Fluid spaces in normal and osteomyelitic canine bone

Area of Science:

• Orthopedics
• Infectious Diseases
• Pharmacology

Background:

• Cortical bone physiology is significantly altered by infection.
• Fluid spaces within cortical bone are modulated during osteomyelitis.
• Understanding these changes is crucial for effective antimicrobial treatment.

Purpose of the Study:

• To quantify fluid space alterations in cortical bone during experimental osteomyelitis.
• To compare fluid spaces in acute, subacute, and chronic osteomyelitis models.
• To assess the impact of these alterations on antimicrobial drug delivery.

Main Methods:

• Utilized an animal model of acute, subacute, and chronic tibial osteomyelitis.
• Employed volume of distribution studies with 14C-labeled sucrose and 99Tc-labeled red blood cells.
• Included sham-operated radius and tibia for control comparisons.

Main Results:

• Total exchangeable water, vascular, and interstitial fluid spaces were increased in all osteomyelitic bone types.
• Alterations in osteomyelitic bone were statistically significant compared to normal and control bone (p < 0.01).
• No significant differences were found among the fluid space alterations in acute, subacute, or chronic osteomyelitis (p > 0.05).

Conclusions:

• Osteomyelitis causes significant, comparable increases in cortical bone fluid spaces regardless of infection duration.
• These pathophysiological changes in fluid spaces must be considered for antimicrobial drug penetration into the interstitial fluid.
• Optimizing antimicrobial strategies requires accounting for altered bone fluid dynamics in osteomyelitis.