Pain after hip surgery is a common problem in older adults and may delay early mobilization, increase the need for opioid pain medications, and contribute to complications such as delirium, nausea, or prolonged hospital stay. Regional anesthesia techniques are increasingly used to improve pain control while reducing the use of systemic opioids.

The pericapsular nerve group (PENG) block is a modern ultrasound-guided regional anesthesia technique designed to provide effective pain relief after hip surgery while preserving muscle strength. It allows patients to begin mobilization earlier and may reduce the risk of postoperative complications, which is particularly important in older adults.

Ropivacaine is a commonly used local anesthetic for nerve blocks. Dexmedetomidine is a medication that, when added in small doses to local anesthetics, may prolong pain relief and improve the quality of nerve blocks without significantly increasing side effects. However, the benefits and safety of adding dexmedetomidine to the PENG block in older adults have not been sufficiently studied.

The aim of this randomized controlled clinical study is to compare the effectiveness and safety of two PENG block techniques in older adults undergoing hip surgery. Participants will be randomly assigned to one of two groups. One group will receive a PENG block with 20 mL of 0.2% ropivacaine. The second group will receive a PENG block with 20 mL of 0.2% ropivacaine combined with 25 micrograms of dexmedetomidine.

The study hypothesis is that the addition of dexmedetomidine to ropivacaine in the PENG block will provide longer-lasting and more effective postoperative pain relief compared with ropivacaine alone, without increasing adverse effects. Outcomes assessed in the study will include postoperative pain intensity, need for additional pain medications, time to first mobilization, and the occurrence of side effects such as low blood pressure, slow heart rate, excessive sedation, or delirium.

The results of this study may help optimize regional anesthesia techniques for hip surgery in older adults and contribute to safer, more effective postoperative pain management strategies.

Postoperative pain following hip surgery is a significant clinical problem in older adults and is associated with delayed mobilization, increased opioid consumption, higher risk of delirium, and prolonged hospitalization. Effective pain control that preserves motor function is particularly important in this population to support early rehabilitation and reduce postoperative complications.

The pericapsular nerve group (PENG) block is an ultrasound-guided regional anesthesia technique that targets the sensory innervation of the anterior hip capsule while sparing motor nerves. This technique has been shown to provide effective analgesia after hip surgery and may facilitate early postoperative mobilization. However, the duration of analgesia achieved with local anesthetics alone may be limited.

Ropivacaine is a long-acting local anesthetic commonly used for peripheral nerve blocks. Dexmedetomidine is an alpha-2 adrenergic agonist that has been used as an adjuvant to local anesthetics to prolong analgesia and improve block quality. When administered in low perineural doses, dexmedetomidine may enhance analgesic duration without causing clinically significant systemic side effects. Nevertheless, data regarding its use as an adjuvant to the PENG block in older adults are limited.

This study is designed as a prospective, randomized, controlled clinical trial comparing two PENG block regimens in older adults undergoing hip surgery. Eligible participants will be randomly assigned to one of two groups. The control group will receive a PENG block with 20 mL of 0.2% ropivacaine. The intervention group will receive a PENG block with 20 mL of 0.2% ropivacaine combined with 25 micrograms of dexmedetomidine. The PENG block will be performed under ultrasound guidance by experienced anesthesiologists according to a standardized protocol.

All participants will receive standardized general or regional anesthesia for surgery and postoperative multimodal analgesia according to institutional protocols. Postoperative pain management will be identical in both groups, except for the study intervention, to minimize confounding factors.

The primary objective of the study is to assess whether the addition of dexmedetomidine to ropivacaine prolongs and improves postoperative analgesia provided by the PENG block compared with ropivacaine alone. Secondary objectives include evaluation of postoperative pain intensity, total opioid consumption, time to first mobilization, and patient comfort.

Safety outcomes will also be assessed, with particular attention to adverse effects relevant to older adults, including hypotension, bradycardia, excessive sedation, nausea, vomiting, and postoperative delirium. Hemodynamic parameters and sedation levels will be monitored routinely in the postoperative period.

The results of this study are expected to provide clinically relevant information on the efficacy and safety of dexmedetomidine as an adjuvant to the PENG block in older adults. These findings may contribute to the optimization of regional anesthesia strategies and improved postoperative pain management in this vulnerable population.

Inclusion Criteria:

• Age 65 years or older
• Scheduled for elective or emergency hip surgery (e.g., hip fracture fixation or hip arthroplasty)
• ASA physical status I-III
• Ability to communicate pain intensity using the NRS scale
• Written informed consent obtained from the patient or legal representative
• Planned use of PENG block as part of multimodal perioperative analgesia

Exclusion Criteria:

• Patient refusal or inability to provide informed consent
• Allergy, intolerance, or contraindication to any study medication: ropivacaine, dexmedetomidine
• Pre-existing neurological deficit or neuropathy of the affected limb
• Coagulopathy (INR >1.5, platelets <100,000/µL) or current therapeutic anticoagulation that contraindicates regional anesthesia
• Infection at or near the injection site
• Severe hepatic or renal impairment
• History of chronic opioid use (daily opioids >30 days before surgery)
• Cognitive impairment or delirium precluding reliable pain assessment
• BMI > 40 kg/m² (if you want to exclude for technical difficulty)
• Patients receiving another regional nerve block for hip surgery
• Pregnancy or breastfeeding
• Participation in another interventional clinical trial within 30 days

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