Song Meiling, Wen Jian, Wang Zhe, Zeng Yu, Lu Jun, Lu Wei, Chen Changsheng, Dong Xieping
Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, JXHC Key Laboratory of Digital Orthopedics, Nanchang, 330006, China.
Ruijin Hospital of Traditional Chinese Medicine, Ruijin, 342500, China.
BMC Musculoskelet Disord. 2025 May 31;26(1):535. doi: 10.1186/s12891-025-08756-z.
To explore the biomechanical properties of a four-dimensional structure locking osteosynthesis plate that can alter its structure and functionality over time.
According to the AO classification (AO-A2) standard, 18 artificial femoral shaft oblique fracture models with the same position and shape were generated and subsequently randomly divided into 2 groups (n = 9). In the experimental group, the four-dimensional locking plate was fixed, and in the control group, the locking plate was fixed. In vitro loading experiments were carried out under three conditions: 1400 N axial compression, 500 N internal and external four-point bending, and 15 N·m torsion. The average compression stiffness, average bending stiffness, average torsional stiffness, and displacement were compared between the two groups.
Under vertical loading, the average compression stiffness of the experimental group (558.7 ± 39.1) N/mm was greater than that of the control group (548.8 ± 24.5) N/mm, (P = 0.73); and the average displacement of the fracture end of the experimental group (3.3 ± 0.2) mm was lower than that of the control group (3.4 ± 0.3) mm, (P = 0.47). The differences were not statistically significant. Under four-point bending loading, the average bending stiffness of the experimental group (466.6 ± 85.8) N/mm was lower than that of the control group (542.5 ± 43.2) N/mm, and the difference was not statistically significant (P = 0.24). The average displacement of the fracture ends in the experimental group (1.6 ± 0.2)mm was greater than that in the control group (1.2 ± 0.1)mm, and the difference was statistically significant (P = 0.02). Under torsional loading, the average torsional stiffness of the experimental group (1.0 ± 0.1) N·m/deg was lower than that of the control group (1.1 ± 0.1) N·m/deg, (P = 0.27); and the average angular displacement of the fracture end of the experimental group (15.9 ± 1.3) deg was greater than that of the control group (14.6 ± 1.3) deg, (P = 0.26). There was no significant difference between the two groups.
The anti-compression, anti-bending and anti-torsion properties of four-dimensional locking plates are similar to those of conventional locking plates and can meet the mechanical requirements of internal fracture fixation.
探讨一种可随时间改变其结构和功能的四维结构锁定接骨板的生物力学性能。
按照AO分类（AO-A2）标准，制作18个位置和形状相同的人工股骨干斜形骨折模型，随后随机分为2组（n = 9）。实验组采用四维锁定接骨板固定，对照组采用普通锁定接骨板固定。在三种条件下进行体外加载实验：1400 N轴向压缩、500 N内外四点弯曲和15 N·m扭转。比较两组的平均压缩刚度、平均弯曲刚度、平均扭转刚度和位移。
在垂直加载下，实验组的平均压缩刚度为（558.7±39.1）N/mm，大于对照组的（548.8±24.5）N/mm，（P = 0.73）；实验组骨折端的平均位移为（3.3±0.2）mm，低于对照组的（3.4±0.3）mm，（P = 0.47）。差异无统计学意义。在四点弯曲加载下，实验组的平均弯曲刚度为（466.6±85.8）N/mm，低于对照组的（542.5±43.2）N/mm，差异无统计学意义（P = 0.24）。实验组骨折端的平均位移为（1.6±0.2）mm，大于对照组的（1.2±0.1）mm，差异有统计学意义（P = 0.02）。在扭转加载下，实验组的平均扭转刚度为（1.0±0.1）N·m/deg，低于对照组的（1.1±0.1）N·m/deg，（P = 0.27）；实验组骨折端的平均角位移为（15.9±1.3）deg，大于对照组的（14.6±1.3）deg，（P = 0.26）。两组之间无显著差异。
四维锁定接骨板的抗压、抗弯和抗扭性能与传统锁定接骨板相似，能够满足骨折内固定的力学要求。
