Continuous Interscalene Block for Same Day Discharge Following Total Shoulder Arthroplasty

Interscalene catheters will be placed under aseptic precautions in each patient by one of the investigators using combined peripheral nerve stimulation and ultrasound guidance to get twitch in the C5-C6 dermatomes and documented spread of injectate near C5-6 nerve roots. Twenty mL of 0.2% ropivacaine will be injected while documenting adequate drug spread under ultrasound. After 20 min of injection, the interscalene nerve block will be evaluated and considered successful with inability to abduct the shoulder and a decrease in perceived sensation to cold of the skin over the deltoid muscle.