the fibula is not a weight bearing bone and is well-supported in most cases by the surrounding soft tissue/muscle. obviously i can't see your x-ray to offer you any patient-specific advice but the orthopedist should have the knowledge and skill to provide the proper management of this fracture. if you are not confident see a different orthopedist for a second opinion.
3 inch section of fibula broken and detatched completely. doctor says it doesn't need repaired. is this true?