Preparatory and after treatment in operative cases . pring mattress is a device intended to give additional re-silience for both toes and heel. Every movement of the foot when inaction, applies pressure to the springs at the heel, ball, or on the counteracting tendency of the strips aids in forcing the foot backto its proper shape as soon as pressure is removed. Fig. 392 shows the rubber foot with the weight applied to the ball as it is when the weareris being urged forwardwhile walking. Thespring mattress is nowforced upward at theball and the sponge rub-ber is compressed aboveand b
Preparatory and after treatment in operative cases . pring mattress is a device intended to give additional re-silience for both toes and heel. Every movement of the foot when inaction, applies pressure to the springs at the heel, ball, or on the counteracting tendency of the strips aids in forcing the foot backto its proper shape as soon as pressure is removed. Fig. 392 shows the rubber foot with the weight applied to the ball as it is when the weareris being urged forwardwhile walking. Thespring mattress is nowforced upward at theball and the sponge rub-ber is compressed aboveand below the pressure pulls themattress forward in thefoot. These movements—the yielding of thespring, the compressionof the rubber, and thepulling of the spring mattress forward—form a very powerful result-ant force that brings the foot back to its original lines as soon as thefoot is relieved of weight. The condition of the appliance when under heel pressure, as it iswhen the wearer places the artificial limb forward and applies his. a. a. marks, n. y. Fig. 392.—Position of Rubber Foot WhenWalking. 616 ARTIFICIAL LIMBS weight upon it, is somewhat the same. The spring mattress is forcedupward, the sponge rubber is compressed above and below, the heel becomes flattened, andthe mattress being pulledlengthwise, all combineto force the foot to itsshape as soon as pressureon the heel is compression of theheel permits the toes andthe front part of the footto reach the ground,while the shaft of the legis obliquely back of thevertical line. Fig. 393shows the foot on an in-clined surface. On ac-count of the yielding quality of the rubber, the up-hill side of the footwill compress and accommodate itself to the incline and allow the footto remain on its base. This is accomplished without complicatedmechanical lateral articulation. It can readily be seen that any motion in the ankle that cannot becontrolled by the will must be mechanical in action. The approach
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1910
