Schlegel Ulf J, Püschel Klaus, Morlock Michael M, Nagel Katrin
Center for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstr 200a, Heidelberg, 69118, Germany.
J Orthop Surg Res. 2014 Nov 29;9:123. doi: 10.1186/s13018-014-0123-2.
Improvements to enforce primary fixation in cemented total knee arthroplasty have been suggested to be a key issue for long-term survival. In this context, it has been questioned whether specific implant design features influence bone cement morphology and hence primary interface strength. The purpose of this study was to investigate in vitro the influence of cement pockets on the tibial tray on cement penetration in the tibia.
Eight paired cadaveric, human tibiae were available for investigation. One side of a pair was implanted with a fixed bearing tibial tray (FB) featuring cement pockets on the undersurface, while in the other side, a mobile bearing platform (MB) without cement pockets was used. Specimens underwent computed tomography analysis of the cement morphology as well as BMD assessment.
While bone cement layer between implant and bone surface was thicker in the FB group (p = 0.032), bone cement penetration was not influenced by implant design (p = 0.529).
The present study suggests that cement pockets do not alter or enforce bone cement penetration under the tibial tray in an in vitro scenario.
在骨水泥型全膝关节置换术中，加强初次固定的改进措施被认为是长期生存的关键问题。在这种情况下，有人质疑特定的植入物设计特征是否会影响骨水泥形态，进而影响初次界面强度。本研究的目的是在体外研究胫骨托上的骨水泥袋对胫骨中骨水泥渗透的影响。
有八对配对的尸体人类胫骨可供研究。一对胫骨的一侧植入了在下表面具有骨水泥袋的固定承重胫骨托（FB），而另一侧则使用了没有骨水泥袋的活动承重平台（MB）。对标本进行骨水泥形态的计算机断层扫描分析以及骨密度评估。
虽然FB组中植入物与骨表面之间的骨水泥层更厚（p = 0.032）, 但骨水泥渗透不受植入物设计的影响（p = 0.529）。
本研究表明，在体外情况下，骨水泥袋不会改变或增强胫骨托下的骨水泥渗透。
