Functional bone imaging in the detection of ischemic osteopathies

Area of Science:

• Nuclear Medicine
• Radiology
• Orthopedics

Background:

• Ischemic osteopathies encompass conditions like avascular necrosis and osteochondritis, often resulting from trauma, Perthes disease, dysbarism, or immunosuppressive therapy.
• Early and accurate diagnosis of ischemic osteopathy is crucial for effective management and preventing long-term complications.

Purpose of the Study:

• To evaluate the diagnostic efficiency and accuracy of a specific functional imaging technique over a 10-year period for detecting ischemic osteopathies.
• To assess the sensitivity, specificity, and predictive accuracy of accretion rate functional imaging compared to static bone scans.

Main Methods:

• A retrospective review of 327 patients diagnosed with or suspected of having ischemic osteopathy.
• Intravenous injection of Technetium-99m hydroxydiphosphonate (Tc-99m HDP) followed by early (20 minutes) accretion rate functional imaging and delayed (3 hours) static bone scans.
• Correlation of imaging findings with definitive clinical and radiological diagnoses of avascular necrosis or osteochondritis.

Main Results:

• The accretion rate functional imaging demonstrated high diagnostic performance with an overall predictive accuracy of 97%.
• The technique achieved a sensitivity of 98% and a specificity of 96%, with only 8 false-positive and 2 false-negative results among 327 patients.
• Positive accretion rate images were observed in 114 patients, while 213 showed negative results.

Conclusions:

• Accretion rate functional imaging using Tc-99m HDP is a valuable and accurate predictive diagnostic indicator for ischemic osteopathies.
• The technique's high sensitivity and specificity support its utility in the early detection and diagnosis of avascular necrosis and osteochondritis.