An Analysis of Orbital Reconstruction with Bioresorbable Plate Through Orbital Volume Assessment

Purpose To evaluate the early effect of orbital reconstruction with MacroPore® by assessment of orbital volume through orbital computed tomography (CT) in cases of orbital wall fracture Methods We performed orbital reconstruction with MacroPore® in patients with orbital wall fracture smaller than 3 cm×2 cm. Orbital CT was done preoperatively and 6 months postoperatively. We then evaluated the results by measuring the orbital volume through Rapidia 2.8 program. Results The study comprised 14 patients. The site of fracture was the medial wall in one patient, inferior in seven, and both medial and inferior in six patients. The site of insertion of MacroPore® was the medial wall in one patient, inferior in 12, and both medial and inferior walls in one. The mean volume of the affected orbit before operation was 20.23±2.78 cm3 that of the unaffected orbit was 18.27±2.24 cm3 (p- value=0.000), and the mean volume of the affected orbit after operation was 19.06±2.57 cm3 that of the unaffected orbit was 18.06±2.24 cm3 (p-value=0.000). The mean enophthalmos before operation was 1.00±0.62 mm, and after operation was 0.64±0.46 mm. The mean difference of orbital volume between the affected and the unaffected orbits before operation was 1.96±0.33 cm3 and 1.00±0.87 cm3 after operation (p-value=0.000). The mean volume of the affected orbit before operation was 20.23±2.77 cm3 and 19.06±2.57 cm3 after operation (p-value=0.000). Each cubic centimeter decrement in volume caused a 0.67±0.68 mm mean decrease of enophthalmos. Conclusions We concluded that MacroPore® was safe orbital implant and effective in decreasing the orbital volume at early orbital reconstruction in cases of orbital wall fracture smaller than 3 cm×2 cm through a comparison of orbital volume before and after operation.