Flattening of the orbital lower eyelid fat as a long-term outcome after surgical treatment of orbital floor fractures.

Our aim was to report the incidence of asymmetry of the lower eyelid (that manifests itself as flattening of the eyelid fat) as a long-term complication of the surgical approach of unilateral fractures of the orbital floor. We retrospectively reviewed the aesthetic appearance of the lower eyelid in 43 patients after repair of such fractures. Long-term asymmetry seen as asymmetrical flattening of the eyelid fat was evaluated and graded qualitatively as mild, moderate, and severe. We studied its relations to the surgical approach, patient's age and sex, and postoperative time; 20 of the 43 had flattening of the lower eyelid fat. There were significantly more patients with flattening of the fat after a transconjunctival approach than after transcutaneous ones (p=0.03). We found a statistical likelihood of the development of flattening of the fat when patients were between 40 and 60 years old at the time of operation (p=0.006). Increasing age at the time of the study was related to increased severity (p=0.0019), with the greatest significance over 55 years old (p=0.006). We found no relation to patients' sex, or duration of operation. To our knowledge this is the first time that flattening of the eyelid fat has been described as a long-term complication after a particular approach to orbital floor fractures. The transconjunctival incision was more likely to be associated with this long-term outcome. Patients over 40 years old are also at risk of developing flattening, and this is more severe when the patient is over 55. A short follow-up period is not sufficient for the evaluation of the aesthetic outcome of traditional approaches to fractures of the orbital floor in the lower eyelid.