Henderson underwent a cleanup procedure on his right shoulder Tuesday and is expected to need four months to recover. Details are starting to emerge regarding Henderson's surgery and the news is generally positive. The right-hander underwent an arthroscopic procedure to clean up the labrum and rotator cuff in his shoulder, but the four-month recovery window should put him on track to be ready for spring training. Henderson was limited to just 14 appearances this season as a result of the shoulder issues.