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Knee replacement patients may use fewer opioids with new pain block

NCT ID NCT03747146

Symptom relief Sponsor: Hospital for Special Surgery, New York Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study compares two ways to manage pain after total knee replacement: a single-shot nerve block versus a continuous nerve block using a small catheter. About 94 adults having knee surgery will be randomly assigned to one method. The goal is to see which approach reduces opioid painkiller use and improves recovery.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
continuous adductor canal catheter with saline
What this could lead to
If successful, this could show that a continuous nerve block provides better pain relief and reduces opioid use after knee replacement surgery.
What could go wrong
This is a small, early-stage study with only 94 participants, so results may not apply to everyone. The intervention is a device and saline, not a new drug, so the impact is limited to pain management.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 94 people

The number the study aims to enrol. It can still change while the study runs.

Started

Nov 2018

Expected to finish

Dec 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 65 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients with osteoarthritis scheduled for a primary total knee arthroplasty with a participating surgeon * Planned use of regional anesthesia * Ability to follow study protocol * English speaking (secondary outcomes include questionnaires validated in English only) * Lives within one hour of the hospital * Has a smart phone Exclusion Criteria: * Hepatic or renal insufficiency * Younger than 18 years old or older than 65 years ol * Patients undergoing general anesthesia * Allergy or intolerance to one of the study medications * BMI \>40 * Diabetes * American Society of Anesthesiologists (ASA) status III or IV * Chronic gabapentin/pregabalin use (regular use for longer than 3 months) * Patients with chronic pain (from a referral to chronic pain service) or a pain catastrophizing scale (PCS \>30) * Patients with severe valgus deformity or flexion contracture * Patients unable to follow home catheter instructions and unwilling to go home with an infusing catheter * Patients who have no home caregivers in the event that a catheter is to be sent home with the patient * Patients with planned stay at rehab facility (to avoid medical device being tampered with at the rehab facility) * Non-English speakers (secondary outcomes include questionnaires validated in English only)

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Conditions

The condition(s) this trial relates to.

osteoarthritis

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Anesthesia

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Hospital for Special Surgery

    RECRUITING

    New York, New York, 10023, United States

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