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OpenTrials
Completed

NCT Number: NCT03562559

Skin to Adductor Canal Distance in Various Positions

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.

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Key information

Conditions

Knee Arthritis

Age range

18 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

University of British Columbia Hospital

Vancouver, British Columbia, V6T 2B5, Canada

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Measurements Using Ultrasound

Other

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.

Primary outcomes

  1. 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

Sponsors and collaborators

Lead sponsor

University of British Columbia

Other

Registry information

Official study title

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

Acronym: Skin to AC

Important dates

Study start
2018
Primary completion
2019
Study completion
2019
First posted
Jun 19, 2018
Registry last updated
Sep 27, 2019

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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