Objectives:Increased parathyroid hormone (PTH) ,roductionand related defects of calcium-phosphorusmetabolismcould persist even after successful kidney transplantation. Much more s rious long term consequences after the transplantation are bone defects caused by immunosuppressive drugs. Many authors consider ~ eroid therapy as one of the factors that maintain this process. Our study aimed to investigate calcium-phosphorus and bone pathological feature: during the various post transplantation periods. using non-invasive bone research methods (bone ultrasound structurally-densitornetricanalysi: I.and also to analyse the risk of hyperparathyroidism and steroid therapy in the development of post transplantation osteopathy. Methods: 52 patients after successful kidney transl antation were investigated. All patients were divided in three groups according to the time after transplantation. Ist group-patients in the earli ir post transplantation period. up to I year (n= 12); 2ndgroup-patients in the period from I to 5 years after transplantation (n=25); 3rdgroul -patients in later post transplantation period (more than 5 years after the transplantation, n=15). Results: 8 patients from the 1stgroup (66,7%), I I patients from the 2nd group (72%) and 8 patients from the 3rd group (53,3%) had an increased level of serum creatinine. The level of :orrected serum Ca was increased (p

Keywords: renal transplantation, osteopenia, secondary hyperparathyroidism, steroid therapy