The Diagnostics of CT and Surgical Therapy for Orbital Blowout Fractures

Objective] To investigate the features of enophthalmos and deformities of orbital walls in patients with orbital blowout fractures and the methods of surgical therapy. The features of orbital deformities and the changes of orbital volume were analyzed and measured by means of three dimensional CT technique and 3 D diagnostic computer assisted system .The reconstructive operations were employed on these 11 cases with orbital blowout fractures to correct deformities and restore orbital volume by applying autogenous bone grafts or hydroxyapatite bone substitutes. The CT images showed that there were bone defects of medial and inferior orbital walls and enophthalmos in all cases. Close correlation between orbital volume and extent of enophthalmos was found(r= 0 911 3).Of these 11 cases,10 cases got satisfactory appearance of eyelids and orbit , of which the diplopia and enophthalmos were corrected . Only 1 case remained diplopia after surgical correction. [ Conclusion] The features and extents of orbital fractures can be diagnosed by CT imaging technique.The surgical therapy of correcting diplopia and enophthalmos includes releasing extraocular muscles , putting back entrapped orbital content , implanting autogenous grafts and hydroxyapatite substitutes to restore orbital volume.