Results All of the twelve patients had been followed up and the average period was 5.5 months.By JOA grade system, the mean scores were 13.5 preoperatively and 15.6 postoperatively.是什么意思_Results All of the twelve patients had been followed up and the average period was 5.5 months.By JOA grade system, the mean scores were 13.5 preoperatively and 15.6 postoperatively.在线翻译_英语_读音_用法_例句