[Rifampicin diffusion in non-infected human bone (author's transl)]

Area of Science:

• Pharmacokinetics and Drug Metabolism
• Orthopedic Surgery
• Infectious Diseases

Context:

• Assessing antibiotic penetration into bone is crucial for treating osteomyelitis.
• Rifampicin is a key antibiotic for Staphylococcal infections, but its bone penetration is not well-established.
• Understanding drug levels in different bone types informs treatment strategies for bone infections.

Purpose:

• To quantify rifampicin concentrations in human serum, cortical bone, and spongious bone.
• To evaluate rifampicin diffusion into bone tissue in patients undergoing hip replacement.
• To compare bone-penetrating antibiotic levels against the minimum inhibitory concentration (MIC) for Staphylococcus aureus.

Summary:

• Rifampicin levels were measured in serum and bone (cortical and spongious) of 13 patients after 24-72 hours of 600 mg daily oral administration.
• Mean rifampicin levels were 0.67 µg/g in cortical bone and 3.35 µg/g in spongious bone.
• Bone rifampicin levels exceeded the MIC for Staphylococcus aureus, suggesting effective concentrations for treating bone and joint infections.

Impact:

• Provides crucial data on rifampicin bone penetration, aiding in the management of bone and joint infections.
• Highlights the potential efficacy of rifampicin in treating osteomyelitis caused by Staphylococcus aureus.
• Informs antibiotic dosing and selection for orthopedic infections, potentially improving patient outcomes.