"Dr. Yocum was very pleased with it," said team spokesman Mike Swanson.
Swanson said that Duffy was already getting antsy and was filling his time by Tweeting and texting teammates -- with his right hand, of course.
His surgery was delayed by strep throat. Duffy has been out since May 14, finishing his season with a 2-2 record and 3.90 ERA in six starts. Normal recovery time for the elbow reconstruction procedure is 10 to 14 months.