Hip arthroplasty surgery is frequently performed on elderly patients in the community and it is associated with long-term postoperative hospital stays and high mortality.

Postoperative pain management is a multimodal process that includes intravenous and regional anesthesia methods. The ultrasound(US) guided erector spinae plane block (ESPB) is injected with a local anesthetic into the deep fascia of the erector spinae. In the literature, it has been reported that ESPB provides effective analgesia after a hip surgery. The fascia iliaca compartment block (FICB) is a safe method used for postoperative analgesia following hip, femoral, and knee surgeries.

The aim of this study is to compare US-guided FICB and ESPB for postoperative analgesia management after total hip prosthesis surgery.

Hip arthroplasty surgery is frequently performed on elderly patients in the community and it is associated with long-term postoperative hospital stays and high mortality. Severe postoperative pain may further reduce the limited cardiopulmonary capacity, especially in the elderly population. Postoperative effective pain treatment provides early mobilization and shorter hospital stay, thus complications due to hospitalization such as infection and thromboembolism may be reduced.

Postoperative pain management is a multimodal process that includes intravenous and regional anesthesia methods. Parenteral opioids are generally preferred in the management of acute postoperative pain. However, opioids have undesired adverse events such as nausea, vomiting, itching, sedation, and respiratory depression (opioid-related adverse events). Regional anesthesia techniques are frequently preferred as a part of multimodal analgesia in hip surgeries. Various methods may be performed to reduce the use of systemic opioids and for effective pain treatment. US-guided interfascial plane blocks have been used increasingly due to the advantages of ultrasound in anesthesia practice.

The ultrasound(US) guided erector spinae plane block (ESPB) is injected with a local anesthetic into the deep fascia of the erector spinae. Visualization of sonoanatomy with the US is simple and the spread of local anesthetic solution can be seen easily in the deep fascia of the erector spinae. Visualization of sonoanatomy in the US is easy, and the spread of local anesthetic agents can be easily seen under the erector spinae muscle. Thus, analgesia occurs in several dermatomes with cephalad-caudad way. Cadaveric studies have shown that the injection spreads to the ventral and dorsal roots of the spinal nerves. In the literature, it has been reported that ESPB provides effective analgesia after a hip surgery. The fascia iliaca compartment block (FICB) is a safe method used for postoperative analgesia following hip, femoral, and knee surgeries.

The aim of this study is to compare US-guided FICB and ESPB for postoperative analgesia management after total hip prosthesis surgery. The primary aim is to compare perioperative and postoperative opioid consumption and the secondary aim is to evaluate postoperative pain scores (VAS), and adverse effects related to opioids (allergic reaction, nausea, vomiting).

Inclusion Criteria:

• Patients with ASA classification I-III
• Aged 18-80 years
• Who will be scheduled for total hip prosthesis surgery under spinal anesthesia

Exclusion Criteria:

• Patients who have a history of bleeding diathesis
• Take anticoagulant therapy
• History of chronic pain before surgery
• Known local anesthetics and opioid allergy
• Pregnancy or lactation
• Infection at the site of block
• Patients who do not accept the procedure

Individual participant data (IPD) will not be shared

The patient and the outcomes assessor who performs postoperative pain evaluation will not know the group