Skin to Adductor Canal Distance in Various Positions

NCT03562559 | Completed Results

• 1 other identifier: H17-02633
• Study Type: observational
• Target: 40
• Locations: 1 country
• Sites: 1

Brief Summary

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.

Conditions

Knee Arthritis

Keywords

Total Knee Arthroplasty; Adductor Canal Block

Outcome Measures

Primary Outcomes (1)

• Skin to Adductor Canal Distance Disparity

  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

Study Arms (1)

TKA Patients

Other: Measurements Using Ultrasound

Interventions

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.

TKA Patients

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)
• 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.

You may qualify if:

• 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

You may not qualify if:

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

Sponsors & Collaborators

• University of British Columbia: lead

Study Sites (1)

University of British Columbia Hospital

Vancouver, British Columbia, V6T 2B5, Canada

Location

Related Publications (1)

• Tholin M, Wilson J, Lee S, Tang R, Sawka A, Vaghadia H. Impact of leg movement on skin-adductor canal distance: a potential cause for catheter tip displacement? Can J Anaesth. 2020 Aug;67(8):936-941. doi: 10.1007/s12630-020-01693-6. Epub 2020 May 8.

  PMID: 32385824 DERIVED

Results Point of Contact

• Title: Marcus Tholin
• Organization: Vancouver General Hospital

marcus.tholin@vch.ca

604-875-4111

Study Officials

• Jason Wilson, MD

  University of British Columbia

  PRINCIPAL INVESTIGATOR

Publication Agreements

• PI is Sponsor Employee: Yes

Study Design

• Study Type: observational
• Observational Model: CASE ONLY
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Principal Investigator

Study Record Dates

• First Submitted: May 29, 2018
• First Posted: June 19, 2018
• Study Start: April 1, 2018
• Primary Completion: January 1, 2019
• Study Completion: January 1, 2019
• Last Updated: September 27, 2019
• Results First Posted: September 27, 2019

Record last verified: 2019-09

Data Sharing

• IPD Sharing: Will not share

Locations

CA (1)