跖趾关节伸展对足底软组织硬度和厚度的影响。
Effect of metatarsal phalangeal joint extension on plantar soft tissue stiffness and thickness.
作者信息
Garcia Christopher A, Hoffman Shannon L, Hastings Mary K, Klaesner Joseph W, Mueller Michael J
机构信息
Program in Physical Therapy, Washington University School of Medicine, Campus Box 8502, 4444 Forest Park Boulevard, St. Louis, MO 63108-2212, USA.
出版信息
Foot (Edinb). 2008 Jun;18(2):61-7. doi: 10.1016/j.foot.2007.12.002.
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.
背景
足底软组织的硬度和厚度是理解可能导致组织损伤的应力集中的重要生物力学变量。
目的
本研究的目的是确定被动跖趾关节（MPJ）伸展对足底软组织硬度和厚度的影响。
方法
对17名健康参与者（7名男性，10名女性，平均年龄25.3岁，标准差4.4岁，平均BMI 24.7kg/m²，标准差3.2kg/m²）进行测试。使用定制的压痕装置和超声仪在跖骨头、中足和足跟处测量足底软组织的硬度和厚度。
结果
与MPJ中立位相比，MPJ伸展位时跖骨头和中足处的软组织硬度指标（K1值）显示硬度增加了81%-88%（标准差20%-33%）。MPJ中立位时跖骨头处的软组织厚度测量值平均为8.9至13.5mm，MPJ伸展时平均减少了8.8%（标准差2.9%）。
结论
MPJ伸展对增加前足足底软组织硬度有显著影响，对减少软组织厚度有一致但微小的影响。这些变化可能有助于根据绞盘机制理论在蹬离期将足部转变为刚性杠杆。
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