Active — Not RecruitingNot Applicable

Proximal Spread in Adductor Canal Block(ACB)

Turkey (Türkiye)68 participantsStarted 2026-04-07

Plain-language summary

This prospective, randomized clinical study is designed to evaluate the effects of two different injection levels of adductor canal block (ACB) on the proximal spread of local anesthetic and clinical outcomes in patients undergoing total knee arthroplasty. The study will be conducted at Ankara Etlik City Hospital and will include a total of 68 patients. All cases are limited to unilateral elective knee replacement surgeries performed under spinal anesthesia. In this study, the comparison will be based on the application of adductor canal block at two distinct injection levels. In both groups, blocks will be performed under ultrasound (USG) guidance using the same technical principles and standardized conditions; in the first group, the block will be administered at the level where the vasto-adductor membrane is first visualized, while in the second group, it will be performed at the level where the adductor longus ends. The type, concentration, and volume of local anesthetic used in both groups will be standardized as 20 mL of 0.25% bupivacaine. The groups will be compared in terms of the proximal spread of the local anesthetic based on the injection level, the area of spread at the apex of the iliopectineal fossa, the involvement of the femoral nerve, the incidence of postoperative falls, and analgesic consumption.

Who can participate

Age range

18 Years – 80 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Inclusion Criteria: * \* Patients aged \> 18 years. * ASA physical status classification I-III. * Patients scheduled for elective, unilateral total knee arthroplasty (TKA). * Planned administration of spinal anesthesia. * Ability to provide written informed consent. Exclusion Criteria:Scheduled for bilateral knee arthroplasty. * Known hypersensitivity or allergy to local anesthetics. * History of chronic pain syndrome or regular opioid consumption. * Presence of peripheral neuropathy or neurological disorders affecting the femoral nerve. * Coagulopathy or ongoing anticoagulant therapy. * Active infection at the site of injection. * Inability or refusal to provide written informed consent.

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Proximal spread of local anesthetic

Timeframe: The first postoperative hour

Trial details

NCT IDNCT07595471

SponsorAnkara Etlik City Hospital

Sponsor typeOTHER_GOV

Study typeINTERVENTIONAL

Primary completion2026-05-30

View on ClinicalTrials.gov More Total Knee Anthroplasty trials