Zosyn 3.375 g IV every 8 hr (4 hr infusion)
Aztreonam 2 g IV every 8 hr
Metronidazole 500 mg IV every 8 hr
Duration can likley be shortened with adeqaute surgical intervention (7-10 days post-op); a longer duration will be needed for osteomyelitis (6-8 weeks).
Change to an oral regimen when patient is stable.