Fig. 2. Pain at the iliac crest at rest (  A ) and during motion (  B ) after 3 months in patients who received 0.2% ropivacaine or saline through the iliac crest catheter. VAS = visual analog scale from 0 = no pain to 100 = worst pain imaginable. Values are presented as mean ± SD. * Significant difference between the two groups (  P < 0.05).