Can't find anything on tarsal navicular subchondral fractures. are they that rare? are they serious? what are the options

If you are in pain : Or if the condition can potentially cause further issues it is serious. I answered in your first question a bone stimulator would be a good treatment. You would also obviously have the foot immobilized. I think you said you were in a walking boot. You may want. To consider crutches. If your a smoker you must stop, and have your vitamin d levels checked.