[Purpose] The purpose of this study was to determine the relationship between navicular
drop and plantar flexion torque of the first and second-fifth metatarsophalangeal joints.
[Subjects] Ten healthy young men participated in this study. [Methods] The Pearson
product-moment correlation coefficient was calculated to determine the relationship
between navicular drop and plantar flexion torque of the first and second-fifth
metatarsophalangeal joints. [Results] Significant negative correlations were observed
between navicular drop and plantar flexion torques in the lengthened position of the
intrinsic toe plantar flexion muscles, but no correlations were found between navicular
drop and plantar flexion torques in the neutral position of the ankle and
metatarsophalangeal joints. Moreover, the intrinsic toe plantar flexion muscles were found
to contribute to the formation of the medial longitudinal arch. [Conclusion] Navicular
drop correlates with metatarsophalangeal joint muscle strength in plantar flexion where
the intrinsic toe muscles are capable of exerting force.
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