LE Orthotics --> part 2 (1) Flashcards
what must be addressed for those w/ knee weakness
stance phase and swing phase
stance phase –> knee weakness
quad weakness
quad weakness –> stance phase
knee instability at heel strike
weight acceptance during mid stance
knee instability at heel strike –> stance phase
GRF is posterior to the knee
eccentric contraction of the quads control movement
weight acceptance during midstance –> stance phase
there could be knee bucking at mid-stance
quads stabilize during mid-stance
soleus from below gives some control of knee extension
swing phase –> knee weakness
quad weakness and hamstring weakness
quad weakness –> swing phase
consistent knee flexion (60 degrees)
knee flexion (leg clearance) during swing
eccentric quads control motion
hamstring weakness –> swing phase
consistent knee extension in preparation for HS
why is control of the knee difficult
changes in walking speed
general description of KAFO
thigh shell
knee joint
calf/pre-tibial shell
closure (strap)
w/ or w/o articulated ankle
foot plate
foot and ankle components of KAFO
same as AFO
knee joint axes
single axis
polycentric/multi-axis
single axis –> knee joint
hinge
polycentric/multi-axis –> knee joint
changing axis
hard to align
what do all knee joints give
ML control
knee controls
free knee
offset knee joints
locks
adjustable locks
free knee
free flexion/extension to 0 degrees
used primarily for ML control