Vascular stent prosthesis is a specially designed metal coil or mesh which supports the inner vascular wall, thus providing normal blood flow. The objective of the study was three-fold: to evaluate clinical results of intravascular implantation, to establish the frequency of early and late complications, and to determine the measures which should be taken to prevent those complications, and to determine the measures which should be taken to prevent those complications. We studied a group of 20 patients undergoing stent implantation. The average follow-up period was 23,9 months. We assessed their clinical condition before and after the implantation, and at the time of the study. Our results and the findings reported by other authors indicated that placing a stent in a large vessel offers a permanent solution to some vascular diseases. In smaller vessels (e.g. femoropopliteal arteria), however, the operation is associated with a higher rate of early and late postoperative complications, limiting its clinical use. Early thrombosis can not be completely prevented, not even by anticoagulation therapy. The problem remains of intimal hyperplasia still remains to be solved. Further search will be needed to find ways to prevent complications and thereby extend the clinical use of vascular endoprosthesis.