PURPOSE : In the proximal tibial condylar fractures, the authors analyzed the treatment results clinically and radiologically, after arthroscopically assisted accurate anatomical reduction of articular surface and rigid internal fixation with early mobilization. MATERIALS AND METHODS : We reviewed 56 cases of tibial condylar fracture that were treated at our the orthopaedic department between January 1990 and December 1996 and the follow-up period was 1 year above. According to Schatzker's classifications, we classified the type of fracture and we analyzed the results by average union time and Porter's criteria after accurate anatomical reduction of articular surface and rigid assisted redcution of articular surface and internal fixation. RESULTS : According to Schatzker's classification, Type I 15cases, TypeII 14cases, TypeIII 6 cases, TypeIV 7cases, TypeV 3cases, TypeVI 11cases, Associated soft tissue injuries were total 22cases the were MCL injuries 12 cases, lateral meniscal injuries 6 cases. The average union time was 15.5 weeks and by Porter's criteria, 56 cases, of which 39 cases(71%) had an good result. CONCLUSION : we considered that good results can be obtained by assistant use of arthroscopy and rigid internal fixation with early mobilization, that accurate diagnosis and appropriate treatments of accampaning injuries according to the type of fractures, and accurate anatomical reduction of articualr surface.