The investigators are evaluating postoperative outcomes in patients undergoing hip replacement surgery performed with either spinal or general anesthesia, who also receive a suprainguinal fascia iliaca block using either perineural ropivacaine alone or ropivacaine combined with dexmedetomidine.
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Time of administration of first analgesic after the surgery
Timeframe: Time to first analgesic request, defined as the interval (in minutes) from block administration to the first request for rescue analgesia, assessed for up to 24 hours.