Figure 1: Proliferation potential of cultured synovial cells in Group A (in which the synovium was harvested from the transitional zone between the articular cartilage and the synovial membrane at the femoral condyle) and Group B (in which the synovium was harvested from an area 5 mm medial to the transitional zone of the femoral condyle). The synovium from Group A exhibited a higher proliferation rate than did the synovium from Group B. (*, **, ***: P<0.05).