爆裂性骨折所致眼球内陷的CT研究

目的:研究眼眶爆裂性骨折后,眼球内陷与眼眶容积扩大的关系并对眼球内陷进行早期预报。方法:28例单侧眼眶爆裂性骨折后1～350 d患者,分别测量双侧眼球位置和骨性眼眶容积值,计算患侧眼球内陷值(E)和骨性眼眶容积扩大值(V),应用pearson积矩法研究E、V相关性并建立直线回归方程。结果:28例患侧E、V呈正相关(r=0.88,P<0.001);15例≤24 d的患者直线回归方程为E=0.85 V-1.74(r=0.86,P<0.001),13例>24 d的患者直线回归方程为E=0.86 V-0.60(r=0.9,P<0.001)。结论:眼球内陷值与眼眶容积扩大值高度相关;1 mL眼眶容积的扩大,可引起大约0.9mm(0.85～0.86 mm)的眼球内陷。与伤后>24 d的相比,≤24 d的眼球有明显的抗拒内陷的趋势,>24 d之后,这种趋势逐渐消失,随之发生眼球内陷。

CT Study on Enophthalmos Resulted from Blow Out Fracture

Objective: To study the enophthalmos resulted from blow out fracture with CT. Methods: Using pearson correlation coefficients, the correlation between measurement of orbital volume and enophthalmos in 28 patiens with blow out fracture of unilateral orbit was reasearched so as to obtain a linear regression formula. Results: In 15 patients within 24 days after injury, the correlative factor was r = 0.88, P<0.001 and the regression formula was E = 0. 85V-1. 74. In 13 patients more than 24 days after injury, the correlative factor was r = 0.90, P<0.001 and the regression formula was E = 0.86 V-0. 60. Conclusion: The increase of orbital volume correlated well with the enophthalmos(r = 0.88, P<0.001) .A 1 mL of increase of orbital volume may cause 0. 85 - 0.86 mm of enophthalmos. Within 24 days after injury, eyeball has a significant tendency of enophthalmos.