I have a stress fracture on a lumbar disc, no advice was given to me. Thanks for posting, this is helpful. All the best to your husband.
He should be trying to rest this fracture as much as possible. He can put weight on it, but it shouldnt be very much and not for long periods of time. The best thing to do is rest it, elevate it and try to stay out of pain. The stress fractures occur when so much stress is put on the muscles and they can no longer handle it so it ends up fracturing the bone. He needs to give those muscles time to heal as well. If he has a desk job and his company is accomodating, maybe he can go back to work with minimal walking and keeping his foot elevated when he is at his desk.