The Applicable Value Of 3d Reconstruction With Spiral Ct In Calcaneal Fractures

Objective To investigate the characteristics of calcaneal fractures with spiral CT multiplanar volume reconstruction (MPVR),surface shaded display (SSD), and to determine the value of MPVR and SSD in the diagnosis of calcaneal fractures.Materials and Methods Patients suspected or diagnosed with calcaneal fracture were imaged conventional scans with SCT, then 47 fractures diagnosed with intraarticular calcaneal fracture were farther postprocessed with the techniques of MPVR and SSD to classify the fractures and to show the condition of involvement of joints and the numbers of fragments and so on.Results Tuberosity slice showed the most involvement of articular facets in all cases. Coronal slice was superior to showing the medial and postenrior facets while involvment of the calcaneo-cuboid facets were defined most clearly in axial and tuberosity slice. The number of fragments was determined most reliably on the basis of the sagital reconstructions.The SSD version offered the spatial allocation of the individual slices, and well evaluated preoperatively the degree of joint injury and depression. Little displacement (only three fractures) of sustentaculum tali occurred. The severity of articular incongruity and rotational displacement of the posterior facet fragments were not well appreciated in coronal CT images of 11 fractures. Soft tissue abnormalities such as peroneal tendon could be clearly detected.Conclusion Spiral CT SSD and MPVR have important value in the diagnosis of calcanenl fracture, they play an important role in the preoperative classification of calcaneal fractures, and are useful for the selection of surgical approaches, and for the evaluation of prognosis.