PURPOSE: The purpose of this study is to evaluate by arthroscopy the incidence of meniscal injury and the result of its treatment in fractures of the tibial plateau. MATERIALS AND METHODS: From March 2000 to July 2002, twenty-three patients with tibial plateau fractures were examined and treated by arthroscopy before reduction of the fractures. Following the classification by Schatzker, there were 3 pure cleavage fractures (type I), 7 with cleavage and depression (type II), 4 with pure central depression (type III), one medial condyle fracture (type IV) and 8 with meta-diaphyseal fractures (type VI). Meniscal injuries were treated by meniscectomy or meniscal repair. Second look arthroscopy for patients treated with meniscal repair were performed at 6 months after operation or at time of the fixative removal. RESULTS: Thirteen knees (56%) were found to have meniscal injuries. There were 11 lateral meniscal tears, eight of which were periphral and repaired. There were 3 complex lateral meniscal tears which required partial meniscectomy. The five medial meniscal tears were required all partial meniscectomy. Six of the eight patients who were repaired the meniscal tears evaluated by second look arthroscopy. Five patient showed complete healing and one showed incomplete healing. CONCLUSION: Every effort should be made to repair the meniscal tears in tibial plateau fractures.