Well Stoll had surgery the week after NCAAs. He tweeted on March 26th.. "Day 1 into a long road to recovery. Thankful for the support of fans, friends and family. Can't wait to get back to full form.
#GOHAWKS!".
So i'm assuming it was an ACL tear or some other big tear in the knee. Hopefully he has a smooth road to recovery.
On another note, I'm sure CHA will erupt when the sound of the Imperial March goes off over the loudspeakers and Stoll walks out for his first match next year, whether its in Nov, Dec, or Jan.