The os calcis is one of the most commonly injured tarsal bone and fractures involving the subtalar joint may cause serious and persistent disabilities. We treated 12 intra-artlcular calcaneal fractures in 11 patients from June, 1998 to April, 1992 by plate fixation after lateral approach. The Sanders fracture classification system was applied to out study which classify the fractures according to the number of the fractured segments and direction of the fracture lines after computerized axial tomography of the posterior facetal joint. The follow-up evaluation included questioning the patient about pain during activity and rest, the ability to walk and stand, range of subtalar motion and ability to return to work according to the assessment sheet for calcaneal fractures of Creighton Nebraska Health Foundationl We experienced 8 excellent and 2 good results among 12 cases and there was little complication.