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Introduction : The purpose of this study was to determine whether dysphasia after anterior cervical fusion can be influenced by the thickness of the plate.Methods : The study subjects were 145 consecutive patients of cervical spondylotic ,84 males and 61 females with mean age 51 years (range ,26 to 74), who.underwent one-level anterior cervical discectomy and fusion with plate.They were divided into two groups by the thickness of plate: Group Ⅰ >2 mm (CSLP-VA, Atlantis, Slimlock) of 88 cases, Group Ⅱ <2 mm (Zephir and Reflex-hybrid) of 57 cases.World Health Organization Dysphagia Grade was used to compare the incidence of postoperative dysphagia among the two different groups.Dyspagia evaluations were performed at 1 week, 3 months and 1 year following the operation.Results : There was no difference between two groups in rate of dysphagia at 1 week ,3 months and 1 year postoperatively (43% vs.40%, 15% vs.11%, 5% vs.4%, respectively P>0.05).Among all the patients there were 23 cases at C3-4 , 25 cases at C4-5, 82 cases at C5-6, 15 cases at C6-7.There were no difference between different level in rate of dysphagia at 1 week and 1 year postoperatively.But after 3 months of the operation, the incidence of dysphagia at C3-4 level was higher than others (30%, 17%, 9%, 14%, respectively, P<0.05).At C3-4 level, Six of 16(38%) group Ⅰ patients and one of 7(14%) group Ⅱ had dysphagia after 3 months of the operation.Plate at C3-4 can cause more dysphagia after 3 month of the procedure especially in group Ⅰ.Conclusions : Dysphagia after anterior cervical discectomy and fusion was very common, especially at the early time post the operation.After 3 months of the operation, the incidence of dysphagia is higher at C3-4 level than the other levels, and the use of thin plate can reduce the rate of dysphagia at this level.