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Should single-phase radionuclide bone imaging be used in suspected osteomyelitis?
Abstract:
The records of 69 patients who had 86 delayed, static radionuclide bone images for suspected osteomyelitis were studied to determine the effects of this procedure on diagnosis and treatment. Sensitivity, specificity, and positive predictive value were lower than reported in several other studies. When osteomyelitis was unlikely, imaging was either negative or falsely positive and rarely affected treatment. In 46 cases where osteomyelitis was more likely, imaging potentially changed therapy in 19 but was unhelpful or misleading in 15. One third of the interpretations were "equivocal" and these were incorrect four times more often than "definite" readings. Two false-positive images led to unnecessary surgeries, and one patient with negative images died with unrecognized osteomyelitis. Static-phase images with "definite" interpretations, particularly when negative, are specific, but "equivocal" studies may lead to diagnostic and therapeutic errors. When osteomyelitis is improbable, imaging rarely changes diagnosis or therapy.
Insights
Static radionuclide bone imaging for suspected osteomyelitis has lower accuracy than previously reported. "Equivocal" results frequently lead to errors, impacting diagnosis and treatment decisions, especially when osteomyelitis is unlikely.
Area of Science:
- Nuclear Medicine
- Radiology
- Infectious Disease
Background:
- Osteomyelitis diagnosis often relies on imaging.
- Radionuclide bone imaging is a common diagnostic tool.
Purpose of the Study:
- To evaluate the diagnostic and therapeutic impact of delayed, static radionuclide bone imaging for suspected osteomyelitis.
- To assess the accuracy of imaging interpretations.
Main Methods:
- Retrospective review of 69 patients with 86 delayed, static radionuclide bone images.
- Analysis of imaging sensitivity, specificity, and predictive values.
- Evaluation of treatment changes based on imaging results.
Main Results:
- Lower sensitivity, specificity, and positive predictive value compared to other studies.
- Imaging rarely altered treatment when osteomyelitis was unlikely.
- In cases where osteomyelitis was more likely, imaging potentially changed therapy in 19/46 cases but was misleading in 15.
- One-third of interpretations were equivocal and incorrect four times more often than definite readings.
- False positives led to unnecessary surgeries; a false negative resulted in a delayed diagnosis and death.
Conclusions:
- Static-phase radionuclide bone imaging with definite interpretations can be specific, especially when negative.
- "Equivocal" interpretations are associated with significant diagnostic and therapeutic errors.
- Imaging is of limited value and rarely changes management when osteomyelitis is improbable.