Adductor Canal Block Versus Femoral Block on Pain and Quadriceps Strength

Study Results

Results available

Outcome measurements, participant flow, baseline characteristics, and adverse events have been published for this study.

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Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

PHASE4

Total Enrollment

132 participants

Study Classification

INTERVENTIONAL

Study Start Date

2016-01-31

Study Completion Date

2022-03-20

Brief Summary

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The purpose of this study is to compare the effects of a femoral nerve block vs. an adductor canal block on pain and quadriceps muscle strength for knee arthroscopy surgery.

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Detailed Description

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Patients undergoing arthroscopic knee surgery (ACL and non-ACL surgery) typically receive an ultrasound-guided femoral nerve block or an adductor canal block in the pre-operative phase for post-operative pain control. While an effective method for post-operative analgesia, the femoral nerve block is associated with profound quadriceps weakness for the duration of the nerve block, which can impair ambulation, rehabilitation, and increase the risk of falls. The more distal adductor canal block, however, contains primarily sensory branches of the femoral nerve and has been been purported by small volunteer studies to provide equally effective analgesia with minimal motor block and quadriceps weakness (as compared to femoral nerve block).

The investigators will prospectively randomize patients undergoing knee arthroscopy at the UCSF Orthopaedic Institute to receive either a single-shot femoral nerve or adductor canal block pre-operatively after taking baseline measurements of quadriceps strength (quantified by maximum voluntary isometric contraction). The quadriceps muscle strength will be checked 20 minutes after the nerve block to assess strength. All patients will subsequently undergo a general anesthetic. The primary outcome variable will be post-block quadriceps strength as a percentage of baseline from pre-block values. Secondary outcome variables that will also investigated include: VAS pain score in the post anesthesia recovery unit and post-operative day 1, duration of nerve blockade, and perioperative opioid consumption.

Conditions

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Anterior Cruciate Ligament Tear Knee Meniscus Tear

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

DOUBLE

Participants Outcome Assessors

Study Groups

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Femoral Block

Patients scheduled for knee arthroscopy will have a femoral nerve block done using 0.5% ropivacaine 20ml before surgery.

Group Type ACTIVE_COMPARATOR

Femoral Nerve Block

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Inclusion Criteria

* American Society of Anesthesia I-III classification,
* Scheduled for arthroscopic knee surgery (meniscal debridement/repair, ACL reconstruction)

Exclusion Criteria

* Age younger than 18 years
* Non-English speaking
* Any contraindication for regional anesthesia, such as allergy to local anesthetics or opioids, -Coagulopaty or severe thrombocytopenia
* Infection at puncture sites
* Pre-existing neuropathy in operative limb
* Need for post-operative nerve function monitoring
* Dementia
* Patient refusal
* High pre-operative opioid requirements

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No