{
  "abstract": "Background and Aims The pericapsular nerve group (PENG) block has been proposed as an effective motor-sparing option for total hip arthroplasty (THA). The PENG block specifically targets the anterior hip capsule. However, it remains unclear whether the combination of a deep-piriformis compartment (DPC) block, which targets the posterior hip capsule, could enhance analgesia in patients undergoing THA.Methods We conducted a randomized, observer-blinded trial. One hundred patients undergoing THA were randomly assigned to either the PENG group or the PENG+DPC group, with 50 patients in each group. Before undergoing general anesthesia, patients in PENG group received PENG and lateral femoral cutaneous nerve (LFCN) block, while those in PENG+DPC group received PENG, LFCN and DPC block. The primary outcome was the static pain score at 6 hours post-surgery.Results The static pain score at 6 hours post-surgery was lower in the PENG+DPC group (0 [0–1]) than that in the PENG group (1 [0–2]) with a median difference of 0 (95% confidence interval, 0–1; P=0.009). Similarly, the dynamic pain score at 6 hours post- surgery, the static and dynamic pain score at 1 hour post-surgery, intraoperative sufentanyl consumption and the total consumption of sufentanyl were lower in the PENG+DPC group. There were no significant differences in pain scores at other time points, motor blockade or other postoperative outcomes. No nerve block-related complications were reported during the trial.Abstract OP48 Figure 1Images of ultrasound-guided deep-piriformis compartment (DPC) block. (A) Anatomical schematic; (B) The ultrasound imaging when probe is positioned at site of blue rectangle in A; (C) The ultrasound imaging when probe is moved to the site of yellow rectangle in A; (D) The ultrasound imaging when probe is positioned at site of black rectangle in A. The needle is introduced in-plane from inferior-medial to superior-lateral until the tip contacts the iliac bone. FT, greater trochanter; GMax, gluteus maximus; PM, piriformis; PAR: posterior acetabular rim; FN, femoral neck; FH, femoral head; LBGSF, lateral brim of greater sciatic foramen; TC, triceps femorisConclusions Incorporating a DPC block into the PENG block could enhance analgesia in patients undergoing THA without additional adverse effects .",
  "authors": [
    {
      "affiliations": [
        "Department of Anesthesiology, Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University, Shanghai, China"
      ],
      "name": "Aizhong Wang"
    }
  ],
  "title": "OP48 The complementary analgesic efficacy of the deep-piriformis compartment block to pericapsular nerve group block for primary total hip arthroplasty: a prospective randomized, observer-blinded trial",
  "uid": "93155a5e-21e5-58a6-ba5b-e7f8b1ff88ea"
}