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The mechanism of force transference in feet of children ages two to six
1National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, PR China.
Insights
This study developed an algorithm to measure plantar force in children aged 2-6. Findings reveal developing foot arches and shifting force distribution patterns as children grow, crucial for understanding gait development.
Area of Science:
- Biomechanics
- Pediatric Gait Analysis
- Human Locomotion
Background:
- Understanding pediatric foot development is crucial for identifying potential gait abnormalities.
- Plantar force distribution analysis provides insights into the biomechanical function of the foot during walking.
- Limited data exists on the quantitative changes in plantar force transference during early childhood.
Purpose of the Study:
- To design and validate an algorithm for quantifying plantar force transference in children aged 2-6 years.
- To analyze the developmental changes in relative force-time integral (FTIrel) distribution across different foot regions.
- To investigate the role of developing foot arches in force transmission during gait.
Main Methods:
- Recruited 319 healthy children (ages 2-6) with normal gait and BMI.
- Measured plantar force distributions, dividing the foot into ten regions.
- Calculated relative force-time integral (FTIrel) for each region to assess force transference.
Main Results:
- FTIrel significantly transferred along transverse and longitudinal arches.
- Children aged 2-3 showed forefoot/toe loading with posterior-to-anterior force shift.
- Children aged 5-6 exhibited heel loading with anterior-to-posterior and lateral-to-medial force shifts.
- Mid-foot loading decreased with age, indicating arch development.
Conclusions:
- The developed algorithm effectively quantifies plantar force transference in children.
- Foot arch development (transverse and longitudinal) begins in toddlerhood.
- Arches are vital for the windlass mechanism and facilitate force transference during walking, crucial for normal gait development.
Abstract:
The aim of this study was to design an algorithm to quantify the plantar force transference of children from ages 2-6. In total, 319 healthy children without abnormal gait patterns, foot deformities or injuries, able to walk independently, and with normal BMIs were recruited, and their plantar force distributions were measured. Their plantar areas were divided into ten parts: the hallux, toes #2-5, the first to fifth metatarsal heads (1st-5th MTH), the mid-foot (MF), medial heel (MH) and lateral heel (LH), in which a relative force-time integral (FTIrel) (%) was calculated. Our results show that the FTIrel was significantly transferred along either the transverse or longitudinal arches. The middle of the forefoot and the toe areas were the two main loading regions in children aged 2-3, and posterior to anterior FTIrel shifting was typical. However, anterior to posterior and lateral to medial FTI transferences were found in children aged 5-6, and major loading was found in the heel area. Further, loading in the mid-foot varied with the child's development and was observed to tend to decrease over time. Overall, according to the algorithm designed in this study, these results demonstrated that the development of the arches, both in transverse and longitudinal directions, had already begun in early stages of toddlerhood. Meanwhile, the arches were an important attractor engaged in the windlass mechanism while walking, and they played a major role as bridges to promote posterior to anterior and medial to lateral force transference.
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