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Hip arthroscopy is a surgical procedure growing in popularityThe optimal approach to postoperative analgesia has not been identifiedThe addition of preoperative fascia iliaca block using ropivacaine to the intraarticular injection of ropivacaine did not improve early postoperative pain scoresThe fascia iliaca blocks also did not improve most secondary endpoints, although they did cause quadriceps weaknessAmbulatory hip arthroscopy is associated with postoperative pain routinely requiring opioid analgesia. The potential role of peripheral nerve blocks for pain control after hip arthroscopy is controversial. This trial investigated whether a preoperative fascia iliaca block improves postoperative analgesia.In a prospective, double-blinded trial, 80 patients scheduled for hip arthroscopy were randomized to receive a preoperative fascia iliaca block with 40 ml ropivacaine 0.2% or saline. Patients also received an intraarticular injection of 10-ml ropivacaine 0.2% at procedure end. Primary study endpoint was highest pain score reported in the recovery room; other study endpoints were pain scores and opioid use 24 h after surgery. Additionally, quadriceps strength was measured to identify leg weakness.The analysis included 78 patients. Highest pain scores in the recovery room were similar in the block group (6 ± 2) versus placebo group (7 ± 2), difference: −0.2 (95% CI, −1.1 to 0.7), as was opioid use (intravenous morphine equivalent dose: 15 ± 7mg [block] vs. 16 ± 9 mg [placebo]). Once discharged home, patients experienced similar pain and opioid use (13 ± 7 mg [block] vs. 12 ± 8 mg [placebo]) in the 24 h after surgery. The fascia iliaca block resulted in noticeable quadriceps weakness. There were four postoperative falls in the block group versus one fall in the placebo group.Preoperative fascia iliaca blockade in addition to intraarticular local anesthetic injection did not improve pain control after hip arthroscopy but did result in quadriceps weakness, which may contribute to an increased fall risk. Routine use of this block cannot be recommended in this patient population.