LE Orthotics pt. 2 (TD) Flashcards
what is the only knee joint that has stumble recovery?
microprocessor (C-leg)
controls stance and swing
which knee joint can accommodate a flexion contracture?
variable position knee joint
which knee joint is used for excessive knee hyperextension due to quad weakness?
posterior offset knee joint
conventional thermoformed plastic advantages
least costly option
works well when adequately designed
easily post formable
conventional thermoformed plastic disadvantages
not optimal when stiffness and plane control required
requirements for custom fit designs (carbon)
knee extended ankle PROM to 90 deg*
grade 4 or 5 PF strength*
no bony alignment or abnormalities of foot
custom fit designs (carbon) advantages
assess deformation of strut in TERMINAL STANCE
mild to moderate activity level
requirements for custom carbon pre-peg
grade 3 or less PF strength*
no significant bony alignment or abnormalities of foot
post adjustability
which AFO design option accommodates a PF contracture
custom carbon pre-peg
advanced ankle AFO (multifunction ankle)
requirements for advanced ankle AFO (multifunction ankle)
grade 3 or less PF strength*
post adjustability
why would you choose a custom carbon pre-preg vs an advanced ankle AFO
pre-peg: only minimal foot abnormalities
advanced: accommodates very complex alignment or bony foot abnormalities
which AFO designs are for mild to moderate activity? moderate to high activity levels?
mild to moderate: custom fit
moderate to high: carbon pre-peg & advanced ankle
what reinforces push off during gait?
COM over BOS at midstance
what passive force serves as energy conservation during gait?
GRF
PF contract against external moment at midstance
what are the 4 basic function necessary for normal gait that orthoses attempt to restore?
- WB stability
- stance limb progression
- shock absorption
- energy conservation
shock absorption is initiated by _____ redirecting the force to the ______ at ____ rocker
knee flexion
quads
heel rocker
what muscle slows tibial anterior progression?
soleus
what is key to controlling swing phase?
push off/3rd rocker
what can help maintain control if weakness is present?
sensation intact
UMN that control ____ cells determine what muscle are activated during gait
anterior horn cells
what is normal foot to floor angle?
25 deg
must have ____ (#) ____ points per force/lever arm
2 resistant points
(3 point system)
what is a normal shank to vertical ankle?
10 deg
if pt has a PF contracture, what can be added to ensure proper shank vertical ankle?
wedge
