Where are ulcers from peripheral arterial disease most likely to occur?

Ulcers resulting from peripheral arterial disease (PAD) typically occur in areas with the poorest blood supply, which are often found on the lower extremities. The lateral malleolus, located on the outside of the ankle, is a common site for these ulcers due to its anatomical position susceptible to pressure and the lack of sufficient blood flow in individuals suffering from PAD.

In contrast, other areas mentioned, such as the medial malleolus, footpad, and heel, are generally associated with venous ulcers or are not the primary sites of ulceration in PAD. The medial malleolus is more prone to venous ulcers due to venous insufficiency. The footpad may be less affected by PAD ulcers as it can have better blood supply due to its location under the foot. Similarly, the heel is not as characteristic for PAD-related ulcers, although it can develop pressure ulcers in immobile patients or those with diabetic neuropathy. Thus, the lateral malleolus stands out as the most likely location for ulcers related specifically to peripheral arterial disease.