Zhang Faning, Ye Dongqiang, Zhang Xini, Sun Xiaole, Zhang Shen, Wang Shaobai, Fu Weijie
School of Kinesiology, Shanghai University of Sport, Shanghai, China.
School of Physical Education and Training, Shanghai University of Sport, Shanghai, China.
Front Bioeng Biotechnol. 2022 May 16;10:892760. doi: 10.3389/fbioe.2022.892760. eCollection 2022.
The biomechanics of the first metatarsophalangeal joint (MTPJ) is affected by different shoe conditions. In the biomechanical research field, traditional skin marker motion capture cannot easily acquire the joint kinematics of the first MTPJ in shoes. Thus, the present study aims to investigate the differences of the first MTPJ's six-degree-of-freedom (6DOF) kinematics between shod and barefoot running by using a high-speed dual fluoroscopic imaging system (DFIS). In total, 15 healthy male runners were recruited. Computed tomography scans were taken from each participant's right foot for the construction of 3D models and local coordinate systems. Radiographic images were acquired at 100 Hz while the participants ran at a speed of 3 m/s ± 5% in shod and barefoot conditions along an elevated runway, and 6DOF kinematics of the first MTPJ were calculated by 3D-2D registration. Paired sample -tests were used to compare the kinematic characteristics of the first MTPJ 6DOF kinematics during the stance phase between shod and barefoot conditions. Compared with barefoot, wearing shoes showed significant changes ( < 0.05): 1) the first MTPJ moved less inferior at 50% but moved less superior at 90 and 100% of the stance phase; 2) the peak medial, posterior, and superior translation of the first MTPJ significantly decreased in the shod condition; 3) the extension angle of the first MTPJ was larger at 30-60% but smaller at 90 and 100% of the stance phase; 4) the maximum extension angle and flexion/extension range of motion of the first MTPJ were reduced; and 5) the minimum extension and adduction angle of the first MTPJ was increased in the shod condition. On the basis of the high-speed DFIS, the aforementioned results indicated that wearing shoes limited the first MTPJ flexion and extension movement and increased the adduction angle, suggesting that shoes may affect the propulsion of the first MTPJ and increase the risk of hallux valgus.
第一跖趾关节（MTPJ）的生物力学受到不同鞋类条件的影响。在生物力学研究领域，传统的皮肤标记运动捕捉不易获取鞋内第一跖趾关节的关节运动学信息。因此，本研究旨在使用高速双荧光透视成像系统（DFIS），研究穿鞋跑步和赤足跑步时第一跖趾关节六自由度（6DOF）运动学的差异。共招募了15名健康男性跑步者。对每位参与者的右脚进行计算机断层扫描，以构建三维模型和局部坐标系。当参与者在高架跑道上以3 m/s±5%的速度分别在穿鞋和赤足条件下跑步时，以100 Hz的频率采集X线图像，并通过三维-二维配准计算第一跖趾关节的6DOF运动学。采用配对样本检验比较穿鞋和赤足条件下站立期第一跖趾关节6DOF运动学的运动学特征。与赤足相比，穿鞋时出现了显著变化（P<0.05）：1）在站立期50%时，第一跖趾关节向下移动较少，但在90%和100%时向上移动较少；2）在穿鞋条件下，第一跖趾关节的最大内侧、后方和上方平移显著减小；3）在站立期30%-60%时，第一跖趾关节的伸展角度较大，但在90%和100%时较小；4）第一跖趾关节的最大伸展角度和屈伸运动范围减小；5）在穿鞋条件下，第一跖趾关节的最小伸展和内收角度增加。基于高速DFIS，上述结果表明，穿鞋限制了第一跖趾关节的屈伸运动并增加了内收角度，提示鞋子可能影响第一跖趾关节的推进并增加拇外翻风险。
