Nuclear medicine and the failed joint replacement: Past, present, and future

Area of Science:

• Orthopedics
• Nuclear Medicine
• Radiology

Background:

• Radionuclide imaging, including bone scans, was initially used for prosthetic joint evaluation but lacked specificity.
• Advances in cross-sectional imaging improved diagnosis of mechanical failures but not infection.
• Nuclear medicine shifted focus to diagnosing prosthetic joint infection, leading to combined imaging techniques.

Purpose of the Study:

• To provide a comprehensive review of the evolution of nuclear medicine imaging in the context of joint replacements.
• To highlight the diagnostic challenges and advancements in identifying prosthetic joint complications, particularly infection.

Main Methods:

• Review of historical and current nuclear medicine imaging modalities for prosthetic joints.
• Discussion of bone scintigraphy, gallium imaging, leukocyte/bone, and leukocyte/marrow imaging.
• Exploration of newer techniques including FDG-PET, antimicrobial peptides, SPECT/CT, and Fluoride-PET.

Main Results:

• Labeled leukocyte imaging with bone marrow imaging is currently the most accurate test (approx. 90%) for diagnosing infected joint arthroplasty.
• Despite limitations, in-vivo leukocyte labeling and FDG-PET have been investigated for infection diagnosis.
• Hybrid SPECT/CT and Fluoride-PET show promise for evaluating mechanical issues and bone metabolism, potentially shifting the diagnostic paradigm again.

Conclusions:

• Nuclear medicine imaging has significantly evolved, with labeled leukocyte imaging being a key tool for prosthetic joint infection.
• Newer hybrid imaging techniques like SPECT/CT and PET offer improved anatomical detail and metabolic insights.
• The field continues to advance, seeking more accurate and specific methods for diagnosing prosthetic joint complications.