Postoperative analgesia and functional recovery after total-knee replacement: comparison of a continuous posterior lumbar plexus (psoas compartment) block, a continuous femoral nerve block, and the combination of a continuous femoral and sciatic nerve block. - Morin,AM.; Kratz,CD.; Eberhart,LH.; Dinges,G.; Heider,E.; Schwarz,N.; Eisenhardt,null.; Geldner,G.; Wulf,H.. (Reg Anesth Pain Med., 2005)