Cloth femoral-popliteal bypass grafts were inserted in 29 diabetic patients, in 28 of whom the saphenous vein was unavailable. Fourteen of 29 grafts were open longer than one year, and only two of the 14 subsequently closed. Four grafts were open more than four years. However, seven patients had spontaneous graft closure during the first year. The accumulated five-year patency rate was 59%. A walking foot was preserved for a significant period for 19 of the patients. All but one of the nine patients whose graft closed required a major amputation, while one of the sixteen patients with open grafts came to a major amputation. The relationship of the popliteal anastomosis to the knee joint did not affect late closure rate.