Post-Injury Effects of Pre-Injury Fitness

At least one study is showing how important an active lifestyle before injury is for recovery after injury.  I don't have any information about the medication rehabilitation mentioned at the end of the article, but the rest of the study certainly makes sense.  If you have more muscle memory before an injury, it seems to help with rebuilding or retracing neural pathways afterward.  It would be interesting to see more here on statistical differences for exercise types — i.e., when possible, actively or passively retraining post-injury with the kinds of exercises you used to do pre-injury.  At any rate, from what I have seen (and not just in my own case), active or assisted exercises are essential elements for muscle return.