肌力对足关节接触特征影响的生物力学研究

目的 探究足踝体外生物力学实验中肌力对足关节接触力、峰值压强以及接触面积的影响,为选择合适的加载方式提供依据。 方法 踝关节中立位状态下,对新鲜小腿和足离体标本分别进行有无肌力两种方式加载,测量加载状态下第 1 跖趾关节、第 2 跖趾关节、第 1 跖楔关节、第 2 跖楔关节、内侧楔舟关节、中间楔舟关节、距舟关节、跟骰关节、距下关节(后关节面)以及胫距关节的接触力、峰值压强和接触面积,并对结果进行对比分析。 结果 与无肌力加载状态相比,进行肌力加载时足第 1 跖趾关节、第 2 跖趾关节、第 1 跖楔关节、第 2 跖楔关节、内侧楔舟关节、中间楔舟关节、距舟关节和胫距关节的关节接触力均显著增大( P < 0. 05),变化百分比分别为 719. 28%、311. 37%、128. 67%、50. 82%、54. 89%、57. 63%、79. 98% 和 50. 34% ;足第 1 跖趾关节、第 1 跖楔关节和距舟关节的关节峰值压强显著增大(P<0. 05),变化百分比分别为 176. 14%、62. 91% 和 40. 07% ;足第 1 跖趾关节、第 1 跖楔关节、中间楔舟关节以及距下关节(后关节面) 的关节接触面积均显著增大( P < 0. 05),变化百分比分别为 132. 20%、55. 41%、30. 97% 和 26. 87% 。 结论 足踝标本生物力学实验中,进行肌力加载对足各关节的关节接触力、峰值压强或接触面积均产生显著影响,前足表现尤甚。 在进行相关体外标本研究时,需要考虑肌力加载对足踝受力情况的影响,为足踝生物力学实验提供参考。

Biomechanical Study on the Effect of Muscle Strength on ContactCharacteristics of Foot Joints

Objective To explore the effect of mucle force on contact force, peak pressure and contact area of foot joint in in vitro biomechanical experiment of foot and ankle, so as to provide references for choosing appropriate loading modes. Methods In neutral position of the ankle joint, fresh calf and foot specimens were simulated with or without mucle force loading. The contact force, peak pressure and contact area of the 1st metatarsophalangeal joint, the 2nd metatarsophalangeal joint, the 1st tarsometatarsal joint, the 2nd tarsometatarsal joint, the medial cuneonavicular joint, the intermediate cuneonavicular joint, the talonavicular joint, the calcicocuboid joint, the subtalar joint ( posterior articular surface) and the tibiotalar joint of normal foot under loading were measured, the results are compared and analyzed. Results Under muscle force loading, the contact force of the 1st metatarsophalangeal joint, the 2nd metatarsophalangeal joint, the 1st tarsometatarsal joint,the 2nd tarsometatarsal joint, the medial cuneonavicular joint, the intermediate cuneonavicular joint, the talonavicular joint and the tibiotalar joint were significantly greater than those without muscle force loading (P<0. 05), and the change percentages were 719. 28% , 311. 37% , 128. 67% , 50. 82% , 54. 89% , 57. 63% ,79. 98% and 50. 34% , respectively. The peak pressures of the 1st metatarsophalangeal joint , the 1st tarsometatarsal joint and the talonavicular joint under muscle force loading were significantly higher than those without muscle force loading ( P < 0. 05), and the change percentages were 176. 14% , 62. 91% and 40. 07% ,respectively. The contact area of the 1st metatarsophalangeal joint, the 1st tarsometatarsal joint, the intermediate cuneonavicular joint and the subtalar joint ( posterior articular surface) under muscle force loading increased significantly (P<0. 05), and the change percentages were 132. 20% , 55. 41% , 30. 97% and 26. 87% , respectively. Conclusions In biomechanical experiment of foot and ankle specimens, muscle force loading has a significant effect on contact force, peak pressure and contact area of each foot joint, especially the forefoot.Therefore, it is necessary to consider the effect of muscle force loading on stress of foot and ankle in the study ofrelated in vitro specimens