From 1983 to 1987, 293 femoro-crural bypasses were performed in eight centers for vascular surgery in Denmark. The activity increased in the period from 15 to 135 bypasses per year. The increase took place particularly 1986, when the in situ saphenous vein bypass was introduced in Denmark. A total of 203 bypasses were performed at the University Hospital of Copenhagen, Rigshospitalet: 108 in situ bypasses, 51 bypasses with arterial protheses and 44 bypasses using reversed vein. The cumulated graft patency after one year was 76% for the in situ bypasses, 26% for the bypasses with arterial protheses and 32% for reversed vein. The cumulated limb survivals after one year were 90%, 66% and 63%, respectively.