VS1 Senator
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Instructions for Use (R-720-074, Rev. K)
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Senator®
Instructions for Use
Product Number: VS1
Assembly
The Senator® foot module is pre-assembled consisting of a graphite component (keel),
Spectra™ sock, and foot shell. Rubber
stiffening bumpers
for increasing heel stiffness
are provided. After dynamic alignment, torque pyramid adjustment screws to the
manufacturer’s specifications. Secure pyramid adjustment screws with a thread locking
adhesive (i.e., Loctite 242).
Bench Alignment
Prior to donning the prosthesis:
• Plantarflex/Dorsiflexion foot to match the shoe heel height.
• Adduct/Abduct socket to provide appropriate frontal plane angle.
• Flex/Extend socket to provide appropriate sagittal plane angle.
• Move the socket linearly to ensure the weight line falls along the anterior edge of the
pylon (see illustration).
Dynamic Alignment
During
loading response
, the heel lever stores energy and releases it during
midstance
.
This action provides momentum for the keel to store energy and release it during
terminal
stance
. To optimize the heel to toe rollover motion, adjust the following variables:
• Anterior/posterior foot placement
• Dorsiflexion/plantarflexion
• Heel stiffness
Troubleshooting
Heel too soft
Symptoms
• Foot flat occurs too rapidly
• Toe feels excessively stiff
• Knee hyperextension
Solutions
• Shift socket anteriorly in relation to the foot
• Attach rubber
stiffening bumpers
Heel too hard
Symptoms
• Rapid knee flexion, instability
• Heel to toe progression to rapid
• Lack of energy return sensation
Solutions
• Shift socket posteriorly in relation to the foot
• Verify appropriate foot module category
Foot module too stiff
Symptoms
• Flat spot in rollover motion at slow cadences
Solutions
• Consider a lower category foot module
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