The os calcis is the most frequently fractured than any other tarsal bone and the displaced intraarticular fracture account for 60-75% of them. Because of complex contour of calcaneus, it is difficult to evaluate the pattern of fracture exactuly by conventional roentgenograms. But recently, computed tomography clearly defines fracture patterns of subtalar joint and calcaneocuboid joint. From Feb. 1992 to Jan. 1994. we analyzed 18 feet in 16 patients of intraarticular calcaneal fractures after routine preoperative CT scan and Sandersclassification. All cases were operated through extensile lateral approach and internally fixed with plate and screws. The clinical and radiographic analysis were as follows:

1. Sanders classification of 18 cases were type I in 3, type I in 8, type III in 4 and type IV in 3.

2. As the fracture line moves medially, intraoperative visualization of joint, reduction becomes more difficult and the prognosis worsens in type II and IIIBC.

3. By SandersCT classification of calcaneal fracture, it help us in understanding fracture pattern more detail and in deciding of the method of treatment and in the predicting of the prognosis.