 60 patients being treated for ACL repair or knee arthroplasties under regional anesthesia will be randomized to three groups: Fascia Iliaca Block FIB, Femoral Block FB with stimulating catheter or FB without stimulating catheter. A catheter will be placed according to each technique, before the surgery. A bolus of local anesthetic will be given pre-surgery and at the end of the operation, in all groups. A continuous infusion will be started for 48 hours. All patients receive a standard analgesia cocktail and rescue medication. 