Skin to Adductor Canal Distance in Various Positions (Skin to AC)

September 24, 2019 updated by: Marcus Tholin, University of British Columbia

The Impact of Leg Movement on the Skin to Adductor Canal Distance: a Potential Cause for Catheter Displacement?

To control pain after total knee replacement surgery a catheter (tubing) is sometimes inserted into an anatomic space containing nerves that provide sensation to parts of the knee. This space is called the adductor canal.

The catheters often stop working before we remove them for unclear reasons. The investigators think this is because the catheters become dislodged from where it was meant to be. This could be due to repeated movements of the catheter tip brought on by patients contracting their leg muscles when they ambulate or perform physio.

The investigators want to confirm this by measuring the distance from a fixed spot on the patient's thigh to the adductor canal using an ultrasound machine. The leg will be measured in various positions to simulate muscle movements. A significant change in the distance could possibly contribute to catheter dislodgement and result in catheter failure.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Observational

Enrollment (Actual)

40

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Canada
    • British Columbia
      • Vancouver, British Columbia, Canada, V6T 2B5
        • University of British Columbia Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

We are recruiting patients undergoing total knee replacement. Per hospital protocol, patients will receive a spinal anesthetic and adductor canal block as part of their anesthetic regimen. After surgery, previously consented patients will have their skin to adductor canal distance measured by ultrasound in 5 different positions.

Description

Inclusion Criteria:

  • Patients over or equal to the age of 18 years old who can understand the study protocol and are able to give consent
  • Patients must be undergoing a primary total knee arthroplasty with neuraxial anaesthesia

Exclusion Criteria:

  • Patients with an allergy to ultrasound transducer gel or measuring tape

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
TKA Patients
Other: Measurements Using Ultrasound
Ultrasound measurements will be made in 5 positions. The ultrasound probe will be measuring from a fixed external location of the thigh. The 5 positions include: external rotation, neutral, manual tissue external rotation, straight leg raise at 30 degrees and hip/knee flexion at 90 degrees.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Skin to Adductor Canal Distance Disparity
Time Frame: Measurements will be made on the day of surgery, no other assessment or follow up needed
The largest distance disparity as measured from the 5 different leg positions
Measurements will be made on the day of surgery, no other assessment or follow up needed

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of British Columbia

Investigators

  • Principal Investigator: Jason Wilson, MD, University of British Columbia

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

April 1, 2018

Primary Completion (Actual)

January 1, 2019

Study Completion (Actual)

January 1, 2019

Study Registration Dates

First Submitted

May 29, 2018

First Submitted That Met QC Criteria

June 18, 2018

First Posted (Actual)

June 19, 2018

Study Record Updates

Last Update Posted (Actual)

September 27, 2019

Last Update Submitted That Met QC Criteria

September 24, 2019

Last Verified

September 1, 2019

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • H17-02633

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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