Ultrasound Guided Adductor Canal Block Versus Femoral Nerve Block for Quadriceps Strength and Fall-risk

Study Overview
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Brief Summary
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Our objective was to determine if an ultrasound guided ACB can preserve quadriceps strength, thus minimizing weakness of knee extension compared with ultrasound guided femoral nerve block. Our primary outcome was the percent of maximum voluntary isometric contraction (MVIC) of knee extension preserved at 30 mins after either an ACB or FNB. Secondary outcomes included MVIC of knee extension at 60 min, hip adduction at 30 and 60 mins, and assessment of fall risk with the Berg Balance Scale (BBS) at 30 minutes.

Official Title
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The Effects of Ultrasound Guided Adductor Canal Block Versus Femoral Nerve Block on Quadriceps Strength and Fall-risk: a Blinded Randomized Trial of Volunteers

Conditions
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Quadriceps Muscle Weakness, Adductor Muscle Weakness, Fall Risk

Intervention / Treatment
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* Procedure: Ultrasound Guided Adductor Canal Block
* Procedure: Ultrasound Guided Femoral Nerve Block


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adults (>18yrs) ASA 1-2 Exclusion Criteria: BMI >30 Allergy to local anesthetics Pre-existing gait disturbance Pre-existing neuropathy

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Adductor Canal block first<br>This arm received an ultrasound guided adductor canal block with 15mL of chloroprocaine 3% followed by motor, sensory and balance assessments. Then the patients received an ultrasound guided femoral nerve block with 15mL of chloroprocaine 3% followed by sensory and motor assessments. | Procedure: Ultrasound Guided Adductor Canal Block<br> <br> Procedure: Ultrasound Guided Femoral Nerve Block<br> <br> |
| Experimental: Femoral nerve block first<br>This arm received an ultrasound guided femoral nerve block with 15mL of chloroprocaine 3% followed by motor, sensory and balance assessments. Then the patients received an ultrasound guided adductor canal block with 15mL of chloroprocaine 3% followed by sensory and motor assessments. | Procedure: Ultrasound Guided Adductor Canal Block<br> <br> Procedure: Ultrasound Guided Femoral Nerve Block<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percent of maximum voluntary isometric contraction (MVIC) of knee extension preserved at 30 mins after either an ACB or FNB |  | At 30 minutes | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percent of maximum voluntary isometric contraction (MVIC) of knee extension preserved at 60 mins after either an ACB or FNB |  | At 60 minutes | 
| Percent of maximum voluntary isometric contraction (MVIC) of hip adduction preserved at 30 mins after either an ACB or FNB |  | At 30 minutes | 
| Percent of maximum voluntary isometric contraction (MVIC) of hip adduction preserved at 60 mins after either an ACB or FNB |  | At 60 minutes | 
| Assessment of fall risk with the Berg Balance Scale (BBS) at 30 minutes after the first nerve block. |  | At 30 minutes |