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Higher cefazolin concentrations with intraosseous regional prophylaxis in TKA
Simon W Young1, Mei Zhang, Joshua T Freeman
1Department of Orthopaedics, Middlemore Hospital, Private Bag 93311, Otahuhu, Auckland 1640, New Zealand. simonwyoung@gmail.com
Clinical Orthopaedics and Related Research
|July 10, 2012
Summary
Intraosseous cefazolin administration achieved significantly higher tissue concentrations than systemic dosing for total knee arthroplasty (TKA) patients. This regional antibiotic delivery method may improve infection prevention, especially against resistant bacteria.
Area of Science:
- Orthopedic Surgery
- Infectious Disease
- Pharmacology
Background:
- Prophylactic antibiotics are crucial for preventing deep infections after total knee arthroplasty (TKA).
- Systemic antibiotic delivery may yield insufficient tissue concentrations for combating resistant pathogens like coagulase-negative staphylococci.
- Regional intravenous antibiotic administration offers higher tissue concentrations but requires foot vein cannulation; intraosseous (IO) administration presents an alternative regional route.
Purpose of the Study:
- To compare the cefazolin tissue concentrations achieved via systemic versus regional intraosseous administration in primary TKA patients.
Main Methods:
- Twenty-two patients undergoing primary TKA were randomized into two groups.
- Group 1 received systemic cefazolin (1g) pre-tourniquet inflation.
- Group 2 received intraosseous cefazolin (1g) via tibial cannula post-tourniquet inflation; bone and subcutaneous fat samples were collected for antibiotic concentration measurement.
Main Results:
- Intraosseous administration resulted in mean cefazolin concentrations of 186 ug/g in subcutaneous fat and 130 ug/g in bone.
- Systemic administration yielded mean cefazolin concentrations of 11 ug/g in both subcutaneous fat and bone.
- These concentration differences were consistent throughout the surgical procedure.
Conclusions:
- Regional intraosseous administration of cefazolin achieves antibiotic tissue concentrations substantially higher (an order of magnitude) than systemic administration.
- Further research is needed to confirm if this enhanced delivery translates to improved efficacy in preventing surgical site infections, particularly those caused by coagulase-negative staphylococci.
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