SAN FRANCISCO — Jake Cronenworth hasn’t slid headfirst in years, at least not intentionally. He last did so in 2013, when as a freshman infielder-pitcher at the University of Michigan he awoke one morning and could not lift his right arm above his head. He later learned that an accumulation of things had resulted in a torn labrum.
The shoulder is the most flexible joint in the human body, enabling a wide range of motion, such as the mighty swing that produced a 465-foot home run at Petco Park on Sunday.
Indications and Biomechanics of Anatomic and Reverse Shoulder Arthroplasty
Pain and tenderness at the top of the shoulder and difficulty reaching the arm across the body—to swing a golf club or put on a seat belt, for example—may be a sign of acromioclavicular arthritis.
The shoulder joint is a marvel of form and function—and a common cause of pain. The shoulder’s design allows it to rotate a full 360 degrees, but this wide range of mobility also can make it prone to problems.