| 摘要 |
A prosthetic foot is disclosed for improving the gait and comfort qualities of the amputee that participates in walking, running and jumping activities. The prosthetic foot allows hindfoot triplanar motion and has hindfoot, midfoot and forefoot dynamic response, and midfoot and forefoot biplanar motion capabilities. An ankle joint and a subtalar joint provided in the hindfoot permit closed kinetic chain motion of the foot. The ankle and subtalar joints are preferably formed integrally with the hindfoot by respective struts of resilient material of the hindfoot. An arch in the midfoot creates frontal and sagittal plane motion capabilities. The forefoot includes at least one expansion joint hole extending therethrough between dorsal and plantar surfaces. An expansion joint extends forward from the hole to the anterior edge of the forefoot to form plural expansion struts that create improved biplanar motion capability of the forefoot. Concavities and convexities on the surface of the hindfoot, midfoot and forefoot encourage desired motions and motion directions so that the foot functions and feels like a normal foot to the amputee. The forefoot, midfoot and hindfoot portions can be inexpensively formed from a single piece of resilient material such as a semi-rigid plastic as by molding or machining.
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