Using the Seldinger technique, a total of 5306 percutaneous femoral vein catheterisations were performed in the course of ten years. Two-catheter venovenous dialysis was performed 2357 times and single-needle technique 592 times. There were five important complications: severe retroperitoneal bleeding after perforation of the external iliac vein three times, fatal bleeding from the femoral artery once, and reversible damage to the femoral nerve once. The results indicate that for every 1000 percutaneous femoral-vein catheterisations one must expect one severe complication. However, by using the correct catheter technique, especially careful manipulation of the wire, complications can be largely avoided.