Ahmed A M, Raab S, Miller J E
J Orthop Res. 1984;2(2):105-18. doi: 10.1002/jor.1100020201.
To characterize the strength of the interface between stem-type metal implants and bone cements, a fracture mechanics parameter was used. This parameter, the critical strain energy release rate (Gc), was determined from "push-out" tests of cylindrical specimens. The specimens, formed using molds of bone, were maintained and tested at body temperature. The strength of interfaces formed with cancellous bone surrounding the cement mantle was significantly less than the strength of those formed in apposition to cortical bone. A marked degradation of strength was found with saline immersion for SS316LVM/cement interfaces formed with Zimmer regular, Simplex-P, and Zimmer LVC cements. After 60 days of immersion the interface Gc was only 10-20% of the value for bulk cement. Interfaces formed with thin-film polymethylmethacrylate-precoated metals (SS316LVM, Co-Cr-Mo, and Ti-6A1-4V) yielded "dry" Gc values one order of magnitude greater than those measured with interfaces formed with uncoated metals. Moreover, the strength of precoated SS316LVM/cement interfaces formed with all three brands of cement did not change after saline immersion for 60 days.
为了表征干骺端型金属植入物与骨水泥之间界面的强度，采用了一种断裂力学参数。该参数即临界应变能释放率（Gc），通过圆柱形试样的“推出”试验来确定。使用骨模具制成的试样，在体温条件下进行养护和测试。与围绕水泥套的松质骨形成的界面强度，显著低于与皮质骨贴合形成的界面强度。对于由Zimmer常规型、Simplex-P型和Zimmer LVC型骨水泥形成的SS316LVM/骨水泥界面，发现盐水浸泡会导致强度显著下降。浸泡60天后，界面Gc仅为块状骨水泥值的10% - 20%。由薄膜聚甲基丙烯酸甲酯预涂覆金属（SS316LVM、钴铬钼合金和钛 - 6铝 - 4钒）形成的界面，其“干”Gc值比未涂覆金属形成的界面测得的值大一个数量级。此外，由所有三种品牌骨水泥形成的预涂覆SS316LVM/骨水泥界面强度，在盐水浸泡60天后没有变化。
