My thoughts are that MBD usually presents with swollen forearms if you are going to see front leg swelling (radial area) and mostly bilateral. Could it be an earlier injury such as a broken bone or an abscess?

It's hard to say over the Internet, but I would treat it with corrective measures such as a proper calcium rich diet, a good quality UV, and exposure to natural sunlight if at all possible.

If you are still concerned and the issue does not seem to resolve itself, a vet check would be a good idea. Of course, a vet check always beats internet advice.