Did your vet offer any other explanations?
Great you have done an xray, however your vet should have advised you of other possible reasons and the best way to treat him? If your vet didn't I wonder if you should ask for a copy of the xray and take along to another vet for a second opinion.
I have had dogs start limping, sometimes they just temporarily injury their limps when doing things like jumping and land the wrong way, or run at and along your fence line so that they stop suddenly all the time etc.
I would keep him still as possible, no exercise, make sure he has very soft bedding and add some warmth to the area. If you aren't going to get a second opinion soon, do the above and see how he goes in a couple of weeks.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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