Culkin tore a tendon, possibly multiple tendons in his left wrist. He could see them engaging as he moved his hand.
Everytime I read that, I picture the scene from the end of Empire Strikes Back where the mech droid is testing Luke's artificial hand and you can see the wires moving inside his wrist.
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Wes Gilbertson @SUNGilbertson
#Flames prospect Ryan Culkin, 21, was slated for surgery today after cutting tendon in left wrist. Expected recovery time is 8-10 weeks.