足関節中立位および背屈位における足アーチ部の3次元運動解析(機械力学,計測,自動制御)

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We evaluated the joint related to the arch of the foot to study the arch transformation pattern under different ankle position. Five fresh-frozen cadaveric lower legs were used. Each specimen was amputated at abous 150 mm from talocrural joint surface, and unnecessary dorsal soft-tissue of the foot excluding cardinal tendons was removed. The Direct Linear Transformation (DLT) technique was developed to determine three-dimensional motion of joints composed the arch of the foot during 0 (neutral) and 10 degrees dorsiflexion position under vertical load application. Results show that the arch transformation pattern at the neutral ankle position were planterfixion and eversion of calcaneus and dorsiflexion and eversion of transverse tarsal joint. In neutral position, cuneonavicular and tarsometatarsal joint motion were small. In ankle dorsiflexion, hindfoot and transverse tarsal joint were moved same pattern of the neutral position, cuneonavicular and tarsometatarsal joint motion were increased than neutral position.
2002-04-25