embreis Very Good Knee - Go!, Руководство пользователя

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2
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1
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Hip
2 3
Knee Ankle joint
Fig. 2: A vertical Hip-Knee-Ankle line is the preferred
alignment. A posteriorly placed hip/greater
trochanter is liable to make swing release
more difficult.
In case of a true flexion contracture, the flexion
must be accommodated from the hip, to
maintain hip-knee-ankle alignment. A heel strike
with a flexed knee must be avoided, to avoid a
‘double action’ in midstance. In case of such
problems, the following can be done:  shift the
socket forward,  shift the foot forward,  the
user to exercise a small amount of hip extension
to maintain extension of the knee. The VGK-GO!
is ideally built in vertical position. The distal
pyramid must be used for neutral axial alignment
only if body weight > 100kg.
2.2. Socket flexion
Socket flexion produced from tilting the socket
at the distal socket only results in the knee
centre to be anterior to the hip-ankle line.
This may result in a diminished or absent knee
extension moment in late stance, and may make
swing initiation difficult.