How do I know if surgery is needed for navicular fracture. Non displaced with edema?

Navicular fracture. If this was a stress fracture or secondary to trauma, the biggest question is what was the eliciting event. You should allow for an adequate time for the bone to completely heal. If you continue to have edema/swelling a trial of topical anti-inflammatory cream containing diclofenac may be helpful. I would recommend close follow-up with a sports medicine orthopedic specialist.