Risky Rows

The upright row is a weight training exercise designed to work the upper back and shoulders.  It is considered a high-risk exercise because the movement causes internal rotation of the humerus (long bone of the upper arm), which can cause or aggravate shoulder impingement. 

While it is still a popular exercise, most people (especially those with shoulder problems) should avoid it.  If you must do it (and it is amazing how many people do not want to give up a favorite exercise),  you can make it a bit safer by using lighter weights, a wider grip, and making sure not to lift the weight above chest level.
Alternative exercises to work this area include shoulder shrugs, bent over rows and lateral raises.