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Hsu et al., ESAR + VSP appears to have 1999 [31] positive effect on energy cost, gait efficiency, and relative exercise intensity compared with SACH foot and ESAR during walking and running.
Two subjects, a normal and an amputee with a SACH foot prostethics device were selected for this trial, with a height of 170 cm and a mass of 75 kg.
At the end of the first visit, subjects were fitted with the SACH foot (1D10, Ottobock; Duderstadt, Germany), which was aligned by an experienced prosthetist.
Later, the rubber foot, the forerunner of the SACH foot, came into use and eliminated the complicated articulated ankle of the Bly leg.
Pylon/Tube, Sach Foot, Foot Adapter, Bonded Pylon/Pylon With 4 Screw Adaptor 400Mm Polycentric Prosthetic Knee Joint, Socket Adapter, Tes Belt, Foam Cover, Covering Socks, Socket Fabrication And Fitment Charges.
They concluded that subjects with amputation use a hip-extensor dominant strategy on the amputated side during stair ascent, and dynamic response (DR) feet (Flex Foot and Re-Flex VSP [Ossur Inc]) are advantageous over a SACH foot because they reduce the moments and power generation at the hip joint.