Abstract: Objective Application system evaluation method to analyse foramen magnum decompression(FMD) and foramen magnum decompression combined with Syringo-subarachnoid Shunting(FMD+SSS) treatment of Arnold-Chiari malformation type1merger syringomyelia differences in therapeutic effect.
Methods We searched the documents about the foramen magnum decompression associated with foramen magnum decompression combined with Syringo-subarachnoid Shunting Arnold-Chiari malformation type1combined treatment of syringomyelia randomized,non-randomized controlled trial,strict quality assessment at the same time,the use of EndNoteX5,RevMan5.1,SPSS16.0 software for Meta-analysis included in the results of the study.
Results The results were incorporated into eight study accord with a standard(six in English and two in Chinese),a total of 441 were included in the analysis,Meta-analysis showed:the foramen magnum decompression comparative with foramen magnum decompression combined with syringo-subarachnoid shunting incidence of postoperative complications,surgical success rate,postoperative recurrence,postoperative pain symptoms improve the situation,improve postoperative movement,nerve nutritional disorders,and postoperative MRI observation hole there was no significant difference were syrinx in the reduced degree(P>0.05).Improve postoperative sensory disorder of simple decompression group is better than that of decompression + shunt group[ORmerge=8.24,95%CI:1.88～36.06,Z=2.80(P=0.005)],using the Bonferroni method to carry on the multiple hypothesis testing calibration results α＇=0.017,comparison between 0.017>0.005 had significant statistical significance.
Conclusion FMD and FMD+SSS treatment of Arnold-Chiari malformation type1 can achieve satisfactory therapeutic effect,but in comparison,simple foramen magnum 〖LM〗decompression improved postoperative sensory disorder has more advantages.

Key words: Chiari malformation, foramen magnum decompression, syringo-subarachnoid shunting, Meta-analysis, systematic review, non-randomized controlled trial