A Case of Actinomyces Prosthetic Hip Infection.

Actinomyces is a species of gram-positive anaerobic commensal organisms found in the human oropharynx, gastrointestinal, and genitourinary tracts, which most often are implicated in cervicofacial infections. Rarely do these organisms cause joint infections. We present the case of a 68-year-old man with a prosthetic hip infection due to Actinomyces species. He underwent surgical incision and drainage with replacement of the prosthetic joint. Cultures grew Actinomyces species, and he was treated with a four-week course of ampicillin-sulbactam followed by eight weeks of amoxicillin-clavulanate. This organism is an uncommon pathogen, and few cases of prosthetic joint infection due to Actinomyces have previously been reported.