Numerous quantitatively biomechanical studies measuring the fixation stability of femoral stem using micromotions at the bone-implant interfaces in different directions and levels remain inconclusive. This network meta-analysis performed systematically aims to explore the rank probability of micromotions at the bone-implant interfaces based on biomechanical data from studies published. Two electronic databases, PubMed/MEDLINE and Embase, were utilized to retrieve biomechanical studies providing the data of micromotions at the bone-stem interfaces. After screening and diluting out, the studies that met inclusion criteria will be utilized for statistical analysis. In order to contrast the stability of commonness and differences of the different parts of the femoral stem, the horizontal and vertical comparison of micromotions at the bone-implant interfaces were conducted using the pooled evaluation indexes including the mean difference (MD) and the surface under the cumulative ranking (SUCRA) curve, while inconsistency analysis, sensitivity analysis, subgroup analyses, and publication bias were performed for the stability evaluation of outcomes. Screening determined that 20 studies involving a total of 249 samples were deemed viable for inclusion in the network meta-analysis. Tip point registered the highest micromotions of 13 measurement points. In the horizontal level, the arrangements of 4 measurement points at the proximal (P1–P4), middle (P5–P8) and distal part of the stem (P9–P12) were P1 = P2 = P3 = P4, P7 > P8 > P6 = P5 and P10 ≥ P12 = P9 = P11, respectively. In the vertical level, the arrangements of 3 measurement points at the anterior, posterior, medial, and lateral directions was P9 > P5 = P1, P10 > P6 > P2, P11 > P7 > P3, and P12 > P8 > P4, respectively. The network meta-analysis seems to reveal that the distal part of the femoral stem is easier to register higher micromotion, and tip point of femoral stem registers the highest micromotions.

中文翻译：

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非骨水泥型假体在水平和垂直方向的表面微运动比较：生物力学研究的网络分析。

大量的定量生物力学研究使用不同方向和水平的骨-植入物界面处的微动来测量股骨干的固定稳定性，尚无定论。该网络荟萃分析是系统地进行的，旨在基于已发表研究的生物力学数据来探索骨植入物界面微动的等级概率。利用两个电子数据库，PubMed / MEDLINE和Embase，检索生物力学研究，从而提供骨干界面微动作的数据。筛选并稀释后，符合纳入标准的研究将用于统计分析。为了对比股骨柄不同部位的共同点和差异的稳定性，使用包括平均差异（MD）和累积等级（SUCRA）曲线下的表面在内的综合评估指标对骨-植入物界面处的微动作进行水平和垂直比较，同时进行不一致性分析，敏感性分析，亚组分析和进行出版物偏倚以评估结果的稳定性。筛选确定20项研究（共249个样本）被认为可纳入网络荟萃分析。尖端记录了13个测量点的最高微动。在水平方向上，在茎的近端（P1-P4），中部（P5-P8）和远端（P9-P12）的4个测量点的排列方式为P1 = P2 = P3 = P4，P7> P8> P6 = P5和P10≥P12 = P9 = P11。在垂直层次上 在前，后，内侧和侧向的三个测量点的排列分别为P9> P5 = P1，P10> P6> P2，P11> P7> P3，以及P12> P8> P4。网络荟萃分析似乎表明，股骨干的远端较容易记录较高的微动，而股骨干的尖端则显示出最高的微动。