Yan Shuang G, Wang Zhi, Cui Yiliang, Liu Fanxiao, Lu Jingtao, Zhang Hui, Li Di
Department of Orthopaedic Surgery, The First Affiliated Hospital of Anhui Medical University, Hefei, China.
Department of Orthopaedic Surgery, Beijing Oriental Electronics Hospital, Hefei, China.
Sci Rep. 2025 Jan 15;15(1):1967. doi: 10.1038/s41598-025-86108-6.
Short-stem total hip arthroplasty (SHA) has become popular because it preserves femoral bone stock and enables the use of short femoral stems in revision total hip arthroplasty (THA). However, no study has evaluated whether a short stem in revision THA, replacing a standard stem, can provide adequate primary stability to facilitate osseous integration. In this biomechanical study, a metaphyseal anchoring SHA (Tri-Lock BPS) stem and a standard THA (Corail) stem were implanted into ten composite femurs and loaded dynamically from 300 to 1700 N with 1 Hz. Primary stability was estimated using three-dimensional (3D) micromotions at five points around the bone-implant interface. A revision scenario was then established by removing the standard stem and implanting the same Tri-Lock BPS stem, with subsequent measurements of 3D micromotions. In the primary scenario, no significant differences in 3D micromotions were noted between the short and standard stems at most of the test points. Compared with the Corail group, the Tri-Lock BPS group presented significantly greater 3D micromotions only at the lateral point of the distal femur (P5: Tri-Lock BPS 32.9 ± 7.54 μm vs. Corail 25.1 ± 4.32 μm; p = 0.011). In the revision scenario, no significant differences in the 3D micromotions were noted between the primary and revision Tri-Lock BPS stems at all test points. Our results show that the SHA (Tri-Lock BPS) offers good primary stability, which is similar to that of the standard THA (Corail). The Tri-Lock BPS stem obtained comparable stability in this revision scenario as in the primary scenario; therefore, it can be assumed that the Corail standard stem can safely be revised with a Tri-Lock BPS short stem.
短柄全髋关节置换术（SHA）已变得流行，因为它能保留股骨骨量，并能在翻修全髋关节置换术（THA）中使用短股骨柄。然而，尚无研究评估在翻修THA中，用短柄替换标准柄能否提供足够的初始稳定性以促进骨整合。在这项生物力学研究中，将一种干骺端锚固型SHA（Tri-Lock BPS）柄和一种标准THA（Corail）柄植入10根复合股骨中，并以1Hz的频率从300N动态加载至1700N。使用骨-植入物界面周围五个点的三维（3D）微动来评估初始稳定性。然后通过移除标准柄并植入相同的Tri-Lock BPS柄来建立翻修情况，并随后测量3D微动。在初始情况下，在大多数测试点，短柄和标准柄之间的3D微动无显著差异。与Corail组相比，Tri-Lock BPS组仅在股骨远端外侧点的3D微动明显更大（P5：Tri-Lock BPS为32.9±7.54μm，Corail为25.1±4.32μm；p = 0.011）。在翻修情况下，在所有测试点，初始和翻修的Tri-Lockock BPS柄之间的3D微动无显著差异。我们的结果表明，SHA（Tri-Lock BPS）提供了良好的初始稳定性，这与标准THA（Corail）相似。Tri-Lock BPS柄在这种翻修情况下获得了与初始情况相当的稳定性；因此，可以假设Corail标准柄可以安全地用Tri-Lock BPS短柄进行翻修。
