What happens before and after a navicular bone surgery on my feet?

Healing: Fracture starts healing. Reduction & internal fixation brings the fragments together and it accelerates the healing in correct allignment.

Talk to your Surgeon: This can vary depending on the exact nature of the surgery - whether this a tendon advancement, removal of excess bone, fracture repair of fusion. Regardless, you should expect a period of several weeks of non-weightbearing. You should absolutely have a discussion with your surgeon preoperatively to ensure that all of your questions have been answered.

Navicular bone : This is difficult to answer without knowing what type of procedure being performed and for what pathology.