He hurt his leg,now the doctors are on his leg【填什么单词?o开头】

operating
operate,“动手术”的意思 .When surgeons operate on a patient in a hospital,they cut open a patient's body in order to remove,replace,or repair a diseased or damaged part.
举例：
The surgeon who operated on the King released new details of his injuries...为国王动手术的外科医生通报了其伤势的最新详情.

operating

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为某人动手术operate on sb 前面是系动词，所以operate要变形为operating

operating , 给他的腿动手术