There is no such thing as a medical redshirt, but rather it is referred to as a hardship,and must be approved by the NCAA as not to lose a year of eligibility.
The player should be entitled to any scholarship $$ and can rehab while finishing the school year.
If this is your son, you or his mom might want to step in to speak with compliance regarding transfering out vs staying, contact the NCAA or contact Rick as suggested above.
JMO