眼眶爆裂性骨折伴眼球内陷的眼眶容积测量

目的　测量眼眶爆裂性骨折伴眼球内陷患者眼眶容积的改变量 ,探讨眼眶容积改变量和眼球内陷度数之间的关系。方法　应用CT影像和计算机图像处理技术 ,以及眼眶三维测量方法 ,测量 1 6例单侧眼眶爆裂性骨折伴眼球内陷患者外伤眼及对侧正常眼的眼眶容积 ,并采用Pearson方法进行统计学分析。结果　眼眶爆裂性骨折的眼眶容积增加量和眼球内陷度数呈高度正相关性(r=0 95 ,P <0 0 0 1 ) ,眼眶容积增加 1 0cm3,眼球将内陷约 0 9mm。结论　对眼眶容积进行测量 ,可预测眼眶外伤晚期发生眼球内陷的可能性和程度 ,为确定治疗方案及手术中植入眼眶内填充物的数量及体积提供客观依据。

Orbital volume measurement of enophthalmos of orbital blowout fractures

Objective To measure the volumetric changes of enophthalmos of orbital blowout fractures, and to study the relation between the change of the orbital volume and the degree of enophthalmos. Methods In 16 patients with enophthalmos of orbital blowout fractures, the measurement of orbital volume was carried out during 3 months to 2 years after injury by using the computed tomography (CT), computer image processing and computer orbital three dimensional measuring method. The relation between the orbital volume discrepancy and enophthalmos was assessed by using Pearson correlation coefficients. Results There were significant linear correlation between the increment of the orbital volume and the degree of enophthalmos ( r =0 95, P <0 001), with each 1 0 cm 3 increment in bony volume causing approximately 0 9 mm of enophthalmos. Conclusions Orbital blowout fractures can expand the orbital volume. The measurement of orbital volume may predict the risk and the final degree of the enophthalmos at the late stage, thus it may provide useful information in surgical intervention to estimate the size and volume of the orbital implant for an individual case.