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Dorsiflex prosthetic foot
8%
189/2373
Move foot more posterior
23%
552/2373
Increase flexibility/softness of keel
3%
75/2373
Move toe break of prosthesis more posterior
6%
152/2373
Move foot more anterior
58%
1375/2373
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"Drop-off" refers to knee buckling or excessive knee flexion as the limb transitions from midstance (normally knee is extending) to terminal stance (the start of heel-off phase leads to knee flexion). Knee flexion normally occurs along with the passing of the center of gravity over the metatarsophalangeal joints. If the body weight is carried over these joints prematurely, then early knee flexion or "drop-off" occurs. Therefore, any prosthetic variable that decreases anterior support (i.e. dorsiflexed position of prosthetic foot, prosthetic foot too posterior, too flexible/soft of a keel, and a toe break that is placed too posterior) would accentuate this gait abnormality by moving the center of gravity more posterior. See Illustration A for details.
2.7
(38)
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