8:40pm: Henderson will undergo an MRI, sources tell Chris Haynes of TNT and Bleacher Report (Twitter link). Haynes hears there’s optimism the shoulder isn’t dislocated.
Henderson had a great start, accumulating 13 points in the first quarter against Houston. He finished with 15 points, six assists, five rebounds and a steal in 21 minutes of action, shooting 5-of-13 from the floor (1-of-3 from three, 4-of-4 from the line).
It’s unclear at this time how severe the injury is. It’s not unusual for top prospects to be limited to a game or two during Summer League action, so the Trail Blazers might just be exercising caution. Still, it’s obviously unfortunate that the 19-year-old was injured in his debut with Portland, and hopefully it’s nothing serious.