The Analgesic effect of adding ultrasound-guided pericapsular nerve group block to suprainguinal fascia iliaca compartment block for hip fracture surgery: A prospective randomized controlled trial

BACKGROUND: Both suprainguinal ultrasound-guided fascia iliaca compartment block (FICB) and pericapsular nerve group (PENG) block have been used to treat pain after hip surgery. Motor-sparing PENG block may further expedite early postoperative rehabilitation. This study aimed to compare the analgesic efficacy and recovery outcome of suprainguinal ultrasound-guided FICB alone with FICB combined with PENG block for hip fracture surgery. METHODS: In this study, 59 elderly patients undergoing hip fracture surgery were randomized to receive either FICB alone or combined FICB + PENG block. The primary outcome was pain score at rest 12 hours after surgery as measured by the numerical rating scale (NRS, 0–10) and secondary outcomes were pain scores at rest and with movement measured at other time points within 48 hours, time to first sit up without pain, rescue morphine requirements, opioid-related side effects, incidence of delirium, in-hospital morbidities and mortality, and length of hospital stay. RESULTS: Both patient groups had similar demographic profile and postoperative pain scores at rest and with movement. Median NRS pain scores at rest between FICB alone or combined FICB + PENG block at 4, 8, 12, 24, 36 and 48 hours after surgery were 3 versus 3 (P = .31), 3 versus 3 (P = .21) and 3 versus 3 (P = .69), 2 versus 2 (P = .35), 2 versus 3 (P = .17), 3 versus 2 (P = .18) respectively and NRS during movement at 12, 24, 48 hours were 10 versus 8 (P = .30), 6 versus 5 (P = .54) and 3.5 versus 2.0 (P = .64), respectively. There was also no significant difference in the time for patients to first sit up without pain (17.50 vs 19.37 hours vs h; P = .058) or any other secondary outcome measures. The procedure time was, however, significantly longer for the FICB + PENG block (10 vs 5 minutes, P < .001). CONCLUSION: Addition of ultrasound-guided PENG block to FICB did not improve postoperative analgesic or recovery outcomes in elderly patients undergoing hip fracture surgery.