Table 1.

Risk factors for venous ulceration

Direct risk factors

• Varicose veins

• Deep vein thrombosis

• Chronic venous insufficiency

• Poor calf muscle function

• Arterio-venous fistulae

• Obesity

• History of leg fracture

Indirect risk factors

• All risk factors leading to deep vein thrombosis including protein-C, protein-S, and anti-thrombin III deficiency

• Family history of varicose veins

• A history of minor trauma prior to the development of ulceration may also be identified