The rolling pack is illegal in designated wilderness areas, which may or may not be a problem for you.

While, as mentioned, I don't have your problem, I've had problems with lower back muscle spasms (which come back every time I neglect the exercises) and a knee that had to have nearly all the tendons reconstructed after a skiing injury (ditto), so being faithful to the exercises I was given for physical therapy and, especially, keeping my pack really light have been the key.