Insulin-like growth factors I and II in the aseptic loosening of total hip implants.
SCANDINAVIAN JOURNAL OF RHEUMATOLOGY(2009)
Abstract
Periprosthetic interface tissue and pseudocapsule samples surrounding aseptically loosened hip implants and control knee synovium were studied by reverse transcriptase polymerase chain reaction (RT-PCR) and immunohistochemistry. Endothelial cells, fibroblasts, and monocyte/macrophages contained bone formation-enhancing insulin-like growth factors (IGFs). In interface tissue we found fewer IGF-I and IGF-II positive cells than in control tissue. In pseudocapsular tissue we found fewer IGF-I positive cells and an equal amount of IGF-II positive cells compared to control tissues. Decreased bone formation may contribute to net loss of bone around aseptically loosened hip implants.
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Key words
hip,growth factors,aseptic loosening,insulin-like
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