Perioperative care is similar in all patients and in all institutions. An independent physician will assess the patient postoperatively in each institution. Postoperative pain is evaluated with a visual analogue scale (VAS) from 1 to 10, with 1 being "the least" pain, 10 "the most" pain, on the day of surgery, on postoperative day 1, 2 (discharge) and at 1-month follow-up. Pain is also deduced from the assumption of pain relieving medications. Patients will receive pain medications only on demand and these will be given in incremental strength beginning with peripheral analgesics as Non-Steroidal Anti-Rheumatic agents (NSAR).