If he can walk he can drive, I hardly think driving would be anymore stress on his back than walking.
Do you actually drive yourself rob, because if you do you should be aware of the movement involved. Even just turning the wheel involves using back muscles, let alone having to twist it round in order to swerve to avoid hitting a pedestrian or a car driven by a careless driver or having to to an emergency stop for the same reason which would give it quite a jolt. Also have you ever wondered why many car drivers use back-rests?
Speculation has been in overdrive on MW! I was happy to go with the John Terry type recovery from back surgery unless we heard to the contrary, but others have been more pessimistic.http://www.physioroom.com/sports/injury_case_studies/herniated_disc_terry.php
I am aware though that Andy can't be substituted during a match if it gets too much, so he may have to be more careful about his return!
Having already read about Terry's case, I share the same optimism Elena, but still can't see him playing best of five matches at a tournament which is only a month away. Footie isn't as physical as tennis anyway, so even if Andy is super-fit and undoubtedly has excellent core strength already, which will certainly stand him in good stead, I'll be very surprised if he returns before the start of the next season, something I'm happy to accept. From what we've been hearing though it does seem that he has an excellent chance of going to Miami as usual for his winter training.
Also Terry may have been running round the pitch the day after his op, but I somehow don't think Andy was doing anything quite as energetic. Also it's just possible that Terry had the op done using a local anaesthetic, perhaps an epidural, whereas Andy had to get over the effects of a general one.