Due to severe infection, the doctor had to perform amputations on his leg.

amputations 是名词 amputation 的复数形式。amputation 来自动词 amputate（截肢），由前缀 am-（表示"去除"）和拉丁词根 putare（意为"修剪、清除"）组成，字面意思是"切除肢体"。在医学上指"截肢手术"。