Radionuclide imaging in orthopedic infections

Area of Science:

• Nuclear Medicine
• Radiology
• Orthopedics

Background:

• Three Phase Bone Scintigraphy is sensitive for osteomyelitis in normal bone.
• Specificity decreases with underlying osseous abnormalities.
• Various advanced scintigraphic techniques aim to improve diagnostic accuracy.

Purpose of the Study:

• To review techniques, strategies, and limitations of nuclear medicine imaging for osteomyelitis.
• To compare the utility of different scintigraphic modalities in specific clinical scenarios.
• To provide guidance on selecting appropriate imaging for suspected osteomyelitis.

Main Methods:

• Discussion of bone scintigraphy, bone/gallium scintigraphy, leukocyte imaging, and leukocyte/bone and leukocyte/marrow studies.
• Analysis of imaging findings in vertebral osteomyelitis, diabetic foot infections, and painful joint replacements.
• Evaluation of diagnostic specificity and limitations of each technique.

Main Results:

• Labeled leukocyte imaging is less valuable for vertebral osteomyelitis; bone/gallium imaging is preferred.
• Bone/gallium imaging enhances specificity and detects soft tissue infection in spinal osteomyelitis.
• Leukocyte imaging is sufficient for forefoot osteomyelitis; combined techniques may be needed for midfoot/hindfoot.
• Leukocyte/marrow imaging may help assess uptake in neuropathic joints.
• Leukocyte/marrow scintigraphy is recommended initially for infected joint replacements; bone scintigraphy is a good initial screen for any complication.

Conclusions:

• No single scintigraphic study is universally optimal for diagnosing osteomyelitis.
• Technique selection depends on the clinical context, including location and patient factors.
• Advanced imaging modalities significantly improve diagnostic specificity in complex cases of osteomyelitis.