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Background and Aims The aim is to evaluate the antinociceptive efficacy of pericapsular blocks (PENG-Pericapsular Nerve Group or iliopsoas), residual motor block and functional recovery time after performing these blocks.

Methods Prospective study, comparing 30 patients scheduled for lower extremity surgery between May and June 2021: femoral osteosynthesis, total hip and knee arthroplasty. . Data on the intensity of pain after performing three types of blocks were collected: PENG (pericapsular nerve block), iliofascial and femoral (active control) and comparison was made with cases where no block was performed (passive control). The variables analyzed were: intensity of pain prior to the intervention, type of block performed, degree of motor and sensory block at 24 hours, intensity of pain in the 24 hours postoperatively, duration of the analgesic effect, and need for rescue analgesia. In all cases the same anesthetic technique and perioperative multimodal analgesia were applied.

Results The PENG block was associated with less motor block at 24 hours. All of them presented a decrease in pain intensity 24 hours after performing the block compared to the previous one. There were no complications attributable to the technique. No significant differences were found between PENG and iliopsoas blocks. Compared with the femoral block, 50% of patients who underwent this block presented motor block 24 hours after the intervention. All of them also experienced a decrease in pain intensity at 24 hours.

Conclusions The use of pericapsular blocks in hip surgery allow an adequate analgesia that reduces the use of anti-inflammatories and opioids without affecting functional recovery.

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