Fracture of intercondylar eminence of the tibia has such clinical importances that may be neglected frequently after acute injury and will present extension lag and anterior instability unless adequate treatment is offered. According to Gronkvist, younger children will compensate somewhat for any anterior instrability as the skeletion grows, but in adults, some anterior instability will persist. The authers reviewed 20 cases of fracture of intercondylar eminence of the tibia over 20 years of age at the Department of Orthopedic Surgery of Seoul Paik Hospital for 3 years periods from February, 1987. until February, 1990. The results of this study were as follows. 1. The most common cause of the injury was traffic accident (15 cases, 75%). 2. Associated injuries in the same knee were rupture of medial collateral ligament, rupture of lateral meniscus, rupture of posterior cruciate ligament and fracture anound the same knee; Among them, rupture of medial collateral ligament was the most common. 3. According to Meyers and Mckeever classification, type II fracture of intercondylar eminence of the tibia was most common (9 cases, 45%). 4. All ten cases treated conservatively were obtained bone union, but three cases presented extension lag and anterior instability respectively. 5. All seven cases treated by surgical method were obtained bone union, but two cases presented extension lag and anterior instability respectively. 6. Two cases of nonunion treated by digging the fracture site, retightening the anterior cruciate ligament and fixing with pull out wire suture not only obtained bone union, but also remarkably reducing the extension lag and anterior instability at the same time.