The tibial plateau fracture which involving articular surface of the proximsl tibia is very common in pedestrian injury of the traffic accident and sometimes results in significant disability in knee joint function. The authors analized 40 cases of the tibial plateau fracture treated in our depsrtment during the year 1980 through 1985. The results obtained are as follows : l. 15 cases were treated by conservative methods. 2. 25 cases were treted by operative methods. 3. 33 cases(82.5%) were “Acceptable” group according to Roberts criteria.