From the Guidelines
For treating septic bursitis, empiric antibiotic therapy should initially target Staphylococcus aureus with cephalexin (500 mg orally four times daily), dicloxacillin (500 mg orally four times daily), or clindamycin (300-450 mg orally four times daily) for methicillin-sensitive strains, as recommended by the Infectious Diseases Society of America 1. When considering the treatment of septic bursitis, it's crucial to prioritize the most common causative organism, which is Staphylococcus aureus. The choice of antibiotic should be guided by the susceptibility of the organism, with methicillin-sensitive Staphylococcus aureus (MSSA) being treated differently than methicillin-resistant Staphylococcus aureus (MRSA).
- First-line treatment for MSSA typically includes:
- Cephalexin (500 mg orally four times daily)
- Dicloxacillin (500 mg orally four times daily)
- Clindamycin (300-450 mg orally four times daily)
- If MRSA is suspected, options include:
- Trimethoprim-sulfamethoxazole (1-2 double-strength tablets twice daily)
- Doxycycline (100 mg orally twice daily)
- Linezolid (600 mg orally twice daily) For severe cases requiring hospitalization, intravenous options such as vancomycin, daptomycin, or linezolid may be considered 2. Treatment duration typically ranges from 10-14 days, though more severe cases may require 2-3 weeks. Antibiotic selection should ultimately be guided by culture results from bursal fluid aspiration, which is essential for definitive diagnosis. In addition to antibiotics, treatment should include rest, elevation, immobilization, and sometimes serial drainage or surgical intervention for refractory cases. Prompt treatment is crucial to prevent complications such as osteomyelitis or septicemia.
From the Research
Antibiotic Treatment for Septic Bursitis
The following antibiotics are recommended for treating septic bursitis:
- Staphylococcus aureus is the most common cause of septic bursitis, and antibiotics effective against this organism are typically used 3, 4, 5
- Cloxacillin-based therapy has been shown to be effective in severe septic bursitis, with or without the addition of gentamicin or rifampicin 5
- Intravenous antibiotics, such as kanamycin and polymyxin, may be used in severe cases, especially when continuous drainage is desirable 3
- Oral antimicrobials, such as those effective against Staphylococcus aureus, may be sufficient in less severe cases 6
Specific Antibiotic Regimens
Some studies have reported the following antibiotic regimens:
- Cloxacillin, 2 g/4 h per day i.v. until improvement, and afterwards 1 g/6 h per day v.o. until resolution 5
- Gentamicin i.v. added to cloxacillin for 5 to 7 days (initial dose 240 mg/d) 5
- Rifampicin added to cloxacillin at a dose of 600 mg/d v.o. 5
- Kanamycin and polymyxin solution for local antibiotic irrigation 3
Duration of Antibiotic Therapy
The optimal duration of antibiotic therapy for septic bursitis is not defined, but most studies report treatment durations ranging from 19 to 24 days 3, 5