Meanings of gangrenous leg in English

I speak to Carre in veiled words of the troublesome, gangrenous leg.

For they had saved a gangrenous leg for him when all hope seemed ended.

We had another twenty-five come in today, and one of them had a gangrenous leg.

Mr Temaru says Mr Urvoas's current work on the statute is nothing but cosmetics on a gangrenous leg.

He was sick with a gangrenous leg, but he had five thousand men with him and could call on as many again.

In the final scene, Denny suffers from an opiate haze and a gangrenous leg, alternately threatening murder and suicide, smiling and snarling at once.