Value of a 24-hour image (four-phase bone scan) in assessing osteomyelitis in patients with peripheral vascular disease.
The delayed images of the four-phase 99mTc phosphonate bone scan are compared with the delayed images of the three-phase study in patients with diabetes mellitus and/or peripheral vascular disease and suspected osteomyelitis. Three-phase bone imaging includes an immediate postinjection radionuclide angiogram, a blood-pool image, and delayed static images to 7 hr. The four-phase study adds a 24-hr static image. The scan is positive for osteomyelitis if images show progressively increasing lesion to background activity ratios over time. The results of analyzing 21 three- and four-phase bone scans in 17 patients were correlated with clinical course, cultures, and/or x-rays, gallium scans, and CT scans. The accuracy of four-phase bone imaging for diagnosing osteomyelitis was 85%; for three phase, 80%. Sensitivity for four phase was 80%; specificity was 87%. Sensitivity for three phase was 100%; specificity was 73%. Since overall accuracy of the four-phase study is slightly better than three phase, in these patients with diabetes mellitus and/or peripheral vascular disease, the addition of a 24-hr image, creating a four-phase bone scan, is recommended.
Alazraki
N
N
Dries
D
D
Datz
F
F
Lawrence
P
P
Greenberg
E
E
Taylor
A
A
D003925:Diabetic Angiopathies / Q000150:complications*; D004164:Diphosphonates; D006801:Humans; D007866:Leg / Q000098:blood supply; D007871:Leg Ulcer / Q000150:complications*; D010019:Osteomyelitis / Q000150:complications / Q000000981:diagnostic imaging*; D011877:Radionuclide Imaging; D013667:Technetium; D013669:Technetium Tc 99m Medronate / Q000031:analogs & derivatives; D013997:Time Factors; D014689:Venous Insufficiency / Q000150:complications*
D004164:Diphosphonates; C024226:technetium Tc 99m hydroxymethylene diphosphonate; D013667:Technetium; D013669:Technetium Tc 99m Medronate