Intraoperative Direct vs Postoperative Ultrasound Guided Adductor Canal Nerve Block After Total Knee Arthroplasty

This study compares analgesic effect between two techniques of adductor canal nerve block after total knee arthroplasty. The first group of the patients will receive intraoperative adductor canal nerve block; and the other group post operative ultrasound guided adductor canal nerve block. Investigators will measure postoperative opioid consumption, pain management and rehabilitation goals.