Chapter 22: Biomechanics of the Hip, Knee, and Ankle Flashcards
What is the equation for Pressure?
Force/Area
The function of an orthosis is to resist or control what?
Angular motion at the joint.
What is a moment?
A force acting at a distance from a joint center creates a “turning effect”
What is the equation for the magnitude of the moment?
Moment=ForceXDistance
What are the five attributes of normal walking?
Foot clearance in swing Adequate step length Prepositioning of the foot at initial contact Stability in stance Conservation of energy.
Where is the GRF at initial contact at the hip, knee, and ankle?
Hip: Anterior
Knee: Anterior
Ankle: Posterior
Where is the GRF at Loading response at the hip, knee, and ankle?
HIp: Anterior
Knee: posterior
Ankle: posterior
Where is the GRF during midstance at the hip, knee, and ankle?
Hip: Posterior
Knee: anterior
Ankle: anterior
Where is the GRF during terminal stance at the hip, knee, and ankle?
Hip: Posterior
Knee: anterior
ankle: anterior
Where is the GRF during preswing at the hip, knee, and ankle?
Hip: posterior
Knee: posterior
Ankle: anterior.
What are examples of unijointed muscles?
Psoas and soleus
What are examples of bijointed muscles?
the long hamstrings and rectus femoris
What is an example of a trijointed muscle?
Gastrocnemius
