The role of bone scintigraphy in the evaluation of talar dome fractures.

We undertook a retrospective study of 122 patients with ankle pain to determine the accuracy of bone scintigraphy using 99mTc-methylene diphosphonate (MDP) for detection of osteochondral talar dome fractures (OCTDF). Plain radiographs, which were available in 97 patients, had not revealed any abnormality in the talar dome. Bone scintigraphy was followed by CT, which was considered to be the reference test in diagnosing OCTDF. Analysis of our data showed that when the bone scan findings in the two highest confidence categories (high and moderate probability) were accepted as abnormal, the sensitivity and the specificity of the test were 0.94 and 0.76, respectively. Although CT is mandatory to establish the stage of OCTDF, it cannot be used routinely due to its high cost. Bone scintigraphy appears to be a good screening procedure that will identify patients who are likely to benefit from further radiographic studies such as CT. These findings are subject to further confirmation in a prospective study.