基于多传感器的可穿戴式足底压力测试系统研发及临床应用

Development and clinical application of a wearable plantar pressure measurement system based on multi-sensors

目的:研发基于多传感器的可穿戴式足底压力测试系统,用于下肢及足部疾病康复的静态及动态足底压力检测,为准确制定个性化临床康复治疗方案提供参考依据。方法:基于文献回顾选取足底压力分布关键点位,根据人体足底形态设计检测模块,根据检测模块关键点分布设置Flexiforce压力传感器,选用Cortex-M3微控制器作为系统主控芯片,采用串口通信方式进行数据接收、均值滤波方法对数据进行处理;并通过对110名健康青年志愿者进行足底压力检测,测试该系统的评估信度和效度。结果:研发的可穿戴式足底压力测试系统测得的志愿者足底不同部位压力分布趋势为:足跟>第3跖骨>第1跖骨>第5跖骨,左右两侧足底压力的平均值分布相似,男性与女性志愿者的足底分布趋势基本相同。不同性别的志愿者中,男性志愿者第1跖骨压力分布左、右两侧足比较无统计学差异,其余第3、第5跖骨和足跟部位压力两侧比较均有显著性差异(t=4.591,t=-3.561,t=-2.426;P<0.05);女性志愿者足跟部位压力两侧比较无统计学差异,其余部位两侧比较差异有统计学意义(t=-2.536,t=3.059,t=-3.19;P<0.05)。对同一名志愿者在不同时间重复测量3次的结果进行比较无差异,不同时间进行的测量具有可重复性。结论:基于多传感器的可穿戴式足底压力测试系统能够准确反映出不同性别志愿者足部不同部位的压力值差异,且该系统具有良好的重测信度。

Objective: To develop a wearable plantar pressure measurement system, that could be applied in static and dynamic plantar pressure measurement in the rehabilitation of patients with lower limb or podiatric disease, based on multi-sensors so as to provide reference for accurate formulating personalized clinical rehabilitation schedule. Methods: Several key points of plantar pressure measurement were selected based on literature review. And according to morphology of human foot to design measurement module, and according to the distribution of key points of measurement module to set up Flexiforce pressure sensors. Cortex-M3 micro controller was used as main control chip of system. And serial port communications was adopted to implement data reception, and mean value filter was applied to implement data processing. 110 healthy young volunteers were implemented plantar pressure measurement, and the reliability and validity of this system was examined. Results: The trend of pressure distribution on the differently plantar parts of volunteers, that were detected by the developed wearable measurement system, was as follows: heel pressure > the third metatarsal bone > the first metatarsal bone > the fifth metatarsal bone. The distribution of mean values of plantar pressure between left and right sides was similar. The trends of distribution of different plantar parts of male and female were basically similar. For male volunteers, the difference of the pressure distribution of first metatarsal bone between left and right side of foot was no significant, while the differences of pressure distributions of the third, the fifth metatarsal bone and heel between the two sides were significant(t=4.591, t=-3.561, t=-2.426, P<0.05), respectively. For female volunteers, the difference of pressure distribution of heel between two sides was no significant, while the differences of other parts between the two sides were significant(t=-2.536, t=3.059, t=-3.19, P<0.05), respectively. Three measurements were conducted on each participant at different time and the results showed there was no difference among three measurements. And the measurements at different time have repeatability. Conclusion: This wearable plantar pressure measurement system based on multi-sensors can accurately reflect the differences of distribution values of plantar pressure of different points between different gender, and this system has better test-retest reliability.