Effect of thong style flip-flops on children’s midfoot motion during gait
© Chard et al; licensee BioMed Central Ltd. 2012
Published: 10 April 2012
Thong style flip-flop footwear (TH) and sandals are the preferred footwear of 22% of Australian children, however little is known about the effects of wearing TH on the growing child . Previous research has shown TH reduces children’s hallux dorsiflexion prior to contact during walking and jogging and at toe-off whilst jogging . Adult studies have shown TH alters barefoot motion with reduced eversion  and reduce peak plantar-pressure at the hallux, metatarsal heads and calcaneus .The influence of TH on children’s midfoot kinematics may have important ramifications for children’s developing feet. This study aims to describe the effect of TH on children’s midfoot motion during walking and jogging.
Materials and methods
Seven healthy children, mean age 10.47±1.98 years were recruited from Sydney Australia. Participants conducted five walking trials and five jogging trials while barefoot and wearing TH in random order. A fourteen camera, three-dimensional motion analysis system was used to collect kinematic data. Markers located at navicular, first and fifth metatarsal phalangeal joints, hallux and a rearfoot wand, defined three foot segments: rearfoot, forefoot and hallux. The midfoot joint was defined as the articulation between rearfoot and forefoot segments.
During the propulsive phase significantly greater forefoot inversion was seen while jogging wearing TH. Results reported are early findings of an ongoing project. With greater participant numbers the trends of greater forefoot extension, eversion and abduction while walking may become significant.
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