Feature Article
Incidence and Characteristics of Osteoarticular Infections in Patients With Infective Endocarditis
Abstract
Osteoarticular infections (OAIs) in the setting of infective endocarditis (IE) are uncommon. Although morbidity and mortality have been widely studied, details of the characteristics of patients with concurrent IE and OAI are limited. Therefore, the purpose of this study was to determine the (1) incidence, (2) mortality, (3) clinical features, and (4) microbiological profiles of OAIs in the setting of IE. A retrospective review was conducted of 1280 IE cases at a large academic institution between 2009 and 2015. Patients were categorized according to the following OAI types: spondylodiskitis, large joint septic arthritis, other site infections, or multiple affected joints. Inpatient mortality rates, clinical findings, and microbiological characteristics were compared between OAI types. Overall, the incidence of OAI among IE patients was 6.8% (n=87). The in-hospital mortality rate was 9.2% (n=8) and was not significantly associated with OAI type (P=.801). Eighteen patients had multiple affected joints resulting in a total of 114 infected sites. Of these, 39% (n=44) were spondylodiskitis, 29% (n=33) were large joint septic arthritis, and 32% (n=37) were infections of smaller joints. Back pain was most common among patients with spondylodiskitis (P<.001), whereas fever and general fatigue were most common with septic arthritis (P<.001). Of the available bone/ joint cultures, 69% were positive. Overall, Staphylococcus aureus was the most common IE pathogen in patients with both IE and OAI (63%). Clinicians should maintain a high suspicion for OAI in patients with IE caused by Staphylococcus aureus, particularly spondylodiskitis among those presenting with back pain. [Orthopedics 2020; 43(1):24–29.]
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