Knee Arthritis
Conditions
Keywords
Total Knee Arthroplasty, Adductor Canal Block
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.
Interventions
OTHERMeasurements 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.
Sponsors
University of British Columbia
Study design
Observational model
CASE_ONLY
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Skin to Adductor Canal Distance Disparity | 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 |
Countries
Canada
Participant flow
Recruitment details
Patients older than 18 years of age undergoing elective total knee arthroplasty who were able to give informed consent
Participants by arm
| Arm | Count |
|---|---|
| TKA Patients 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. | 40 |
| Total | 40 |
Baseline characteristics
| Characteristic | TKA Patients | — |
|---|---|---|
| Age, Categorical <=18 years | 0 Participants | — |
| Age, Categorical >=65 years | 22 Participants | — |
| Age, Categorical Between 18 and 65 years | 18 Participants | — |
| Age, Continuous | 67.6 years | — |
| Race and Ethnicity Not Collected | — | — Participants |
| Region of Enrollment Canada | 40 Participants | — |
| Sex: Female, Male Female | 17 Participants | — |
| Sex: Female, Male Male | 23 Participants | — |
Adverse events
| Event type | EG000 affected / at risk |
|---|---|
| deaths Total, all-cause mortality | 0 / 0 |
| other Total, other adverse events | 0 / 0 |
| serious Total, serious adverse events | 0 / 0 |
Outcome results
Primary
Skin to Adductor Canal Distance Disparity
The largest distance disparity as measured from the 5 different leg positions
Time frame: Measurements will be made on the day of surgery, no other assessment or follow up needed
| Arm | Measure | Group | Value (MEAN) |
|---|---|---|---|
| TKA Patients | Skin to Adductor Canal Distance Disparity | Neutral vs manual displacement distance (cm) | 1.01 centimeters |
| TKA Patients | Skin to Adductor Canal Distance Disparity | Neutral vs external rotation distance (cm) | 0.28 centimeters |
| TKA Patients | Skin to Adductor Canal Distance Disparity | Neutral vs straight leg raise distance (cm) | 0.43 centimeters |
| TKA Patients | Skin to Adductor Canal Distance Disparity | Neutral vs leg flexion distance (cm) | 0.63 centimeters |