Single-injection femoral nerve block with 0.25% ropivacaine or 0.25% bupivacaine for postoperative analgesia after total knee replacement or anterior cruciate ligament reconstruction - de Lima E Souza, R; Correa, C H; Henriques, M D; de Oliveira, C B; Nunes, T A; Gomez, R S (J Clin Anesth, 2008)