- from 24 hs to 48 hs: ropivacaine 0.2%-methylprednisolone 1 mg/kg/die infusion (10ml/h) or saline 0.9% 10 ml/h in the wound. Rescue dose with morphine via intravenous PCA (0.5 mg/ml, bolus 1 mg, lock-out 5 min, max 20 mg in 4 hours) . from 48 hs to 7th day: ropivacaine 0.2% or saline 0.9% via patient controlled intralesional analgesia (PCIA) (2 mg/ml, bolus 20 mg, lock-out 60 min, max 80 mg in 4 hours). Rescue dose Tramadol 100 mg.