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Aim. To define relations between serum concentrations of sRANKL and BMP-2, IL-1β, TNFα, IL-4 as well as their role in endoprosthesis instability pathogenesis in patients following primary knee arthroplasties. Materials and Methods . 80 patients were retrospectively divided into 2 groups: there were 40 patients with osteolysis and aseptic instabilities of knee endoprosthesises that had developed before 12 months after the surgery in the 1 st group; the 2 nd group was made up of 40 patients with implantat-associated inflammations that had developed in 4 weeks to 12 months after primary knee arthroplasties. 20 volunteer donors made up the control group. The enzyme-linked assay was used to define serum content of sRANKL (pg/ml, Biomedica, Austria), BMP-2 (pg/ml, Ray Bio, USA), cytokines TNFα (pg/ml), IL-1β (pg/ml) and IL-4 (pg/ml) (Vector-Best, CJSC, Novosibirsk, Russian Federation). The comparative analysis of statistically significant indicants was performed defining Spearman rank correlation coefficient . Results . Positive statistically valid relations of average force between concentrations of sRANKL and BMP-2, TNFα, IL-4 were found in patients of the first group in 1 month after surgeries. In 12 months positive relations of the parameters under study subsisted although the relation with IL-4 absented. The emerging of moderate negative statistically significant relations of sRANKL with BMP-2 and TNFα was observed in patients of the 2 nd group in 1 month after surgeries. In 12 months negative relations of average force between sRANKL and BMP-2 subsisted, also new moderate relations emerged: negative relation of BMP-2 with IL-1β as well as positive of sRANKL with IL-1β and TNFα, IL-1β with IL-4. Conclusion . We found that the disorder of metabolic processes in bone tissue surrounding the implantat with the predominance of osteoclastogenesis activating pro-inflammatory cytokines might be the pathogenic factors of endoprosthesis instability development in patients following primary knee arthroplasty.

rossijskij mediko-biologičeskij vestnik imeni akademika i. p. pavlova/rossijskij mediko-biologičeskij vestnik imeni akademika i.p. pavlova

Comparative analysis of the change of bone tissue metabolism condition and cytokine profiles in patients with endoprosthesis instability after primary knee arthroplasty