1 is an open-label sentinel stage using sequential AMF temperature escalation. Sentinel participants receive active Sola2 AMF treatment, with safety review after each sentinel group before progression to the next planned temperature level or to the randomized stage. Stage 2 is a randomized, double-blind, sham-controlled stage in which participants are assigned to active Sola2 AMF treatment or sham AMF treatment.

The Sola2 AMF Knee System is an external, non-contacting investigational device that generates alternating magnetic fields intended to produce controlled heating at metallic knee implant surfaces. The AMF or sham treatment is administered in the operating room in conjunction with the planned DAIR procedure. All participants receive DAIR and pathogen-appropriate antibiotic therapy as part of their clinical care.

Safety oversight includes medical monitoring, independent Data Safety Monitoring Board review, and independent Clinical Events Committee adjudication as specified in the protocol.

Inclusion criteria

Eligible participants must meet all of the following criteria:

• Adult male or female participant aged ≥ 22 years at the time of surgery.
• PJI diagnosis of "infected" knee per the 2018 MSIS Definition of Periprosthetic Hip and Knee Infection.
• Patient presents with PJI symptoms lasting for ≤ 45 days.
• Well-fixed and functioning prosthesis during clinical exam at screening.
• Patient to be treated with DAIR, polyethylene spacer exchange and pathogen- appropriate antibiotic therapy.
• Implanted knee prosthesis must appear on the "AMPLIFY Implant List".
• All implanted knee prosthesis components must have a legible device identification label (implant sticker) available in the medical record.
• Able to comprehend and comply with postoperative instructions and willing to return for follow-up visits for the duration of the study.
• Consent to participate in study and sign the Informed Consent Form (ICF).

Exclusion criteria

Participants meeting any of the following criteria will be excluded:

• Implanted knee prosthesis not appearing on the "AMPLIFY Implant List".
• Implanted knee prosthesis has any femoral and/or tibial augments, sleeves, cones, or modified/extended stems.
• Un-resurfaced patella.
• Metal-backed patellar components.
• Patients not indicated for a DAIR procedure pre-operatively.
• Patients undergoing bilateral DAIR procedures during the same surgical session.
• Pre-operative determination that the surgical wound cannot be closed primarily and requires a wound vac as a method of wound closure (e.g., open wound managed for secondary intention healing or delayed primary closure); Use of closed-incision negative pressure therapy over a primarily closed incision is permitted.
• Previous DAIR procedure(s) performed on the affected knee joint within the last two years.
• Patients presenting with PJI symptoms lasting for >45 days.
• Patients on antibiotic therapy for an infection other than PJI of the knee.
• Body Mass Index (BMI) ≥ 45.
• Patients currently on bone-marrow suppressive chemotherapy for malignancy.
• Patients currently with active neutropenia.
• Presence of metallic implant(s), other than the femoral and tibial components, within the Sola2 treatment zone (+/- 20 centimeters from the knee joint line) including intramedullary nails, hip prosthesis femoral stem, or fracture fixation hardware.
• Patients with an upper-thigh circumference greater than 70 centimeters (cm) (28 inches (in), measured approximately 15 cm (6 in) proximal to the superior pole of the patella.
• Patients with implanted or nonremovable cardiac pacemakers, defibrillators or cardioverters, insulin pumps, nerve stimulators, or any other indwelling infusion pump.
• Patients who are pregnant or nursing.