Originally Posted by
LawrenceMD 
so the RGIII ACL reconstruct was done using a patellar tendon harvested from his healthy knee.
using a patellar tendon has some differences/advantages compared to a hamstrings tendon graft.
- the patellar tendon graft will have bone on each end which will naturally fuse with the drilled anchor points.
- the patellar grafts bone to bone connection usually means faster fusing/healing time inside the knee.
- sometimes you are already out and doing heavy workouts/rehabs within 4months.
disadvantages:
- its an open surgery. (using hamstrings graft for ACL reconstruct can be done totally athroscopically).
- so there can be issues with infection especially at the incision points (this is what happened with tom brady). locker rooms, gyms, rehab centers are higher risk for resistant skin infections.
- also there can be constriction issues after suturing which can be tough to deal with during rehab during mobility and range of motion exercises.
- higher risk for debilitating arthritis (which is a risk for any professional athlete anyway).
if he was balling at an olympic speed level with his previous ACL reconstruct (which was a little iffy even after it looks like) then he should be ok and at an elite level next season as well. plus he's already gone through all the experience and mental issues of rehab and trusting a surgically repaired knee so he should be fine. there's a semi-misnomer about these type of knee surgeries being a "two year recovery". anatomically-physiologically wise its actually fine within the first year - its the mental aspect that can prolong it.
if adrian peterson can do it then RGIII should be in an even better situation (since he isn't a running back).