2003 - Vol. 53 / Issue 2                                        
                                        
                                Postoperative analgesia following orthopedic surgery: a study comparing perivascular lumbar plexus inguinal block with ropivacaine (3 in 1) and spinal anesthesia with morphine
                Neuber Martins Fonseca; Roberto Araújo Ruzi; Fernando Xavier Ferreira; Fabrício Martins Arruda