Proportion of patients with prosthetic joint infection eligible for adjuvant phage therapy: a French single-centre...

Bone and joint infections represent a major public health issue due to their increasing prevalence, their functional prognosis and their cost to society. Phage therapy has valuable anti-biofilm properties against prosthetic joint infections (PJI). The aim of this study was to establish the proportion of patients eligible for phage therapy and to assess their clinical outcome judged against all patients presenting with PJI.

. Patients admitted for periprosthetic joint infection (PJI) at a French general hospital between 2015 and 2019 were retrospectively included. Eligibility for phage therapy was determined based on French recommendations, with polymicrobial infections serving as exclusion criteria. Patients were categorized into two groups: those eligible and those ineligible for phage therapy. We analyzed their characteristics and outcomes, including severe adverse events, duration of intravenous antibiotic therapy, length of hospitalization, and relapse rates.

. In this study, 96 patients with PJI were considered in multidisciplinary medical meetings. Of these, 44% patients (42/96) were eligible for additional phage therapy. This group of patients had a longer duration of intravenous therapy (17 days vs. 10 days, p = 0.02), more severe adverse events (11 vs. 3, p = 0.08) and had a longer hospital stay (43 days vs. 18 days, p < 0.01).

. A large number of patients met eligibility criteria for phage therapy and treatment and follow-up is more complex. A larger epidemiological study would more accurately describe the prognosis of eligible patients.