In the presented paper the authors evaluate the results of treatment in patients following revision knee joint alloplasties due to aseptic loosening of the tibia element in the endoprosthesis. The clinical material from the years 2000-2003 consists of 12 patients aged from 68 to 73; namely, 10 women (83.5%) and 2 men (16.5%). The longest time between the original implantation of endoprosthesis into the knee joint and the diagnosis of the aseptic loosening of its tibia element was 6 years and the shortest 2 years. The longest time of follow-up in patients who had had the revision operation was 2 years and the shortest was 6 months. The authors evaluated achieved results in the period between 20th and 24th month since the revision operation in 10 patients on the basis of the time criteria referring to the time of healing the-bone implants and on the basis of the HSS knee rating scale in their own modification. We achieved 9 very well and 1 sufficient results based on time criteria and 5 very well, 1 well, 3 sufficient, 1 insufficient results based on HSS knee rating scale criteria.