Prosthetics Part II Flashcards
who would use a constant friction knee?
long time user
disadvantages of constant friction knee
fixed cadence
very unstable
constant friction knee stance and swing control
stance control: muscular control and alignment
swing control: minimal flex/ext by adjusting amount of mechanical friction; can have ext assist
weight activated stance control and swing control
stance control: moderate mechanical
swing control: swing control by friction and can add extension assist
indications of weighted activated stance control
weaker pt with some inability to control the knee
stance and swing control of polycentric knee
moderate alignment
can have ext assist or hydraulic add ons
indications of polycentric knee
knee disarticulation for cosmesis
someone who needs some knee control but is very active
those that require greater stability due to short residual limb or weak hip extensors
disadvantage of polycentric knee
lacks cadence response
fluid controlled knee stance control and swing control
stance control: mechanical and muscular
swing control: mechanical with flex resist and ext resist
indications for hydraulic/pneumatic knee
active ambulator with variable cadence
sports
advantages of hydraulic/pneumatic knee
cadence responsive
step over step running
disadvantages of hydraulic/pneumatic knee
cold temp can affect oil
pneumatic lower precision
benefit of microprocessor knee
true cadence responsive
smooth step over step pattern during stair descent and downhill ambulation
translational alignment focuses on…
forces
angular alignment focuses on…
forces and angles
