Ottobock | 53
8.2 Movement patterns in basic mode (mode 1)
8.2.1 Standing
The standing position is stabilised through high dorsiflexion damping with ver
tical lower leg. Plantar flexion is damped only slightly in order to be able to pull
back the lower leg into neutral position for correction of standing position.
Coming to a stop with the prosthesis side after walking can lead to the knee
joint sinking in as a result of the ankle position during the rollover.
To restore a stable standing position, place the leg back under the body and
stretch the leg or put weight on the heel.
The relief function can be used when standing (see Page 56).
8.2.2 Walking
Initial attempts at walking with the prosthetic foot always require instruction by
trained, qualified personnel.
When walking, the damping of the dorsiflexion and plantar flexion is adapted
to the current walking phase, making a physiological gait possible.
Plantar flexion damping is increased during heel strike in order to provide sup
port for stance phase flexion in the knee.
By increasing dorsiflexion damping in the stance phase, the lower leg is led
into an extended rollover angle. The rollover behaviour automatically adjusts
itself to the walking speed.
Plantar flexion damping is increased during the transition to the swing phase
in order to prevent the toes from dropping and to maintain ground clearance.
During the swing phase, plantar flexion damping is adjusted to the current
position of the lower leg at all times. This ensures a comfortable tread, with
suitable heel leverage for the respective step length.
Plantar flexion damping is reduced at the end of the swing phase at heel strike
in order to enable a soft tread.
8.2.3 Sitting down
Sitting down
1) Place both feet side by side at the same level.
2) While sitting down, distribute weight evenly between both legs and use
armrests, if available.
3) Move the buttocks in the direction of the backrest and lean the upper body
forward.
8.2.4 Sitting
When weight is consistently placed on the heel without movement for more
than 2 seconds, the tip of the foot lowers to reach a more natural foot position.
In comparison to a prosthetic foot that cannot be adjusted automatically, this
results in a more even distribution of pressure between the residual limb and
the socket.
Possible applications include sitting with the heel in front of the knee axis,
standing while leaning against something, and standing on a downward slop
ing surface.