Had a ct scan on wrist showed no fracture. but could it miss a avalsion fracture. which is basically a chipped bone, what to do?

See hand specialist: Ct scan is very good at identifying certain fractures in the wrist, depending on how fine the cuts are. A small chipped bone is not of much concern unless it is associated with a ligament injury. A hand specialist is the best person to evaluate you for a ligament injury. Sometimes additional tests - MRI and/or arthrogram - are necessary, and some injuries benefit from early surgcial intervention.