Össur PRO-FLEX XC TORSION, Instructions For Use Manual, Page: 7 / 98

7 PB
after contact with fresh water. Fresh water: Includes tap water. Excludes
salt and chlorinated water.
For a weatherproof system, weatherproof components must be selected
for use with the device.
BENCH ALIGNMENT (Figure 3)
• Fit foot with selected cover and shoe.
• Adjust to appropriate heel height (using the shoe).
• Ensure appropriate angles (flexion/extension and abduction/
adduction).
• Divide the foot cover into 3 equal portions.
• The load line should fall at the junction of the posterior and the
middle third portions as shown in figure 3.
• The 1/3 position is marked on the inside wall of the foot cover.
DYNAMIC ALIGNMENT
The heel stores energy after initial contact, slowly releasing it at mid-
stance. The forward momentum generated by this action results in the
toe being loaded for optimum energy release at terminal stance.
The heel-to-toe action can be influenced by:
• Anterior/posterior positioning of the foot
• Dorsi-plantarflexion
• Heel stiffness
HEEL STIFFNESS
Heel too soft
Symptoms
• Foot comes to a flat position too early (user feels they are sinking into
a hole).
• Extra energy required to climb up over the toe.
• Toe feels too stiff.
• Knee may hyperextend.
Actions
• Shift socket anterior (or foot posterior).
Heel too hard
Symptoms
• Rapid heel-to-toe movement.
• At initial contact the user has poor control of prosthesis.
• User feels minimal energy return.
• Knee may become unstable.
Actions
• Shift socket posterior (or foot anterior).
FOOT COVERS AND SPECTRA SOCKS (Figure 4)
• The device is designed to be used with a recommended foot cover
and Spectra sock.
• Use a shoehorn when fitting and removing foot covers to avoid
damage (Figure 4.1 and 4.2) .
• Ensure the device is placed completely into the foot cover when
fitting.