Surgical and Orthopaedic Research Laboratories, University of New South Wales, Sydney, New South Wales, Australia.
J Arthroplasty. 2011 Dec;26(8):1540-8. doi: 10.1016/j.arth.2011.01.013. Epub 2011 Mar 16.
Cement within cement revisions provide substantial benefits for conventional revision yet remains uncommon possibly because of the perceived weakness of the cement-cement interface. This study investigated the flexural strength of beams composed of 2 different cements, exploring the factors of pore size, fracture location, viscosity, and the surface roughness of the interface. We found no significant difference when comparing combinations of different cements (P = .30), varying pore sizes (P = .13), or surface roughness (P = .39). Differences in fracture locations and viscosity combinations approached statistical significance (P = .08 and .05, respectively). Our findings suggest strong bonding between cements at the interface, with other factors being more important causes of weakness. Thus, we recommend that the strength of the cement-cement interface should not be a factor when considering such revisions.
水泥内水泥翻修为常规翻修提供了实质性的益处，但仍然不常见，可能是因为人们认为水泥-水泥界面的强度较弱。本研究探讨了由 2 种不同水泥组成的梁的弯曲强度，研究了孔径、断裂位置、粘度和界面粗糙度等因素。我们发现不同水泥组合（P =.30）、不同孔径（P =.13）或表面粗糙度（P =.39）之间没有显著差异。断裂位置和粘度组合的差异接近统计学意义（分别为 P =.08 和.05）。我们的研究结果表明，界面处水泥之间具有很强的结合力，其他因素是导致强度较弱的更重要原因。因此，我们建议在考虑此类翻修时，不应将水泥-水泥界面的强度作为一个因素。
