What Is the Treatment of Osteomyelitis? Empiric Anti-Staphylococcal Therapy and Response Goals
Osteomyelitis is a bone infection where timely selection of appropriate antimicrobial therapy is central to management. The approach is structured: empiric treatment is started promptly, and antibiotic selection is calibrated to local pathogen patterns before culture results are available.
Empiric antimicrobial therapy targeting Staphylococcus aureus is initiated after blood culture collection. The choice of agent is driven by the local prevalence of community-acquired MRSA — different agents are preferred depending on whether that prevalence is low or elevated. Once a clinical response is established, transition from intravenous to oral therapy is planned.
Treatment response is monitored by resolution of fever within 3 to 5 days and a decline in serum CRP of at least 50% within 4 days of starting therapy.
- In children with suspected AHO, we recommend using empiric antimicrobial therapy active against S. aureus (strong recommendation, and moderate certainty of evidence).
- Regarding the choice of anti-staphylococcal therapies, in regions where the prevalence of CA-MRSA causing pediatric AHO is low, cefazolin or oxacillin/nafcillin is preferred for empiric therapy of presumed MSSA infection based on greater safety and tolerability, compared with vancomycin or clindamycin, and greater efficacy compared with vancomycin; for regions with CA-MRSA prevalence 10% to 20% or greater, clindamycin or vancomycin is preferred.
- For children with suspected or documented AHO who respond to initial intravenous antibiotic therapy, we recommend transition to an oral antibiotic regimen rather than OPAT when an appropriate (active against the confirmed or presumed pathogen(s)) and well-tolerated oral antibiotic option is available (strong recommendation and low certainty of evidence).
- Excellent outcomes with the transition to oral therapy with high-dose cephalexin or clindamycin are well documented.
- In children with AHO presumed or proven to be caused by S aureus who have had an uncomplicated course and responded to initial therapy, we suggest a 3- to 4-week duration of antibiotics rather than a longer course (conditional recommendation and very low certainty of evidence).
- Fever, when present, usually resolves within 3 to 5 days in uncomplicated courses.
- In a series of 26 children with AHO, 92% experienced a decline in CRP of at least 50% within 4 days of therapy.