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A major application of three-dimensional (3D) computed tomography (CT) is in the imaging of the skeleton. 3D CT has a potentially important role in determining the presence, type, and extent of fractures, especially of the calcaneus and pelvis. The objective of this study was to compare the diagnostic sensitivity and specificity of 3D CT, CT slices, and plain radiography in the detection and characterization of calcaneal and pelvic fractures. 3D CT reconstructions were obtained by two methods, surface reconstruction and volumetric techniques. Twenty-eight patients were imaged with CT, 3D CT, and plain radiography. The opinion of a musculoskeletal radiologist with access to all images plus clinical history, surgical findings, and follow-up findings was taken as truth. Four additional musculoskeletal radiologists read these cases in a blinded fashion and ranked the modalities with regard to perceived utility. Receiver operating characteristic analysis was used to determine the relative value of each modality in terms of diagnostic quality. All imaging modalities performed comparably in the diagnosis of fractures. CT slices and plain-films were the most useful for more difficult diagnostic tasks such as fracture stability, and the presence of comminution and estimation of the number of fragments. The results suggest that for skeletal areas with complicated anatomy (such as the pelvis and calcaneus), the diagnostic value of 3D CT is often equivalent to that of conventional methods.

Calcaneal and pelvic fractures: Diagnostic evaluation by three-dimensional computed tomography scans