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胫骨上端前后缘皮质骨对单髁假体稳定性的影响 |
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王庆一 鲁世宝 李之芳 李放 胥少汀 姜金卫
【摘要】目的 本实验研究胫骨上端前后缘皮质骨对单髁假体稳定性的影响。方法 实验分为三组：A组，正常组；B组，假体前缘未压在皮质骨上；C组，胫骨上端后缘皮质骨破坏。结果 ⒈仅经一次循环，700～900N的负荷就使B组假体的前微动超过2mm，而A组假体经30次循环，981N的负荷使假体的前微动约为400μm。2.A组假体的前微动约为C组的二分之一，后微动约为C组的三分之一。结论 胫骨上端前后缘皮质骨对假体的稳定性非常重要。
【关键词】假体 胫骨 膝关节
Effects of Anterior and Posterior Cortical Bone of Proximal Tibia on the Initial Fixation Stability of Unicompartmental Prosthesis
WANG Qingyi*,LU Shibao,LI Zhifang,et al.
*Beijing Red Cross Chaoyang Hospital Affiliated to the Capital University of Medical Sciences, Beijing 100020
【Abstract】 Objective To investigate the effects of the anterior and posterior cortical bone of the proximal tibia on the stability of the unicompartmental prosthesis. Methods The embalmed human anatomic－specimens of tibia were size－selected and randomly divided into 3 groups.In group A,the fixation of the prosthesis was the same as that used clinically. The anterior part of the prosthesis was placed on the anterior cortical bone of the tibia with the posterior cortical bone intact.In group B, the fixation was similar to that of group A except that the anterior part of the prosthesis was fixed on the cancellous bone.In group C,the anterior part of the prosthesis was fixed on the tibial surface including the anterior cortical bone, but the posterior cortical bone was destroyed. All of the components were implanted into the medial compartments of the tibiae. Results Group B was found to be the worst in the three groups. At the first cycle, the micromotion of group B was higher than 2mm in response to 700～900 N loads. Group A was found to be significantly better than group C,in response to 981 N load, the micromotion was approximately 400μm. Its anterior subsidence was about one half of those in group C and its posterior lift off was about one third of those in group C.Conclusions Both of the anterior and posterior cortical bone of the tibia was very important[1] [2] 下一页
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