Displacements of bones during bending test of first metatarsophalangeal joint after arthrodesis with medially or dorsally positioned locking plate and lag screw.

The Dataset contains the values of displacements of bone control points during the bending test of first metatarsophalangeal (MTP1) joint specimens after arthrodesis. Three groups of samples were created depending on the MTP1 arthrodesis method: - group with medially positioned locking plate, samples P01-P02, P04-P07, P22;- group with dorsally positioned locking plate and lag screw, samples P08-P14;- group with medially positioned locking plate and lag screw, samples P15-P21.The same short titanium locking plate (Medgal) and six 2.4 mm locking screws were used in all groups. The artificial models of metatarsal bone and proximal phalanx were created based on freely accessible STL geometry of the human foot (https://www.thingiverse.com/thing:22628). The geometry was scaled and cut to prepare bones for arthrodesis and fixation in dedicated steel jigs. The artificial bone models were additively manufactured with the fused filament fabrication (FFF) method using polylactide (PLA) material in Ultimaker 3 Extended 3D printer. The bending test of total 21 samples was performed in a Zwick/Roell Z10 universal testing machine (UTM). The shaft of the metatarsal bone was clamped in stainless steel jig, while the“distal” end of the proximal phalanx was fixed in stainless steel clamp, which was connected to a traverse of UTM. A preload of 1 N and constant vertical displacement increment of 5 mm/min of the traverse were applied in the tests to simulate quasi static loading conditions. The tests were stopped after specimens failure. Digital image correlation (DIC) method and ARAMIS MC 3D 12M system were used to measure displacements at three control points P1, P2 and P3, see Figure. The displacements between points P1 and P2 allow to calculate the relative displacements between the bones. The file has (.txt) extension and contains: - the time of the test (in s, 1nd column);- displacement in X direction of point P1 (in mm, 2nd column), P2 (in mm, 3rd column), P3 (in mm, 4rd column);- displacement in Y direction of point P1 (in mm, 5th column), P2 (in mm, 6th column), P3 (in mm, 7th column);- displacement in Z direction of point P1 (in mm, 8th column), P2 (in mm, 9th column), P3 (in mm, 10th column);- force (in N, 11th column).

本数据集包含第一跖趾关节（first metatarsophalangeal joint, MTP1）标本在关节融合术（arthrodesis）后弯曲试验中的骨骼控制点位移数值。根据MTP1关节融合方式，共设置三组样本：
- 内侧放置锁定钢板（locking plate）组：样本编号为P01-P02、P04-P07、P22；
- 背侧放置锁定钢板加拉力螺钉（lag screw）组：样本编号为P08-P14；
- 内侧放置锁定钢板加拉力螺钉组：样本编号为P15-P21。

所有组别均采用同款短钛锁定钢板（Medgal）及6枚2.4 mm锁定螺钉。
跖骨与近节趾骨的人工模型基于公开可获取的人足STL几何模型（https://www.thingiverse.com/thing:22628）创建，经缩放与裁剪以制备用于关节融合及固定至专用钢制夹具的骨骼试件。人工骨模型采用熔融沉积成型（fused filament fabrication, FFF）工艺，以聚乳酸（polylactide, PLA）为材料，通过Ultimaker 3 Extended 3D打印机完成增材制造。

共计21个样本的弯曲试验在Zwick/Roell Z10万能试验机（universal testing machine, UTM）中开展。试验中将跖骨轴部夹持于钢制夹具内，近节趾骨的“远端”端固定于与试验机横梁相连的钢制夹具中。试验采用1 N的预载荷，且横梁以5 mm/min的恒定垂直位移增量加载，以模拟准静态加载条件。待试件发生失效后停止试验。

采用数字图像相关（digital image correlation, DIC）方法及ARAMIS MC 3D 12M系统，对三个控制点P1、P2、P3的位移进行测量，详见附图。通过P1与P2之间的位移可计算骨骼间的相对位移。

该数据文件后缀为.txt，包含以下内容：
- 试验时长（单位：秒，第1列）；
- 控制点P1、P2、P3的X方向位移（单位：毫米，第2、3、4列）；
- 控制点P1、P2、P3的Y方向位移（单位：毫米，第5、6、7列）；
- 控制点P1、P2、P3的Z方向位移（单位：毫米，第8、9、10列）；
- 载荷力（单位：牛，第11列）。