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Orthopaedic Proceedings
Vol. 99-B, Issue SUPP_22 | Pages 65 - 65
1 Dec 2017
PHENOTYPIC AND GENOTYPIC CHARACTERISATION OF STAPHYLOCOCCUS EPIDERMIDIS FROM ORTHOPAEDIC DEVICE-RELATED INFECTIONS CORRELATED WITH PATIENT OUTCOME
Post V Morgenstern M Harris L Mageiros L Hitchings MD Méric G Pascoe B Sheppard SK Richards G Moriarty F
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Aim

Staphylococcus epidermidis has emerged as an important opportunistic pathogen causing orthopedic device-related infections (ODRIs). In this prospective clinical and laboratory study, we have investigated the association of genome variation and phenotypic features of the infecting S. epidermidis isolate with the clinical outcome of the infected patient.

Method

One hundred and four invasive S. epidermidis isolates were prospectively collected from patients with ODRI. Upon patient entry into the study, surgical parameters such as type of implant; open or closed fracture were documented. Personal characteristics were also documented and included: gender; age; body mass index (BMI); smoker/non-smoker; overall medical condition (Charlson comorbidity index); and chronic immunosuppressive conditions. Any revision surgeries involving the site of interest and all isolated pathogens were recorded throughout the course of treatment and follow-up. The clinical outcome after treatment was measured with a mean follow-up period (FUP) of 26 months, and each patient was then considered to have been “cured” or “not cured”. The isolates were tested for their antibiotic susceptibility and ability to form biofilm. Whole genome sequencing was performed on all isolates and genomic variation was related to features associated with “cured” and “not cured”.