Background
Limited outcome data exists regarding partial-oral antibiotic therapy, defined as oral antibiotics as part of a patient’s treatment, for bone and joint infections (BJI) in people who inject drugs (PWID).
Methods
We conducted a retrospective study of all PWID reporting drug use within three months and BJI requiring six or more weeks of antibiotics in an urban safety-net hospital between February 1, 2019 and February 1, 2021. Treatment outcomes were assessed by chart review. Rates of failure, defined as death, symptoms or signs concerning for worsening or recurrent infections, were assessed 90 and 180 days after completion of antibiotics. Univariate logistic regression was used to explore the association between covariates and failure.
Results
Of 705 patients with BJI, 88 (13%) were PWID. Eighty-six patients were included in the final cohort. Forty-four (51%) were homeless; 50 (58%) had spine infection; 68 (79%) had surgery; and 32 of 68 (47%) had postoperatively retained hardware. Twelve (14%) of 86 patients received exclusively intravenous (IV) antibiotics, and 74 (86%) received partial-oral antibiotics. Twelve (14%) of 86 patients had patient-directed discharge. In those received partial-oral antibiotics, the failure rate was 20% at 90 days, and 21% at 180 days after completion of intended treatment. Discharge to a medical respite and follow-up with infectious diseases (ID) or surgery were negatively associated with odds of failure.
Conclusions
Partial-oral treatment of BJI in PWID was a common practice and often successful when paired with medical respite and follow-up with ID or surgery.