Effect of metatarsal phalangeal joint extension on plantar soft tissue stiffness and thickness.
Effect of metatarsal phalangeal joint extension on plantar soft tissue stiffness and thickness.
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DOI：
10.1016/j.foot.2007.12.002
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发表时间：
2008-06-01
期刊：
影响因子：
--
通讯作者：
Mueller, Michael J
中科院分区：
文献类型：
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作者：
Garcia, Christopher A;Hoffman, Shannon L;Mueller, Michael J
背景技术背景：足底软组织刚度和厚度是重要的生物力学变量，以了解应力集中，可能有助于组织injure.Objective：本研究的目的是确定被动跖趾关节（MPJ）的影响伸展对足底软组织刚度和thickness.METHODS：17名健康参与者（7男，10女，平均年龄25.3岁，S.D. 4.4年，平均BMI 24.7 kg/m（2），S.D. 3.2 kg/m2）。足底软组织刚度和厚度进行了测量，在跖骨头，中足和脚跟使用定制的indentor设备和超声machine.Results：软组织刚度（K1值）在跖骨头和中足的指标显示增加81-88%（S.D.20-33%）的刚度在MPJ伸展位置相比，MPJ中立位置。MPJ处于中立位时，跖骨头处软组织厚度测量值的平均范围为8.9至13.5 mm，平均减少8.8%（S.D.）。结论：MPJ伸展对增加前足足底软组织刚度具有深远的影响，对减少软组织厚度具有一致但最小的影响。这些变化可能有助于在推出时将脚转变为与绞盘机制理论一致的刚性杠杆。
BACKGROUND: Plantar soft tissue stiffness and thickness are important biomechanical variables to understand stress concentrations that may contribute to tissue injury.OBJECTIVE: The purpose of this study was to determine the effects of passive metatarsal phalangeal joint (MPJ) extension on plantar soft tissue stiffness and thickness.METHODS: Seventeen healthy participants (7 male, 10 female, mean age 25.3 years, S.D. 4.4 years, mean BMI 24.7 kg/m(2), S.D. 3.2 kg/m(2)) were tested. Plantar soft tissue stiffness and thickness were measured at the metatarsal heads, midfoot and heel using a custom-built indentor device and an ultrasound machine.RESULTS: Indicators of soft tissue stiffness (K1 values) at the metatarsal heads and midfoot showed increases in stiffness of 81-88% (S.D.20-33%) in the MPJ extension position compared with the MPJ neutral position. Soft tissue thickness measures at the metatarsal heads with the MPJ in neutral ranged from a mean of 8.9 to 13.5mm and decreased, on average, by 8.8% (S.D. 2.9%) with MPJ extension.CONCLUSIONS: MPJ extension has a profound effect on increasing forefoot plantar soft tissue stiffness and a consistent but minimal effect on reducing soft tissue thickness. These changes may help transform the foot into a rigid lever at push-off consistent with the theory of the windlass mechanism.