Finger sprains are the most common injuries in sports activities involving the hand. They have many mechanisms of injury but the most common for pitchers is the FOOSH (Fall On Out Stretched Hand) mechanism. Instead of falling on the out stretched hand, pitchers will sprain the finger when the breaking ball is released on the middle finger of the throwing hand. Since the middle finger is the last to touch the ball, sometimes it can be outstretched if the pitchers release point is slightly off.
Kluber's sprain will need to be splinted with a rigid splint for three weeks and then a removable, flexible splint for another three to four weeks. Once cleared by the medical staff, Kluber can begin to lightly throw and then be reassessed. At that point, either more rest or a rehab assignment would be recommended.