Abstract
Aim. To assess the separate indices of blood serum bone tissue metabolism content in patients with instability of prostheses after the primary knee joint arthroplasty.
 Materials and methods. The main group joined 40 patients with implant-associated inflammation, the comparison group – 40 patients with primary aseptic instability of prostheses, the control – 20 conditionally healthy donors. The blood serum hPTH and 25-OH Vitamin D content was determined using solid-phase immune-enzyme assay.
 Results. Among the patients of the main group, blood serum hPTH concentration increased as compared with the control after1 and 12 months following the surgery and compared with each previous observation period; 25-OH Vitamin D level decreased compared with the control before the surgery, after1 and 12 months following the surgical intervention and compared with each previous period of observation. In the patients of the comparison group versus the control values, blood serum hPTH concentration elevated and 25-OH Vitamin D level declined after 1 and 12 months following the surgery and compared with the previous observation period 1 month later.
 Conclusions. When estimating the blood serum hPTH and 25-OH Vitamin D content in patients with instability of prostheses after the primary knee joint arthroplasty, there were revealed multidirectional changes in their levels, showing bone tissue metabolic disorders.
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