Orthopedic Infection Management

Treatment Principles

Surgical debridement is the mainstay of therapy and must be performed whenever feasible before or concurrent with antibiotic therapy, as recommended by the Infectious Diseases Society of America 1
A minimum 8-week course of antibiotics is recommended for MRSA osteomyelitis, with some experts suggesting an additional 1-3 months of oral combination therapy, according to the Infectious Diseases Society of America 1
MRI with gadolinium is the imaging modality of choice for detecting early osteomyelitis and monitoring treatment response, as suggested by the Infectious Diseases Society of America 1
ESR and/or CRP should be monitored to guide response to therapy; a reduction of at least 25-33% from baseline after 4 weeks suggests lower risk of treatment failure, as recommended by the Infectious Diseases Society of America 1 and the American College of Physicians 2

For septic arthritis, drainage or debridement of the joint space must always be performed, as recommended by the Infectious Diseases Society of America 1
A 3-4 week course of therapy is recommended for septic arthritis, which is shorter than osteomyelitis, according to the Infectious Diseases Society of America 1
For prosthetic joint infections with stable implants and symptoms <3 weeks duration, debridement with hardware retention plus antibiotics may be attempted, as suggested by the Infectious Diseases Society of America 1

Outpatient parenteral antimicrobial therapy (OPAT) is feasible with ceftriaxone due to once-daily dosing, reducing hospitalization costs and improving quality of life, as recommended by the Infectious Diseases Society of America 3
Peripheral IV catheters, PICCs, or tunneled central catheters can be used for administration, according to the Centers for Disease Control and Prevention 3

Do not use ceftriaxone empirically if MRSA is suspected - obtain cultures and use vancomycin or alternatives until susceptibilities confirm MSSA, as recommended by the Infectious Diseases Society of America 1
Do not rely on imaging alone to determine treatment duration; clinical response and inflammatory markers (CRP, ESR) are more reliable, according to the American College of Physicians 2 and the Infectious Diseases Society of America 1
Patients with sickle cell disease require coverage for Salmonella species, which ceftriaxone covers, as recommended by the American Academy of Pediatrics 7

Osteomyelitis: Minimum 8 weeks, with consideration for 1-3 additional months of oral suppressive therapy if debridement incomplete, as recommended by the Infectious Diseases Society of America 1
Septic arthritis: 3-4 weeks, according to the Infectious Diseases Society of America 1

CRP reduction of 25-33% after 4 weeks indicates lower risk of treatment failure; values >2.75 mg/dL suggest higher failure risk, as recommended by the American College of Physicians 2
CRP may paradoxically increase in the first few weeks despite clinical improvement, according to the American College of Physicians 2