Sesselmann Stefan, Hong Yutong, Schlemmer Frank, Wiendieck Kurt, Söder Stephan, Hussnaetter Isabell, Müller Lutz Arne, Forst Raimund, Wierer Thomas
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Biomed Tech (Berl). 2017 May 24;62(3):271-278. doi: 10.1515/bmt-2015-0172.
In a previous radiostereometric analysis (RSA) of the Lubinus SP II (Link, Hamburg, Germany), which is one of the most often used cemented hip stems worldwide, our research group detected a very small but statistically significant distal migration of -0.03±0.17 mm 2 years after surgery compared to the postoperative radiograph. Maximum subsidence occurred between 6 and 12 months. The implant appeared to have stabilized after 2 years. The mean value of maximum total point motion (MTPM) was 0.99±0.69 mm, which was detected 2 years after surgery. The purpose of this study was to analyze the migration pattern and to verify the predictive value of short-term RSA of the Lubinus SP II stem after 10 years. After a follow-up of 5 and 10 years, 38 and 27 out of 100 patients remained available for further assessment, respectively. No statistically significant implant translation or rotation was found along or about the axes of the global coordinate system 5 and 10 years after surgery with respect to the postoperative radiograph. Furthermore, the MTPM was stable in both follow-up periods. The results suggest that the Lubinus SP II hip stem is still stable 10 years after surgery, supporting that determining prognosis by short-term RSA follow-up of 2 years could be an appropriate tool for appraisal of implant behavior 10 years after surgery.
在先前对Lubinus SP II（德国汉堡的Link公司生产）进行的放射立体测量分析（RSA）中，Lubinus SP II是全球使用最频繁的骨水泥型髋关节柄之一，我们的研究小组发现，与术后X光片相比，术后2年时假体出现了非常小但具有统计学意义的向远端迁移，迁移量为-0.03±0.17毫米。最大下沉发生在术后6至12个月之间。假体在2年后似乎已稳定。最大总点运动（MTPM）的平均值为0.99±0.69毫米，这是在术后2年时检测到的。本研究的目的是分析Lubinus SP II柄10年后的迁移模式，并验证其短期RSA的预测价值。在随访5年和10年后，100例患者中分别有38例和27例仍可进行进一步评估。术后5年和10年时，相对于术后X光片，在全局坐标系的轴向上或围绕该轴未发现具有统计学意义的假体平移或旋转。此外，在两个随访期内MTPM均保持稳定。结果表明，Lubinus SP II髋关节柄在术后10年时仍保持稳定，这支持了通过2年的短期RSA随访来确定预后可能是评估术后10年假体行为的合适工具。
