Department of orthopedics, The Second Hospital of Tangshan, Hebei, China.
Department of orthopedics, The Second Hospital of Tangshan, Hebei, China.
Orthop Traumatol Surg Res. 2022 Dec;108(8):103340. doi: 10.1016/j.otsr.2022.103340. Epub 2022 May 25.
There appears to be a paucity of knowledge about the biomechanics of locking plates for the fixation of metacarpal shaft fractures. A thorough understanding of the biomechanics of locking plates is needed to apply them correctly, optimize outcomes, and avoid complications. The purpose of this study is to investigate the biomechanics of the fixation of metacarpal fractures using locking plate-screw constructs with different numbers of screws.
The difference in the number of screws in the locking plate influenced the biomechanical outcome of the metacarpal fracture.
Finite element models of third metacarpal fractures with locking plate-screw constructs were established, and the magnitude and distribution of their stresses and displacements were investigated when a vertical load of 100N was applied.
For the metacarpal fracture with a locking plate and screws, the stress in the metacarpal was largely shared by the plate-screw construct. For the plate-screw construct, the stress is concentrated in the area close to the fracture line, and the 6-screw Group has the lowest failure risk since it has the lowest plate stress and the second-lowest screw stress. The implant-bone construct with 8 screws has better biomechanical stability because of minimal displacement, but increased stress on both the metacarpal bone and the screws, leading to increased failure rates.
The stresses in the metacarpal were mostly shared by the plate-screw constructs and the screws closest to the fracture line were the most likely to break or loosen. For the implant-bone constructs, the locking plate with 2 screws was the most vulnerable to break or loosen, whereas the locking plate with 6 screws was the least likely to break or loosen. The implant-bone construct with 8 screws had better biomechanical stability, but the stresses in both the metacarpal and the screws were increased, which increased the risk of failure.
IV, basic science study.
对于掌骨干骨折固定用锁定钢板的生物力学，人们的了解似乎很少。为了正确应用、优化结果并避免并发症，需要对锁定钢板的生物力学有透彻的了解。本研究旨在探讨不同螺钉数量的锁定钢板-螺钉结构固定掌骨干骨折的生物力学。
锁定钢板中的螺钉数量的差异会影响掌骨干骨折的生物力学结果。
建立了带有锁定钢板-螺钉结构的第三掌骨干骨折的有限元模型，并在施加 100N 垂直载荷时，研究了它们的应力和位移的大小和分布。
对于带有锁定钢板和螺钉的掌骨干骨折，掌骨的应力主要由钢板-螺钉结构分担。对于钢板-螺钉结构，应力集中在靠近骨折线的区域，6 螺钉组的失效风险最低，因为它的钢板应力最低，螺钉应力第二低。由于位移最小，8 螺钉植入物-骨结构具有更好的生物力学稳定性，但由于掌骨骨和螺钉的应力增加，导致失效率增加。
掌骨的应力主要由钢板-螺钉结构分担，靠近骨折线的螺钉最有可能断裂或松动。对于植入物-骨结构，带有 2 个螺钉的锁定钢板最容易断裂或松动，而带有 6 个螺钉的锁定钢板最不容易断裂或松动。带有 8 个螺钉的植入物-骨结构具有更好的生物力学稳定性，但掌骨和螺钉的应力增加，增加了失效的风险。
IV，基础科学研究。
