hi, thanks for the brief history and the opinion of the surgeon. as you mentioned you get pain by standing for long or walking long that means something is wrong in the upper part of the body not to hold up the additional pressure onto the navicular bone. Why don t you try doing physical therapy for some days and see how it helps with exercise. Looking forward by taking faradic stimulation under water is an optional way of activating the muscle of the feel and even provide a little of strength. post that try to discuss with your physical therapist as how about strenthing the core muscles along with hip and knee muscles. all doing it in non weight bearing and free exercises. like open kinematic exercises . I think that this might help to an extent for reducing the pressure onto the navicular bone. and ofcourse the Use of faradism under water will also add on some help. I had a similar patient in the past and he got helped to 100% and today he can walk, run, climb stairs and everything and no signs of pain and aches. body is a unit. and if the whole unit is made stronger at one go then the aches and pains will surely come down. I wish you a speedy recovery with the grace of god