For this group, after the surgical procedure is completed, the patient will be placed in a lateral position with the operated side facing up, and a QIPB will be performed. With the patient in the lateral position, the spinous process of the L3 vertebra will first be imaged with an ultrasound probe positioned transversely in the midline. Then, by slightly shifting the probe laterally, the transverse process of the vertebra will be visualized within the erector spinae muscle. The probe will then be rotated in the sagittal plane and advanced caudally about 1 cm, visualizing the crista iliaca. On the cranial side of the crista iliaca, the erector spinae muscle, quadratus lumborum, and psoas major muscles will be visualized sequentially. With the needle direction cranial to caudal, the crista iliaca will be gently touched, and the needle will be positioned between the erector spinae and the quadratus lumborum muscle. After injecting 40 ml of 0.25% bupivacaine, the needle will be injected.

Probe Placement: A high-frequency linear ultrasound probe is placed in a sagittal orientation over the Anterior Superior Iliac Spine (ASIS) and then moved medially.

Anatomical Landmark: The key visual target on the ultrasound screen is the "bowtie" sign, which is formed by the junction of the sartorius and internal oblique muscles over the iliacus muscle.Injection Point: The target for injection is the potential space located directly beneath the fascia iliaca (seen as a bright, hyperechoic line) and superficial to the iliacus muscle.Needle Insertion: The block needle is advanced using an "in-plane" technique (parallel to the probe's long axis), typically from a caudal-to-cranial direction (from bottom to top).Injection: After confirming correct needle tip placement with hydrodissection (visualizing fluid separating the fascia from the muscle), 30-40 mL of local anesthetic is slowly injected. The spread of the anesthetic proximally (upward) beneath the fascia is monitored in real-time

40 mL of 0.25% bupivacaine

Numerical rating scale is used for pain assessment. The scores of the numerical rating scale changes between 0 to 10 points. 10 points mean "the most severe pain that the patient ever had". 0 point means "there is no pain." Higher scores mean worse outcome.

Postoperative total analgesic need was recorded as "milligram" in unit.