＜正＞Objective:To detect the influencing factors for posttraumatic hydrocephalus in patients with severe traumatic brain injuries and provide theoretical reference for clinical treatment. Methods:Retrospective study was made on 139 patients with severe traumatic brain injuries in our hospital.The patients were divided into two groups:hydrocephalus group and non-hydrocephalus group.Single factor analysis and multiple factor analysis were used to determine the related factors and hydrocephalus.Multiple factor analysis was conducted with logistic regression. Results:Posttraumatic hydrocephalus was found in 19.42% of patients.Age（OR=1.050,95% CI:1.012- 1.090）,decompressive craniectomy（OR=4.312,95 % CI: 1.127-16.503）,subarachnoid hemorrhage（OR=43.421, 95% CI:7.835-240.652）and continuous lumbar drainage of cerebrospinal fluid（OR=0.045,95 % CI:0.011-0.175） were screened out from nine factors as the influencing factors for posttraumatic hydrocephalus. Conclusions:Risk factors for PTH are as follows:age, decompressive craniectomy and subarachnoid hemorrhage （SAH）.Continuous lumbar drainage of cerebrospinal fluid can greatly reduce posttraumatic hydrocephalus.
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