operational failure meaning in English

操作故障
工作失效
运行失效
运转故障

Result the reasons of operational failure were found to be the use of unreasonable regimens and existance of drug resitant strains ; inappropriate operational indication , approach and treatment during operation ; lesions involving several vertebras , skipping destruction and complicating with other kinds of extrapulmonary tuberculosis
结果治疗失败的主要原因为：化疗不合理及耐药菌株的产生；手术时机、术式选择及术中处理不当；多椎体病变、跳跃型病变及合并其他肺外结核。