1. An attempt has been made to rationalise the selection of the site of amputation for gangrene in primary peripheral vascular disease.

2. There is a good chance of the survival of a below-knee stump if the circulation in the skin of the proposed flaps appears adequate clinically, and if the blood supply to the muscles is obviously good at amputation.

3. If the popliteal pulse is present before operation, below-knee amputation should succeed. The absence of a popliteal pulse, however, does not exclude below-knee amputation.

4. Below-knee stumps should be about four inches long in amputations for peripheral vascular disease.

5. Tests for determining the state of the circulation are also necessary before choosing the level for above-knee amputations.