Shoulder Arthroscopy | Optimal Location of Local Anesthetic Injection for Ultrasound Guided Interscalene Block

Shoulder Arthroscopy research study

What is the primary objective of this study?

This is a prospective randomized clinical trial to determine where is the optimal location for local anesthetic injection for ultrasound guided interscalene nerve blocks. The investigators are investigating if local anesthetic deposited between the nerve roots is more effective than local anesthetic deposited in the interscalene groove.

Who is eligible to participate?

Inclusion Criteria: ASA I-II patients who are 18 years and older and who are scheduled for shoulder arthroscopy are eligible for enrollment provided they do not have any of the following exclusion criteria. Exclusion Criteria: - chronic pain - high preoperative opioid requirement - age < 18 years old - non-English speaking - contraindication to regional anesthesia (allergy to local anesthetics, coagulopathy, severe thrombocytopenia, pre-existing neuropathy in operative limb, infection at puncture site) - need for postoperative nerve function monitoring - patient refusal - dementia - pulmonary disease or low baseline oxygen saturation

Which medical condition, disease, disorder, syndrome, illness, or injury is researched?

Shoulder Arthroscopy

Ultrasound-guided Interscalene Nerve Block

Study Interventions

Interventions can include giving participants drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available or noninvasive approaches such as surveys, education, and interviews.

Procedure:Interscalene block for shoulder arthroscopy

Study Arms

Research studies and clinical trials typically have two or more research arms. An arm is a group of people who receive the same treatment in the study.

Injection in interscalene groovePatients undergoing shoulder arthroscopy will have an interscalene nerve block by injection of ropivacaine in the interscalene groove anterior and posterior to the brachial plexus nerves.

Injection between nerve rootsPatients undergoing shoulder arthroscopy will have an interscalene nerve block by injection of ropivacaine in the interscalene groove inbetween the C5 and C6 nerve roots.

Study Status


Start Date: January 2013

Completed Date: April 2016

Phase: N/A

Type: Interventional


Primary Outcome: Onset of motor blockade

Secondary Outcome: Patient Satisfaction Score

Study sponsors, principal investigator, and references

Principal Investigator: Pedram Aleshi, MD

Lead Sponsor: University of California, San Francisco


More information:

Discuss Paraesthesia