Skin to Adductor Canal Distance in Various Positions

NCT ID: NCT03562559

Last Updated: 2019-09-27

Study Results

Results available

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Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

40 participants

Study Classification

OBSERVATIONAL

Study Start Date

2018-04-01

Study Completion Date

2019-01-01

Brief Summary

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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.

Detailed Description

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Conditions

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Knee Arthritis

Study Design

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Observational Model Type

CASE_ONLY

Study Time Perspective

CROSS_SECTIONAL

Study Groups

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TKA Patients

Measurements Using Ultrasound

Intervention Type 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.

Interventions

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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.

Intervention Type OTHER

Eligibility Criteria

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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
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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University of British Columbia

OTHER

Sponsor Role lead

Responsible Party

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Marcus Tholin

Principal Investigator

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Jason Wilson, MD

Role: PRINCIPAL_INVESTIGATOR

University of British Columbia

Locations

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University of British Columbia Hospital

Vancouver, British Columbia, Canada

Site Status

Countries

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Canada

References

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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.

Reference Type DERIVED
PMID: 32385824 (View on PubMed)

Provided Documents

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Document Type: Study Protocol and Statistical Analysis Plan

View Document

Other Identifiers

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H17-02633

Identifier Type: -

Identifier Source: org_study_id

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