Figure 1. Comparison of the visual analog scale values during continuous passive motion (CPM) of the three groups at (A) 24 h and (B) 48 h. The box represents the 25th-75th percentiles; the dark line is the median; the extended bars represent the 10th-90th percentiles, and the circles represent values outside this range. *P < 0.01 versus continuous femoral block (CFB) and continuous epidural infusion (CEI).