Is it possible for a 26 year old to have an unfused apophysis? thats what my doctors are trying to diagnose, ive had lateral foot pain for 4months and an x-ray shows what looks like an avulsion fracture of the 5th metatarsal?

You could have which commonly misdiagnosed as a subluxation of the cuboid bone. There are a few people in the country that consider this to exist. Dr. Stanley Newall. A podiatrist in Seattle Washington Wrote a very good article on this very topic. I found that a limited range of motion in a clockwise and counterclockwise position is pathognomonic for subluxation of the cuboid