You are attempting to dynamically align gentleman's transtibial prosthesis. Your goal in doing so is to encourage an external knee flexion moment from Initial Contact through Loading Response; however, this need not be too excessive. In order to do this, you balance the effects of the Ground Reaction Force components to contribute in the following manner:

GRFX$$ contributes toward an external ankle Plantarflexion and external knee Flexion Moment.

GRFY$$ contributes toward an external ankle Plantarflexion and external knee Extension Moment.

e$)$ Draw the GRFx$$ at the point at which the GRF is contacting the foot. $($center of pressure$)$

f$)$ Draw the GRFy at the point at which the GRF is contacting the foot. $($center of pressure$)$

g$)$ What must the relationship be between the external knee moments in order for you to meet your alignment goal? h$)$ What is the resulting internal moment being experienced at the knee? $($How would this individual's body be responding and attempting to control the motion induced by your prosthetic alignment? What kind of net internal moment is the patient producing with his muscles in order to control the net effects of these external loads?$)$

i$)$ How would he do this?

j$)$ If he could not control the prosthesis effectively with your suggestions in parts $"$h $\backslash$& $1,$ what else could HE do to counteract the external knee flexion moment experienced on his leg? $($name at least $(2)$ different things$)$ Why would these be effective?

k$)$ Clearly describe how YOU $($the prosthetist$)$ can affect the magnitudes of these external moments. You are attempting to dynamically align gentleman's transtibial prosthesis. Your goal in doing so is to encourage an external knee flexion moment from Initial Contact through Loading Response; however, this need not be too excessive. In order to do this, you balance the effects of the Ground Reaction Force components to contribute in the following manner:

GRFx contributes toward an external ankle Plantarflexion and external knee Flexion Moment.

GRF $\backslash (\_\{$Y$\}\backslash )$ contributes toward an external ankle Plantarflexion and external knee Extension Moment.

e$)$ Draw the GRF $\backslash (\backslash$mathbf$\{$x$\}\_\{\backslash$mathbf$\{$x$\}\}\backslash )$ at the point at which the GRF is contacting the foot. $($center of pressure$)$

f$)$ Draw the GRFy at the point at which the GRF is contacting the foot. $($center of pressure$)$

g$)$ What must the relationship be between the external knee moments in order for you to meet your alignment goal? $($i$.$e$.$ are they equal? is one greater than the other? if so$,$ which one is greater$/$lesser and $...$ Why?

h$)$ What is the resulting internal moment being experienced at the knee? $($How would this individual's body be responding and attempting to control the motion induced by your prosthetic alignment? What kind of net internal moment is the patient producing with his muscles in order to control the net effects of these external loads?$)$

i$)$ How would he do this?