The goal of this observational study is to learn about the analgesic efficacy and postoperative recovery of two locoregional anesthesia combinations in patients \> 18 years (ASA I-III), scheduled for unilateral TKA under spinal anesthesia with expected hospitalization \> 24 hours: * ACB + sacral ESP block * ACB + iPACK block The main question it aims to answer is: Does the ACB + sacral ESP block combination produce effective postoperative recovery and analgesic effect? Participants already taking ACB + sacral ESP block as part of their regular peri-operative care for TKA will be followed in the postoperative period for 48 hours.