Case Report: An Elusive Case of Septic Arthritis

Abstract

Septic arthritis is a serious inflammatory infectious state of the joint secondary to microbial infection. In the pediatric population the most common route of infection is haematogenous spread. Less than fifty percent of patients with septic arthritis will yield positive culture results with a mortality rate of up to 42% in some cases. Due to the challenge in obtaining culture and identification of the causative organism the management of septic arthritis has been more of empirical in nature with the chosen antibiotic synchronized with the epidemiological data. Here is a case of a 14 months old female patient presenting at our hospital with a left knee and lower thigh swelling for three days with failure to bare weight on the limb. In addition, she had fever and diarrhea for three days. Upon evaluation clinical, laboratory and radiological findings supported septic arthritis expect for her blood, pus and synovial fluid culture of which all came back negative. She had poor response to intravenous ceftriaxone, gentamycin, metronidazole, ampicillin- cloxacillin and amoxicillin clavunate. Over the course of therapy, she developed septic shock, severe anemia and acute liver failure and was admitted to the intensive care unit. Afterwards she was initiated vancomycin and developed a hypersensitivity reaction with generalized edema which prompted cessation of the drug. Due to her critical state and poor response a triple therapy regimen composing of meropenem, ciprofloxacin and metronidazole was selected and maintained for three weeks followed by an oral clindamycin course for another three weeks of which she responded. In addition, surgical debridement arthrotomy, irrigation and drainage were done. Physiotherapy for rehabilitation is ongoing with patient recovering well.