A retrospective study of 112 consecutive patients with frontal sinus fractures who were available for follow-up is presented. Significant complications are possible, especially with fracture of the posterior sinus wall. When indicated, the sinus is reconstructed with wire using free denuded fragments if available. Severe complications in displaced posterior wall fractures were less common when treatment was by sinus obliteration than by cranialization. Computed tomography has improved the evaluation, especially when a posterior wall fracture is suspected.