NCT06185608

The Effects of Various Concentrations of Ropivacaine on the Onset and Duration of Ankle Blocks

The Effects of Various Concentrations of Ropivacaine on the Onset and Duration of Ultrasound-guided Ankle Blocks in Patients Undergoing Hallux Valgus Repair Surgery - a Randomized, Double-blinded, Parallel-group Interventional Study

• Status: Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 174 (estimated)
• Sponsor: Ziekenhuis Oost-Limburg · Academic / Other
• Sex: All
• Age: 18 Years – 75 Years
• Healthy volunteers: Not accepted

Summary

Peripheral nerve blocks are essential in ensuring effective regional anesthesia and postoperative analgesia in forefoot surgery for hallux valgus repair, with or without minor concomitant toe procedures. Many factors influence the onset and duration of peripheral nerve blocks. In the advent of ultrasound-guided nerve blocks, the accuracy in administering LA has significantly improved, potentially reducing the required dosage, which is also associated with less risk for toxicity. However, the effect of the concentration of LA on the onset time and duration of ultrasound-guided ankle blocks for forefoot surgery has not yet been studied. This poses a clinically relevant dilemma regarding the necessity of administering lower or higher concentrations of ropivacaine to achieve a clinically relevant faster onset time and longer duration of an ankle block.

Detailed description

This study aims to evaluate the differential effects of 0.25%, 0.5%, and 1% ropivacaine on the onset time and duration of ultrasound-guided ankle blocks in patients having forefoot surgery for anesthesia and postoperative analgesia. We hypothesize that the use of 1% ropivacaine for ultrasound guided ankle blocks will result in a significantly faster onset time and a longer sensory block duration, and thus analgesia, compared to the use of 0.25% and 0.5% ropivacaine in patients having forefoot surgery. The primary outcome is the difference in the duration of the sensory blocks. The secondary outcomes are the difference in onset time of the sensory block, motor function, the postoperative pain scores, opioid consumption, and proportion of failed blocks.

Conditions

• Hallux Valgus
• Anesthesia

Interventions

Type	Name	Description
DRUG	0.25% ropivacaine	A total of 15 ml of 0.25% ropivacaine will be administered and distributed strategically among the specific nerves: 6 ml for the tibial nerve, 3 ml for the deep peroneal nerve, and 2 ml each for the superficial peroneal nerve, saphenous nerve, and sural nerve.
DRUG	0.5% ropivacaine	A total of 15 ml of 0.5% ropivacaine will be administered and distributed strategically among the specific nerves: 6 ml for the tibial nerve, 3 ml for the deep peroneal nerve, and 2 ml each for the superficial peroneal nerve, saphenous nerve, and sural nerve.
DRUG	1% ropivacaine	A total of 15 ml of 1% ropivacaine will be administered and distributed strategically among the specific nerves: 6 ml for the tibial nerve, 3 ml for the deep peroneal nerve, and 2 ml each for the superficial peroneal nerve, saphenous nerve, and sural nerve.

Timeline

• Start date: 2025-05-22
• Primary completion: 2027-05-01
• Completion: 2027-10-01
• First posted: 2023-12-29
• Last updated: 2026-03-24

Locations

1 site across 1 country: Belgium