Hi Anne. I think the physio is a good idea while his doctors are trying to rule out neuromuscular disorders and the like. The therapists can work on stretching and strengthening as well as balancing his muscle groups (i.e flexors and extensors) and provide gait training to keep him safe from falls. I would suggest you ask your doctor to order nerve conduction tests (i.e. NCV/EMG) of the lower extremities. This will tell you if he has any nerve damage in the legs and, if so, where it is likely coming from and how long it has been present.