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Scintigraphic evaluation of experimental chronic osteomyelitis
E T Dams1, M W Nijhof, O C Boerman
1Department of Nuclear Medicine, University Hospital Nijmegen, The Netherlands.
Summary
New radiopharmaceuticals, technetium-99m-polyethyleneglycol (PEG) liposomes and technetium-99m-hydrazinonicotinamide (HYNIC)-immunoglobulin G (IgG), show promise for diagnosing chronic osteomyelitis. These agents performed effectively in a rabbit model, offering potential advantages over current methods.
Area of Science:
- Nuclear Medicine
- Radiopharmaceutical Development
- Infectious Disease Imaging
Background:
- Diagnosing chronic osteomyelitis is challenging due to limitations of conventional radiography and existing scintigraphic agents.
- Current scintigraphic agents like technetium-99m-methylene diphosphonate (MDP) and gallium-67-citrate lack specificity, while indium-111-leukocytes are laborious to prepare.
- There is a need for more effective and practical radiopharmaceuticals for assessing osteomyelitis.
Purpose of the Study:
- To evaluate the performance of two novel radiopharmaceuticals, 99mTc-PEG liposomes and 99mTc-HYNIC-IgG, in an experimental model of chronic osteomyelitis.
- To compare the diagnostic accuracy of these new agents against established methods like 99mTc-MDP, 67Ga-citrate, and 111In-granulocytes.
Main Methods:
- Chronic osteomyelitis was induced in rabbits by S. aureus inoculation in the femur.
- Rabbits were injected with 99mTc-PEG liposomes, 99mTc-HYNIC-IgG, 99mTc-MDP, 111In-granulocytes, or 67Ga-citrate.
- Scintigraphic imaging and histopathologic/microbiologic scoring were used to assess osteomyelitis localization and extent.
Main Results:
- Both 99mTc-PEG liposomes and 99mTc-HYNIC-IgG correctly identified all cases of osteomyelitis in the rabbit model.
- These novel agents performed comparably to 111In-granulocytes and 67Ga-citrate, outperforming 99mTc-MDP which missed one case.
- Radiography was only effective in visualizing severe osteomyelitis.
Conclusions:
- 99mTc-PEG liposomes and 99mTc-HYNIC-IgG demonstrated high efficacy in localizing chronic osteomyelitis in this experimental model.
- These agents offer potential advantages including ease of preparation, superior image quality, and reduced radiation dose compared to current standards.
- 99mTc-PEG liposomes and 99mTc-HYNIC-IgG represent promising alternatives for the scintigraphic evaluation of osteomyelitis.