摘要
背景:关节置换已经成为治疗终末期关节炎的最有效措施。然而,无菌性假体松动是关节置换的主要长期并发症。如何减缓假体松动成为研究的热点。目的:研究在假体松动过程中,不同浓度钴铬颗粒刺激成骨细胞前体细胞的生物学反应。方法:(1)体外实验:成骨细胞前体细胞以成骨细胞诱导液培养后,用0.3或1.25 g/L的钴铬颗粒进行刺激;(2)体内实验:将钛钉置入严重联合免疫缺陷小鼠(n=18)胫骨近端模拟膝关节置换。术后1周,将经过钴铬颗粒刺激的5×10~5个成骨细胞前体细胞注射入膝关节腔内。稳定对照组(n=6):小鼠胫骨仅置入钛钉,无钴铬颗粒和细胞处理;松动对照组(n=6):小鼠置入钛钉前,向胫骨髓腔注入4×10~4个钴铬颗粒;钴铬颗粒处理组(n=6):小鼠置入钛钉前,向胫骨髓腔注入4×10~4个钴铬颗粒,关节腔内注射用钴铬合金颗粒刺激的成骨细胞前体细胞。结果与结论:(1)体外实验:随着钴铬颗粒浓度的增加,碱性磷酸酶和成骨基因表达呈下降趋势;(2)体内实验:与松动组相比,关节腔内注射经过钴铬颗粒刺激的成骨细胞前体细胞导致假体周围炎性假膜的增厚,骨与假体界面剪切力的减少,骨密度和骨体积的降低,抗酒石酸酸性磷酸酶阳性细胞数量的增加;(3)结果提示钴铬颗粒抑制成骨细胞前体细胞的生长、成熟以及功能的发挥。钴铬颗粒刺激的成骨细胞前体细胞可能加重假体周围的炎症反应,促进破骨细胞的分化。
BACKGROUND: Arthroplasty has been the most effective treatment for the end-stage osteoarthritis. However, aseptic loosening is the main long-term complication of arthroplasty. How to ameliorate aseptic loosening is an issue of concern. OBJECTIVE: To investigate the biological behavior of preosteoblasts induced with cobalt-chromium particles during aseptic loosening process. METHODS:(1) In vitro experiment: preosteoblasts were cultured in an osteoblast-induction medium and induced with different doses(0.3 or 1.25 g/L) of cobalt-chromium particles.(2) In vivo experiment: titanium screws were implanted to proximal tibia of server combined with immune-deficiency mice to simulate knee joint arthroplasty. Cobalt-chromium particles inducing MC3 T3-E1(5×10~5) were intra-articularly injected into the implanted knee at 1 week after surgery. Stable group(n=6): screw implanted mice without local particle insertion and cells transfusion; loosening group(n=6): mice were given an intra-articular injection of cobalt-chromium particles(4×10~4) before screw implantation; cobalt-chromium group: mice were given an intra-articular injection of preosteoblasts induced by cobalt-chromium particles and cobalt-chromium particles(4×10~4) before screw implantation. RESULTS AND CONCLUSION:(1) In vitro experiment: with the increasing of cobalt-chromium particles, alkaline phosphatase and osteogenic gene expression was decreasing.(2) In vivo experiment: intra-articular injection of cobalt-chromium particles inducing MC3 T3-E1 cells resulted in thicker peri-implant pseudomembrane, reduced the shear strength of bone-implant, decreased bone mineral density and bone volume, and increased the number of positive cells for tartrate-resistant acid phosphatase.(3) These results indicate that cobalt-chromium particles inhibit the growth, maturation and functions of preosteoblastic cells. Cobalt-chromium particles inducing preosteoblasts may aggravate periprosthetic inflammation and promote osteoclastogenesis.
引文
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